JPH03178202A - Dielectric filter device - Google Patents

Abstract

PURPOSE:To miniaturize the entire device by arranging a dielectric substrate having an inter-stage coupling capacitor means so as to be perpendicular to an open face of plural coaxial dielectric resonators provided in parallel with a lateral direction so as to sufficiently approach the dielectric base to the coaxial dielectric resonator group. CONSTITUTION:A dielectric base 51 supporting mechanically an end opposite to a center conductor connection terminal of a rod member 52 is provided so as to insert the rod conductor member 52 at once to each center conductor 14 of plural coaxial dielectric resonators 10 provided in parallel in a lateral direction while opening faces 12 are arranged. Moreover, an inter-stage coupling capacitor between plural dielectric resonators 10 is incorporated in advance onto the dielectric substrate 51. In such a case, a major face of the dielectric base 51 is formed to be perpendicular to an open face 12 of the coaxial dielectric resonators 10. Thus, the substrate 51 is arranged much closely to the open face 12 of the coaxial dielectric resonators 10 and the entire filter is miniaturized.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention provides a plurality of quarter-wavelength coaxial dielectric resonators,
Regarding dielectric filter devices that obtain the desired band pass filter characteristics by capacitive coupling, we particularly aim to improve the electrical characteristics and reduce the size, and if necessary, improve the structure for ease of assembly. This invention relates to improvements that may also result in simplification.

[Prior art] Fig. 7.8 shows a quarter wavelength coaxial dielectric resonator 10.
An example of a conventional structure of a dielectric filter device 2o is shown in which six dielectric filter devices 2o are used to obtain a six-stage microwave dielectric band pass filter characteristic as a whole.

The individual quarter-wavelength coaxial dielectric resonators 1o used in each stage are already very well known. Therefore, to briefly explain, this is a dielectric block 11 made of a rectangular parallelepiped material having as high a dielectric constant ε as possible, such as a suitable ceramic material, which is generally abbreviated as a ceramic filter. have. In fact, ceramic materials with a dielectric constant ε of about 90 can be easily manufactured by hand.

Since the dielectric block 11 is an elongated rectangular parallelepiped, that is, a hexahedron, as described above, it naturally has six surfaces in total. Except for one end face 12, all of the other five surfaces are typically vapor deposited or coated over their entire surface with a suitable metallic or conductive material, such as silver or aluminium. Therefore, in particular, in the figure, the dielectric block 11
The exposed axial end surface 12 is also commonly referred to as an "open surface."

The length of the dielectric block 11 in the axial direction is a quarter wavelength of the frequency used, and a through hole 14 extending in the axial direction is also bored inside the block. A conductive material is also attached to the inner wall surface in the same manner as above.

As a result, the conductive layer applied to the inner wall surface of this through hole 14 constitutes a hollow pipe-shaped central conductor, and the conductive layer applied to the four surfaces extending parallel to the central conductor (also designated by reference numeral 14) While the conductive layer 13 serves as an outer conductor, the conductive layer attached to the axial end face, which is hidden in FIG. Therefore, such a structure is a dielectric coaxial line with a center conductor of quarter wavelength length, open at one end and short-circuited at the other end, and has an LC parallel resonance function. It can be used as a single wavelength coaxial dielectric resonator 10.

Note that although the conductive layer 13 is shown as having a metallic luster in the drawing, it may have a rough surface or a diffusely reflecting surface especially when it is formed by vapor deposition.

However, when trying to obtain good band pass filter characteristics in the microwave band, for example, it is also possible to construct a multistage filter circuit by capacitively coupling a plurality of such coaxial dielectric resonators 10 in a cascade. Although often practiced, in the early days the assembly of these devices was entirely manual.

In other words, an axial type or lateral type capacitor is prepared as a separate component as a capacitive coupling means between stages, and one lead wire of the capacitor is connected between adjacent coaxial dielectric resonators 10 and 10. The other lead wire is soldered to the open end of the center conductor 14 of the coaxial dielectric resonator 10, and the other lead wire is connected to the center conductor 14 of the adjacent coaxial dielectric resonator 10.
Repeat the process of soldering to the open end of the
Similar soldering is performed between each of the pair of terminals for connection with an external circuit and the center conductor of each coaxial dielectric resonator located at both ends in the parallel direction using capacitors, which are individual components. was processing.

However, in such a classical method, it is extremely time-consuming to manually insert and solder the lead ends of each pair of capacitors into the center conductor 14 of each dielectric resonator. It was not possible to expect any improvement in productivity, and it was not possible to guarantee the uniformity of the electrical characteristics of the filter.

Therefore, as a next means, a device structure as shown in FIG. 7.8 has been considered, and in fact, until now, such a structure has been considered relatively desirable in terms of assembly.

To explain, in the case shown, there are six coaxial dielectric resonators (
(hereinafter sometimes referred to as dielectric resonators or simply resonators) 10 are used, and these are arranged in parallel so as to be in contact with each other along one horizontal direction, and in this state,
Although not shown, they are electrically and mechanically fixed to each other by solder or the like.

In FIG. 7, above the group of such dielectric resonators lO are the open surfaces 12. of the dielectric resonators arranged in parallel.・・・
An elongated plate-shaped dielectric substrate 31 having a length in the juxtaposition direction is shown so as to cover all of the dielectric substrates 31. body resonator lO
is arranged in a parallel relationship with the open surface 12 of.

On one main surface of the dielectric substrate 31, for example, the main surface visible in FIG.
．． ... are patterned in this case along the direction in which the dielectric resonators 10 are arranged side by side, and are bent at both ends of the dielectric substrate 31 so as to be perpendicular to the direction in which the resonators are arranged side by side. A pair of conductive patterns 34, 34 are also patterned on the portions, respectively.

Six conductive patterns 33 patterned in the direction in which the resonators are arranged in parallel. . . . In a certain part, a conductive pin 32 . ... extend through the dielectric substrate 31 in a relationship perpendicular to the main surface, and these conductive bottles 32 . . . . each dielectric resonator 10 in order to constitute an excitation electrode of each dielectric resonator 10.
It is designed to be inserted into the hollow pipe-shaped center conductor 14 of O. After insertion, although not shown, the electrical connection between each center conductor 14 and each conductive bottle 32, as well as each conductive pattern 33, is ensured by soldering or the like.

On the other hand, each conductive bottle 32 is on the dielectric substrate 31.
．． Each conductive pattern 33. ...
There is a chip capacitor 3 between the adjacent ones.
5, . . . are provided, whereby the adjacent dielectric resonators 10,
10 are capacitively coupled.

Each of the conductive patterns 34 , 34 provided in a pair at both ends on the dielectric substrate 31 also has the conductive pattern 32 described above.
．． Conductive bottle 35°3 rising in the opposite direction to...
5 is provided at one end by being soldered to each of the conductive patterns 34 , 34 , and each of the conductive patterns 34 is
, 34 and the above conductive pattern 33 adjacent thereto.
, 33, the chip capacitor 37°37
is installed.

Therefore, after completing the above assembly, a circuit as shown in FIG. 6 is realized. Although FIG. 6 is used as a circuit for an embodiment of the present invention to be described later, for ease of understanding, the equivalent circuit diagram is shown below.
Each component or component described so far has its code written in a corresponding portion in the equivalent circuit.

As is clear, the coaxial dielectric resonator 10 shown in FIG. 7 corresponds to the LC parallel resonant circuit 10 shown surrounded by a phantom line in FIG.・・・
... is connected to a common line 13, and as described above, this line 13 corresponds to the outer conductor 13 of each dielectric resonator that is electrically connected to each other by solder or the like.

On the other hand, the other end of each LC parallel resonant circuit 10 is connected to each conductive bottle 3.
2. . . - via lines 32 corresponding to chip capacitors 36 . -... is connected to each end of the interstage coupling capacitor CC corresponding to.

Further, each conductive bottle 35, 35 provided at both ends of the dielectric substrate 31 connects the dielectric resonator 10, which is arranged in parallel. . . . are connected to each of the central conductors at both ends of the circuit through a coupling capacitor c0 constituted by chip capacitors 37 and 37 in FIG.

Therefore, if one of the pair of terminals 3535 is used as an input terminal for a microwave signal, the other can be used as an output terminal. body filter device 20
can be incorporated into an external circuit.

That is, once the dielectric filter device 20 shown in FIG. 7, which is shown in an unassembled or disassembled state, has been assembled and completed according to the above explanation, just turn it upside down and connect the appropriate circuit ( A conductive pin 35° 35 for connection to an external circuit is inserted into a through hole drilled in a circuit board 41 on which a circuit board (not shown) is constructed, and conductive patterns 42, 42 on the circuit board side provided therein are inserted. It is soldered to.

However, if it is difficult to mechanically support the dielectric filter device 20 on the circuit board 41 with only such soldering, apart from the electrical connection, if it is difficult to mechanically support the dielectric filter device 20 on the circuit board 41, it may be necessary to A method of using a conductive electromagnetic shielding box that covers the entire dielectric filter device 20 and fixing this Nla shielding box on a circuit board is also adopted. This point is also recognized in the embodiments of the present invention to be described later, so it will be explained there.

[Problems to be Solved by the Invention] The dielectric filter device 20 as shown in Fig. 7.8 existed before that, and the groin coupling capacitor and the human output coupling capacitor were installed one by one by hand. Considering this, mounting of chip capacitors etc. is easy to automate, and for each corresponding dielectric resonator center conductor,
Conductive pins 32. Since the work of inserting ... can be done all at once, work efficiency has been greatly improved. Installation on a circuit board is also relatively easy.

However, the first problem I would like to address is that in such a conventional structure, as shown in FIG. Dimension S
This means that the electrical filter characteristics change depending on the

That is, in such a conventional structure, each conductive pattern 33 . . Conductive pattern 33. ...
Due to the influence of..., in some cases, the open surface 12 cannot be regarded as an electrically open surface, and may actually become a short circuit surface. Of course, if that happens,
The LC parallel resonance characteristic by the individual dielectric resonators 10 as shown in FIG. 6 cannot be obtained.

This is not an extreme case, but even within a range where the LC parallel resonance characteristics can be satisfied, the conductive patterns 33. . . . When the distance S between the two filters is changed, the electrical filter characteristics are directly affected and often deviate from the designed or expected characteristics. On the other hand, in order to maintain the design characteristics, the distance S must be made sufficiently large, which would violate the demand for miniaturization of this type of filter device.

The present invention is first aimed at improving this point, and even if a member with a conductive pattern provided on a dielectric substrate is adopted for the sake of structural simplicity and ease of assembly. To be able to sufficiently reduce the influence that the presence of the conductive pattern has on each dielectric resonator, in other words,
The main purpose of this invention is to provide a dielectric filter device having a structure that does not impair the resonance function expected of the dielectric resonator even if the dielectric substrate is placed quite close to the open surface of each dielectric resonator. In addition to this main purpose, the present invention also aims to provide a structure that can further simplify the conventional structure.

[Means for Solving the Problems] In order to achieve the above object, the present invention first includes the following constituent feature groups ■ to ■ as the most basic invention.
We propose a dielectric filter device consisting of the following.

(2): A plurality of quarter-wavelength coaxial dielectric resonators arranged in parallel in one direction perpendicular to the axial direction, with the open surfaces on one end side in the axial direction aligned in the same direction.

■-It has a length along the direction in which the plurality of coaxial dielectric resonators are arranged side by side, and its main surface is substantially perpendicular to the open surface of the coaxial dielectric resonators. A dielectric substrate placed in relationship.

(2) A plurality of patterns are formed on the main surface of the dielectric substrate, the same number as the coaxial dielectric resonators arranged in parallel, spaced apart from each other so as not to make electrical contact with each other. conductive pattern.

(2) A capacitor means provided on the dielectric substrate for capacitively coupling adjacent conductive patterns.

■: One end thereof is electrically connected to each of the plurality of conductive patterns, and extends from the one end in parallel to the main surface of the dielectric substrate, and is inside the center conductor of each of the coaxial dielectric resonators. a plurality of bar-shaped electrically conductive members that fit into the center conductor and terminate at opposite ends in electrical contact with the center conductor;

Regarding the dielectric substrate in configuration requirement (3) above, "substantially perpendicular" to the main surface of the dielectric substrate or the open surface of the coaxial dielectric resonator means that it is arranged so as to remain perpendicular without being intentionally tilted. This term also includes the case where the angle between the open surface of the dielectric resonator and the dielectric substrate is not completely 90 degrees and has a slight error.In short, it is intended to be perpendicular. It would be good if it was placed as follows.

However, according to the present invention, regarding the plurality of conductive patterns in the above-mentioned configuration requirement (2), adjacent ones along the direction in which the dielectric resonators are arranged are alternately placed on one of the front and back surfaces of the dielectric substrate. A case is proposed in which the dielectric substrate is provided and patterned to have portions that overlap each other when viewed in the thickness direction of the dielectric substrate.

In such a case, the above-mentioned distance between the adjacent conductive patterns is the thickness of the dielectric substrate sandwiched between the conductive patterns, but As a result, the capacitor means specified in the above-mentioned configuration requirement A capacitor can be constructed using a portion of the dielectric material sandwiched between the capacitor electrodes as a dielectric layer between capacitor electrodes, and chip capacitors and the like as individual components can be made unnecessary.

Similarly, without using chip capacitors, which are individual components,
According to the present invention, other structures can be proposed to effectively utilize the conductive pattern and the dielectric substrate to configure the crotch capacitive coupling capacitor.

In other words, even if the plurality of conductive patterns are patterned along the direction in which the dielectric resonators are arranged side by side, and are patterned so that they are all provided only on one of the main surfaces of the front and back surfaces of the dielectric substrate, their adjacent By appropriately setting the spacing between the conductive patterns, the capacitor means in configuration requirement It is possible to construct a capacitor in which the capacitor electrode is a capacitor electrode, and the spaced portion is a dielectric region between the capacitor electrodes.

Furthermore, this can also be applied to the case where a conductive terminal member for connection with an external circuit is provided on the dielectric substrate.

In other words, among the plurality of conductive patterns described above, for the conductive patterns located at both ends in the juxtaposed direction, auxiliary conductive patterns opposing them at intervals are patterned on the dielectric substrate, and the A capacitor means is provided for capacitively coupling between each of the pair of auxiliary conductive patterns and the conductive pattern adjacent to each of the auxiliary conductive patterns, and one end thereof is electrically (connected) to each of the auxiliary conductive patterns. , if a conductive terminal member for external circuit connection is provided with the other end extending outward from the dielectric substrate, and one of the pair of external circuit connection terminal members is used as an input terminal for a microwave signal, the other can be used as an output terminal, but regarding the coupling capacitor means between this auxiliary conductive pattern and the adjacent conductive pattern, each of the above-mentioned interstage coupling capacitors between the plurality of conductive patterns can be used. configuration can be applied.

For example, by providing an auxiliary conductive pattern and an adjacent conductive pattern on one of the front and back surfaces of the dielectric substrate, a butterfly pattern is formed so that the MMN body substrate has an overlapping portion when viewed in the direction toward the substrate. If so, it is possible to obtain a coupling capacitor in which the mutually overlapping parts are respectively capacitor terminal electrodes, and the part of the dielectric between them is an interelectrode dielectric layer, and the auxiliary conductive pattern and the adjacent conductive pattern are Even if patterns and patterns are formed together on one main surface of a dielectric substrate, by appropriately setting the interval between them, the adjacent parts can be used as capacitor electrodes, and the interval can be used as an interelectrode dielectric area. A coupling capacitor can be obtained.

On the other hand, regarding the rod-shaped conductive member according to the above configuration requirement (2) that connects each conductive pattern on the dielectric substrate and the center conductor of the dielectric resonator, in the present invention, as the simplest configuration,
A dielectric rod-shaped portion that is part of the dielectric substrate and protrudes into a narrow plate shape that fits into the hollow center conductor of the coaxial dielectric resonator in the axial direction, and a plurality of dielectric rod-shaped portions that are located on this dielectric rod-shaped portion We also propose a structure in which this bar-shaped conductive member is formed by corresponding conductive patterns and a conductive layer patterned in series.

And, in exactly the same way, the conductive terminal member for external circuit connection described above is also a dielectric rod-shaped portion that is a part of the dielectric substrate and protrudes in a direction other than the direction toward the coaxial dielectric resonator. We also propose a structure in which a conductive terminal member for external circuit connection is formed by a conductive layer formed on the dielectric rod-shaped portion and patterned in series with corresponding ones of the pair of auxiliary conductive patterns.

[Function] According to the present invention, a rod-shaped conductive member can be inserted all at once into the center conductor of each of a plurality of coaxial dielectric resonators arranged side by side in one horizontal direction with their open surfaces aligned. , a dielectric substrate is provided that mechanically supports the end of the rod-shaped member opposite to the center conductor connection end, and an interstage capacitance between the plurality of dielectric resonators is also provided on the dielectric substrate. Even if the dielectric filter device is simplified in assembly by pre-installing the coupling capacitor, the disadvantages that have been recognized in the past do not occur.

That is, as mentioned above, one end of the rod-shaped conductive member is inserted into the center conductor of each coaxial dielectric resonator, and the other end of the rod-shaped conductive member is connected to each electrode of the capacitor provided in advance on the dielectric substrate. , even if it is necessary to form a plurality of conductive patterns on the dielectric substrate, and also,
Even if the area of these conductive patterns becomes considerably large, in the present invention, the main surface of the dielectric substrate is intentionally configured to be perpendicular to the open surface of the coaxial dielectric resonator, so that the dielectric substrate can be Even when placed close to each open surface of a coaxial dielectric resonator, the conductive patterns provided on the main surface of the dielectric substrate do not affect each coaxial dielectric resonator electrically. can be eliminated, or at least the extent of its influence can be greatly reduced.

In other words, the inconvenience that the filter characteristics to be obtained will deviate greatly from the design characteristics due to the presence of the dielectric substrate having the conductive pattern is eliminated, and there is a wide degree of design freedom regarding the spatial position occupied by the dielectric substrate relative to the coaxial dielectric resonator. is born.

Therefore, for the open surface of the coaxial dielectric resonator,
Since it is also possible to arrange the dielectric substrates fairly close together, it is also possible to downsize the entire device.

In the dielectric filter device of the present invention, which can achieve the above-mentioned significant effects even if it follows the most basic configuration, the above-mentioned conductive material is further provided on both the front and back main surfaces of the dielectric substrate, according to another aspect of the present invention. Form patterns alternately,
Alternatively, in a structure in which each of the conductive patterns and the dielectric substrate itself are used to form an interstage capacitive coupling capacitor by facing each other at an appropriate interval even on the main surface, it is naturally necessary to Individual parts such as chip capacitors, etc., that were previously used are no longer necessary, and manufacturing and assembly are significantly simplified.

The capacitance value of the coupling capacitor to be obtained can be set to a desired value depending on the area of each conductive pattern and the spacing between adjacent conductive patterns in the thickness direction or in-plane direction of the substrate, and can be made with high accuracy. It can be held and formed.

This is because the capacitance can be made to depend only on the patterning accuracy of the conductive pattern, which can be obtained with considerably high accuracy even with existing patterning devices.

In addition, since the dielectric substrate is erected with respect to the open surface of the coaxial dielectric resonator, when obtaining a capacitor of a desired value with a conductive pattern of a predetermined area in this way, the conductive pattern is Because it is easily accessible,
For example, even if a trimming operation such as removing a part of the area of the conductive pattern is performed in order to precisely match the capacitance value of the coupling capacitor at the final stage, there are no obstacles and it is easy. Of course, such an advantage is achieved by providing a pair of conductive terminal members for connecting an external circuit on the dielectric substrate, and connecting a coupling capacitor between each of these terminal members and an adjacent conductive pattern. The capacitor can also be obtained when the capacitor is formed by

Furthermore, according to the present invention, a rod-shaped conductive member that establishes an electrical connection between each of these conductive patterns on the dielectric substrate and the center conductor of each coaxial dielectric resonator is attached to a dielectric material formed integrally with the dielectric substrate. If the body is made up of a rod-shaped part and a conductive pattern patterned thereon, or if a similar structure is adopted for the terminal member for external circuit connection, the number of parts will be minimized and the structure will be improved. It is significantly simplified and assembly is also extremely easy. In this way, in practice,
By simply patterning a conductive pattern according to a predetermined pattern on a dielectric substrate of a predetermined shape, it is possible to create interstage coupling capacitors, coupling capacitors between terminal members, etc.
This is because the rod-shaped conductive member, external circuit connection terminal member, etc. that constitute the excitation electrode of each coaxial dielectric resonator can all be formed in one step and as a single component.

Regarding assembly, each dielectric bar protruding from the dielectric substrate is inserted into the hollow center conductor of each coaxial dielectric resonator, and the conductive pattern (excitation electrode) formed on the outer surface of the dielectric bar is inserted into the hollow center conductor of each coaxial dielectric resonator. If the pattern) is electrically connected to the center conductor of each coaxial dielectric resonator by soldering, etc.,
This makes it possible to realize cross-to-back capacitive coupling between multiple coaxial dielectric resonators installed in parallel, and also to connect the dielectric substrate and other dielectric bar-shaped parts that are also formed in series. Solder the wiring conductive pattern from (or to) the external circuit formed on the appropriate circuit board to the conductive pattern formed on the conductive terminal for external circuit connection. The present dielectric filter device can be easily incorporated into the external circuit by simply making an electrical connection.

In other words, according to the most basic configuration of the present invention, the main surface of the substrate is not parallel to each open surface of the coaxial MlJ electric resonator, but is intended to be perpendicular to each open surface of the coaxial MlJ electric resonator. Therefore, in the past, the conductive bottle that constitutes the excitation electrode and the conductive bottle that is the terminal member for connecting to the external circuit were made using separate parts so as to stand upright with respect to the dielectric substrate. However, this is no longer essential, and it is now possible to use a shape in which the rod-shaped dielectric portion protrudes parallel to the main surface of the substrate, as shown above. It is also an incidental result obtained for the sake of mutual understanding.

[Example] An example of a dielectric filter device configured according to the present invention will be described below, but the present invention is adopted for the components in the conventional example already explained with reference to Fig. 7.8. For components that do not require any particular changes,
The reference numerals used for the conventional example will be used as they are to refer to those components, and the description of each individual component will be omitted in this section by referring to what has already been explained.

Also in the dielectric filter device 50 of the present invention, as shown in FIG.
'The TMh body resonator lO is essential, and one end surface (open surface) in the axial direction where the material surface of the dielectric block 11 is exposed in each of them 12 faces the same direction (in the case shown, upward). However, the number itself is a matter of arbitrary design, and at least two is sufficient. In this embodiment, a case is illustrated in which coaxial dielectric resonators IO are cascaded in six stages to obtain desired band pass filter characteristics.

A total of six coaxial dielectric resonators 1 arranged in parallel in one direction
0. Open surface 12. At the top of...
In FIG. 1, a rectangular dielectric substrate 51 is shown which has a length along the juxtaposed direction and whose main portion is elongated except for respective protruding portions 51-+, 51-2, and 51-3, which will be described later. ing.

The material of the dielectric substrate 51 is arbitrary, and may be one that is normally used as a substrate material for printed wiring boards, etc., but in the present applicant's practical example, the dielectric constant A Teflon plate material with a resistance of about 2.6 is used. Such Teflon substrates are also readily available on the market.

The main portion of the dielectric substrate 51 has a rectangular geometric shape as described above, or in the case of this embodiment, each coaxial dielectric resonator 10. Each center conductor 14 of...
The excitation electrode electrically connected to ... is also shown to be manufactured integrally with this dielectric substrate 51 and each conductive pattern 52 described below, so it is formed into a narrow plate shape from the upper part. It has a protruding rod-shaped portion 51-1, and there are six dielectric rod-shaped portions 51-1 in total corresponding to the position of the center conductor 14 of each coaxial dielectric resonator.

On the other hand, in this embodiment, the terminal member for electrically connecting the dielectric filter device 50 to an external circuit (not shown) also utilizes a dielectric substrate material portion and a conductive pattern formed thereon. Therefore, at each longitudinal end of a portion of the main dielectric, a second dielectric rod portion 51-2, which is also a narrow plate, is connected to the first dielectric rod portion 51-1. are provided so as to protrude in the opposite direction.

Furthermore, although this may be provided as required, when this device is assembled as described later, the coaxial dielectric resonators 10 with the dielectric substrates 51 arranged in parallel in one direction
．． Tongue member 5L3.51 protrudes in the same direction as the first dielectric rod-shaped portion 51-1 protrudes so as to sandwich and stabilize the groups of... from both sides.
-s are provided, one at each end of a portion of the main dielectric.

Of course, these first and second dielectric rod-shaped portions 51-,
, 51-2 and the tongue member 51-3 can be easily obtained by cutting out the main elongated portion of the dielectric substrate 51 in the same process, or by press punching. In other words,
In this embodiment, all the shaped parts required for the dielectric substrate 51 have their main surfaces on the same plane.
This is a major reason why the entire structure, including the protruding parts, can be completed in a simple molding process as described above. In special cases, if the dielectric substrate 51 is required to have a higher dielectric constant, it is possible to configure the dielectric substrate 51 with a suitable ceramic. The outer diameter shape of the dielectric substrate 51, including the protruding portion, is determined by the casting shape of the sintering mold used.

First dielectric rod-shaped portion 5! , . . . as mentioned above, each coaxial dielectric resonator 10. Each center conductor 14. ... Since it is inserted into a hollow part, its width is naturally the same as that of the hollow center conductor 14. The width must be smaller than the inner diameter of the . This is because the conductive pattern 52-4, which functions as an excitation electrode for each coaxial dielectric resonator 10, is attached to the outer surface of the dielectric rod-shaped portion 51-1.
is formed by patterning, and with the above dimensional relationship, the rod-shaped dielectric portions St-,
When placed inside, the conductive pattern 52-4 formed on the rod-shaped dielectric portion 51-1 can temporarily be in electrical contact with each center conductor 14, and then, Although not shown in the drawings, if soldering or the like is applied between these, good low impedance ohmic contact can be ensured between the two.

However, regarding each shape of the conductive pattern 52 on the dielectric substrate 51 adopted in this embodiment, a more detailed explanation will be given with reference to FIG. 3, which shows only the dielectric substrate 51 in an enlarged manner. In FIG. 3, the front and back principal surfaces of the dielectric substrate 51 used in this embodiment are shown upside down.

The side surface shown in the lower part of FIG. 3 corresponds to the side surface visible in FIG. A total of three first dielectric rod-shaped portions 5 every other time including one of the first dielectric rod-shaped portions 5
A conductive pattern 52-4 is patterned on the main surface of each rod-shaped portion 51-I, extending to both edges and the free end of the tip, and the end opposite to the free end of the dielectric substrate 51 is They also extend on the main surface of the main portion, and are connected to conductive pattern portions 52-3, each of which is a narrow line pattern extending a short distance in the length direction of the dielectric substrate.

At both lengthwise ends of this narrow line-shaped pattern portion 52-1, there are provided conductive pattern portions 511 and 52-2, which are approximately rectangular and each have a fairly large area, but these will be described later. As can be understood from the above, the electrode patterns of the capacitor are 5Ll and 52-2. In addition, the narrow line-shaped pattern portion 52-3 between the electrode patterns described above is connected to each capacitor electrode pattern 5.
This is an intermediate connection pattern that establishes an electrical connection between Ll, 5L2 and the conductive pattern 52-4 on the first dielectric bar-shaped portion 51-1, which becomes each excitation electrode pattern.

On the other hand, when looking at the upper part of FIG. 3, the conductive pattern configuration on one side of the dielectric substrate 51 explained above for the lower part side is as follows.
On the other side, they are patterned in exactly the same geometrical shape, although they are shifted by one coaxial dielectric resonator in the right direction.

That is, on the main surface of every other three first dielectric rod-shaped portions 51-1 including the second one from the left, both edges and the free end of each rod-shaped portion 51-1 are provided. A conductive pattern 52-4 is patterned, and the end opposite to the free end of the dielectric substrate 51 extends over the main surface of the main portion of the dielectric substrate 51. It is connected to the conductive pattern portion 52-3, which is a narrow line pattern extending over a distance, and the narrow line-like pattern portion 52-3 has a substantially rectangular shape at each end in the length direction. A conductive pattern portion SL, , 52-2 having a large diameter is provided.

Therefore, each conductive pattern portion 5L+
, 52-2, 52-3, and 52-4 are alternately provided on both the front and back surfaces of the dielectric substrate 51 in this embodiment. However, more characteristically, the adjacent conductive patterns 52 , 52 , that is, the adjacent conductive patterns 52 , 52 , one of which is formed on one main surface of the dielectric substrate 51 and the other is formed on the other main surface of the dielectric substrate 51 , 52 are provided at positions where adjacent conductive pattern portions with large areas overlap each other when viewed in the thickness direction of the dielectric substrate 51.

That is, the large-area pattern portion 52-2 on the right side of each conductive pattern 52 on the main surface shown in the lower part of FIG. Large-area pattern portion 52- on the left side of the conductive pattern 52
1, the conductive patterns 52 are patterned at positions exactly opposite to each other across the thickness of the substrate 51, and in exactly the same way, the large right side of each conductive pattern 52 on the main surface of the side shown in the upper row of FIG. The area pattern portion 52-2 is located on the main surface of the side shown in the lower part of FIG.
The pattern is formed at a position exactly opposite to the left large area pattern portion 52-1 with the thickness of the substrate 51 in between.

Therefore, along the thickness direction of these substrates, the conductive patterns 52 face each other while keeping the thickness of the substrate as a separation distance.
-, , 5L, each function as an electrode pattern of a capacitor, and the pair of electrode patterns 5Lz,
A portion of the dielectric material sandwiched between the capacitors 52 and 52-+ functions as a dielectric layer between the terminal electrodes of this capacitor.

With such a conductive pattern configuration, the dielectric substrate 51
As shown by the imaginary line in FIG. 3, a total of six conductive patterns 52 are connected in cascade by the interstage coupling capacitor CC, while the conductive patterns 52 are used as they are as a component for forming each capacitor. As described above, each of the capacitor electrode patterns 52-+ and 52-2 is connected to the conductive pattern on the first dielectric bar-shaped portion 51-1 via the conductive pattern portion 52-3 for intermediate connection. 52-4 are electrically connected, and the conductive patterns 52-4 are connected to the corresponding coaxial dielectric resonator 10.・・・
... hollow center conductor 14. . . . and are electrically connected, it is possible to obtain a relationship in which the six coaxial dielectric resonators 10 are connected in a cascade by the interstage coupling capacitor CG.

Further, in this embodiment, the left large-area pattern portion 5z-2 of the conductive pattern 52 associated with the coaxial dielectric resonator 10 located at the leftmost end is one electrode of a capacitor for human power coupling or output coupling. functions to configure,
Large-area pattern portion 52-2 on the right side of the conductive pattern 52 related to the coaxial dielectric resonator lO located at the rightmost end
serves to constitute one electrode of a capacitor for output coupling or manual coupling.

That is, the large area pattern portion 5 on the left side of the conductive pattern located at the leftmost end on the main surface side shown in the lower part of FIG.
2-3, there is an auxiliary conductive pattern 5 of approximately the same area on the opposite side of the dielectric substrate 51 across the thickness thereof.
3-2 is formed by patterning, and from one edge of this auxiliary conductive pattern 53-1, a second dielectric rod-shaped portion 51-
2 to the free end of the conductive pattern 53-2.
It has a pattern that stretches.

In exactly the same way, with respect to the large-area pattern portion 52-2 on the right side of the conductive pattern located at the rightmost end on the main surface side shown in the upper part of FIG. An auxiliary conductive pattern 53-1 having approximately the same area is also patterned at the opposing position as shown in the lower part of FIG. 3, and from one edge of this auxiliary conductive pattern 53-1, A pattern is provided in which a conductive pattern 53-2 extends along the dielectric rod-shaped portion 51-2 to its free end.

These pair of narrow conductive pattern portions 53-2, 53-
2, these narrow conductive pattern portions 53-25:12 and the coaxial dielectric resonator closest to them constitute a terminal electrode for connection with an external circuit (not shown). vessel 10, center conductor 14 of to
, 14 as well, the above-mentioned conductive pattern portion 53
- A capacitor C in which I and 52-1 or 53-1 and 53-2 are used as respective capacitor electrodes, and a part of the dielectric material sandwiched between them is used as the dielectric layer between the terminal electrodes.
0 is formed. This capacitor C8 for manual coupling or output coupling is also schematically shown in phantom lines in FIG.

Therefore, returning to FIG. 1, from the disassembled state in the drawing, the first dielectric rod-shaped portion 51-1 integrally provided on the dielectric substrate 51 is located at the hollow center of each coaxial dielectric resonator 10. It is assembled by inserting it into the conductor 14, and further, solder or the like (not shown) is applied between each center conductor 14 and the conductive pattern portion 52-4 which is formed by turning on the first bar-shaped portion. Applying this to ensure electrical contact between them results in an equivalent circuit as shown in FIG.

As was also the case in the previous explanation regarding the conventional example, this S6
In the drawings, parts corresponding to the respective constituent elements of the embodiment of the present invention shown in Figs. 1 and 3 are indicated by their respective symbols.

As is clear, one of the narrow conductive patterns 5L2.53-2 attached to the auxiliary conductive pattern 511.5Ll provided near both ends of the dielectric substrate 51 is used as the input terminal for the microwave of the frequency used, and the other If the output terminals are used as output terminals, a band pass filter circuit can be obtained in which six stages of LC resonance circuits 10 are connected in cascade between these output terminals.

In order to mount the present dielectric filter device 50 on the circuit board 41 having an external circuit, a mounting structure as shown in FIGS. 1 and 2, for example, can be adopted.

The dielectric substrate 51 has conductive patterns 53-2 at both lengthwise ends thereof, which protrude in a direction opposite to the direction toward the coaxial dielectric resonator IO and serve as conductive terminal members for external circuit connection. Since a pair of dielectric bar-shaped portions 5L2 and 51-2 are provided with patterning of 5L2,
As shown in FIG. 2, the present dielectric filter device 5
If a through hole is drilled in advance in the circuit board 41 which mechanically supports the 0 and mounts an appropriate external circuit (not shown), through which the pair of dielectric bar-shaped portions 512 and 512 pass, Coaxial dielectric resonator l according to the procedure
After assembling the O group and the dielectric substrate 51, the coaxial dielectric resonator group is turned upside down by 180 degrees from the posture shown in the first figure, and the dielectric rod-shaped portions 5i-2 and 5t-2 are connected to the circuit. By fitting into each through hole of the substrate 41, the dielectric filter device 50 can be held in an upright state on the circuit board 41.

And each M'A M plate rod-shaped portion 51-2, 51-2
The conductive patterns 5L2 and 53-2 as terminal members for external circuit connection formed by patterning on the wiring pattern 42 from the external circuit (or to the external circuit) extended to the periphery of the through hole. , 42, by electrically connecting them with solders 43, 43, etc., electrical connection between the intended external circuit and the dielectric filter device 50 can be easily achieved. It is also possible to increase the physical supporting force of the dielectric filter device 50 by increasing the adhesion force.

Furthermore, it is generally desirable for this type of dielectric filter device to be protected from external electromagnetic waves, so for example, as shown in Figure 1, only one surface, which is the top plate surface or bottom plate surface, is open and the other surface is closed. A suitable metal box 61 is prepared, and coaxial dielectric resonators 10. . . . and the MW fa body substrate 51 assembled by the above procedure may be stored therein.

In this case, the dimensions of the box 61 are as follows: coaxial dielectric resonators 10. . . , and its depth is such that only the second dielectric bar-shaped portion 51-2, which constitutes the terminal member for connection with an external circuit, is in the box. A plurality of tongues 62.61 are preferably selected to protrude to the outside of the box 61 and, in particular, as shown, are foldable at appropriate intervals along the open edge of the box 61. ... is also provided.

Therefore, after placing the present filter device 50 in the box 61, the box 61 is turned over 1800 degrees from the state shown in the first figure so that the open surface becomes the bottom surface, and the rod-shaped portion of the dielectric substrate 51 is turned over as described above. 51-2, 512 to the circuit board 41
Although not shown in FIG. 2, each tongue piece 62 provided at the open edge of the box 61 will be inserted into each of the through holes. If the tongue piece 62. is placed so as to fit into the elongated hole provided in the portion corresponding to the circuit board 41, the tongue piece 62. . The housed dielectric filter device can also be mechanically fixed.

Furthermore, the folded tongue piece 62. If at least one of the above is placed in contact with a ground pattern (not shown) patterned on the circuit board 41, by soldering between them, The metal box 61 can be connected to ground potential, so that the box 61 can be connected to the present dielectric filter device 50.
It can be used as an electromagnetic shielding box.

Of course, the coaxial dielectric resonator 10. which becomes a common line in the equidiscretion path shown in FIG. 4 for external conductor configuration of...
Since the body layer 13 is in electrical contact with the inner wall surface of this electromagnetic shielding box 61, the circuit board 4! If any one of the tongues 62 is electrically conductive to the ground pattern above, this will cause the common line 1
3 can also be connected to the reference potential, that is, the ground potential, through the electromagnetic shielding box 61 without the need for drawing out a special terminal or the like.

In FIG. 2, dielectric cut members 51-3, 51-3 provided at both ends of the dielectric substrate 51 form a coaxial dielectric resonator 10. It is also shown that the group of ... is sandwiched from both sides.

However, after the dielectric filter device 50 is mounted on the circuit board 41 as described above, the tongue member 51
-3.51-3 does not have any particularly significant function,
Rather, this tongue piece member 51-3 is attached to each coaxial dielectric resonator 10 until the wood filter device 50 is placed in the box 61, or in a process slightly earlier than that.・
Center conductor 14 of... . . ., the MME body substrate dielectric rod-shaped portion 51-. ．． ...Top conductive pattern 5L4. When soldering...
It can be conveniently used to temporarily hold the dielectric substrate 51 against a group of coaxial dielectric resonators.

The dielectric substrate 51 used in the above embodiments makes effective use of its ambidextrous surface and also uses its own thickness to form a coupling capacitor. It is also possible to adopt a configuration in which a conductive pattern is provided only on one main surface of the substrate.

FIG. 4 shows an embodiment in such a case, and the illustrated dielectric substrate 51 can be used in place of the dielectric substrate 51 shown in FIGS. 1 to 3.

The external shape of the dielectric substrate 51 itself may be exactly the same as that shown in FIG. 3, and corresponding components will be described with the same reference numerals. number 1 first dielectric rod-shaped portion 51. , . . . second dielectric bar-shaped portions 52-2 located at both ends of the dielectric substrate 51 and protruding in the opposite direction, and the dielectric substrate 51 to the coaxial dielectric resonator group. A pair of tongue pieces 5t-8 and 5L3 are provided which are convenient for temporary holding.

However, the center conductor 14 of each coaxial dielectric resonator IO,
The conductive pattern portions 52-4 electrically connected to the conductive pattern portions 52-4 are all patterned on the main surface of each rod-shaped portion 51-1 on the one main surface side of the dielectric substrate 51. This conductive pattern portion 5L4. The end sides opposite to the tips of . The conductive pattern portion 52-1 has a large area.

In the illustrated case, the large area portion 52-1 on the left side and the large area portion 52-2 on the right side of each conductive pattern 52 are located on the main surface of the main portion of the dielectric substrate 51 in the height direction (coaxial type dielectric Between the pair of adjacent conductive patterns 52, 52, the large-area conductive pattern portion 52-2 on the right side of the left conductive pattern 52 is shifted in the same direction as the axial direction of the resonator.
is adjacent to the left large-area conductive pattern portion 51-1 of the right-adjacent conductive pattern 52 with a slight interval therebetween in the height direction.

Therefore, the right large area conductive pattern portion 52-2 in the left conductive pattern 52 and the left large area conductive pattern portion 52-0 in the conductive pattern 52 located on the right side each serve as a capacitor electrode, A capacitor CC is constructed in which the space between them is used as a dielectric region between capacitor electrodes. Regarding this capacitor CC, as before,
Although it is shown by a temporary line in FIG. 4, the material of the dielectric substrate under the space between the pair of capacitor electrode patterns 5Ll and 5L2 also has a ratio of MN ratio of the capacitor CC. Affects capacitance value. Therefore, depending on the capacity required for the capacitor C9, the spacing between both capacitor electrodes as well as the material of the substrate to be used can be included in the design factors. As mentioned earlier, it is also possible to use a ceramic substrate, etc., if necessary.

However, among the adjacent conductive patterns 52, 52, large-area pattern portions located on the same side, such as pattern portions 511.5LI or 52-2 and 52-2, should not have significant capacitive coupling with each other. It is desirable to provide sufficient lateral spacing.

In the embodiment shown in the fourth figure, a conductive pattern portion 53-2 as a four-port terminal member for external circuit connection is also formed on the same main surface of the dielectric substrate 51, and an auxiliary conductive pattern connected thereto is formed on the same main surface of the dielectric substrate 51. 5L, 5L are also adjacent conductive patterns 52, first large-area conductive pattern portions 51-3 of 52
Or, since it is adjacent to the second large-area conductive pattern portion 5z-2 in the height direction with a short interval, there is also space between them for manual coupling or output, as shown by the imaginary line in the figure. A coupling capacitor C0 can be formed.

In this fourth illustrated embodiment, the intermediate connection portion 52-3 in the conductive pattern 5z shown in the third illustrated embodiment is
Conductive pattern portion 52-4 whose tip is generally a free end
It can be considered that it is near the other end of the board side.
The equal deflection path of the present dielectric filter device using the dielectric substrate configuration shown in FIG. 4 is approximately as shown in FIG. It can be expressed as is.

As in the above embodiment, each functional part, including the capacitors C0 and Cc for input/output coupling and crotch coupling, is formed by patterning a conductive material on one dielectric substrate 51 of a predetermined shape. As is clear, it consists of
Extremely advantageous results can be obtained in terms of manufacturing and cost. The dielectric substrate 51 is essentially the only individual component that must be assembled into the group of coaxial dielectric resonators arranged in parallel, and the assembly operator only needs to handle this dielectric substrate 51.

Further, as an additional effect, trimming of the capacitance value of each capacitor CC+co is easy.

The capacitance value of each capacitor Cc, C, is determined by the conductive pattern portion SL serving as the capacitor electrode.

5L2.5: Since it can be made to depend on the area of Ll, if the area is finely adjusted in the direction of reduction using a known existing trimming device such as a trimming device according to the sand blasting method or the abrasive method or a laser trimming device. , the capacitor capacitance can be precisely adjusted to the desired value. If too much is removed, it can be corrected by attaching a solder layer or the like as appropriate, for example.

Moreover, in the case of the present invention, the dielectric substrate 51 is connected to the open surface 12 of the coaxial dielectric resonator. Since the conductive pattern 52 is maintained in a substantially perpendicular relationship to the dielectric substrate 51, a relatively large capacitance can be obtained. Even when the conductive pattern 52 is provided on both main surfaces of the substrate, which is a desirable method, since both main surfaces of the substrate are exposed laterally outward, the trimming device can easily access either main surface. It is.

However, as mentioned above, the most fundamental object of the present invention is that when a dielectric filter device is constructed by using a dielectric substrate having a conductive pattern in combination with a group of coaxial dielectric resonators, the dielectric As already mentioned, the positional relationship between the body substrate and the coaxial dielectric resonator group is the key to sufficiently reducing the influence on the filter characteristics.
Dielectric substrate 5 having at least the conductive pattern 52
1 is a coaxial dielectric resonator 10. Open surface 12 of...
It would be good if you had a positive relationship with them.

Therefore, as long as the requirements are not met, a dielectric substrate 51 having a structure as shown in FIG. 5 can also be cited as another embodiment of the present invention.

That is, the conductive pattern portion 52-4 electrically connected to the center conductor 14 of each coaxial dielectric resonator is placed on the rod-shaped portion 51-1 protruding from the main narrow portion of the dielectric substrate 51. Although it is the same as the previous embodiments in that it is formed, only the enlarged intermediate connection conductive pattern portion 52-3 is provided at the other end of the conductive pattern 52-4, and there is no gap between the stages. Capacitive coupling is achieved by chip capacitors 54.5L3, each of which is an individual component in which each terminal portion is electrically and mechanically fixed on a pair of adjacent intermediate connection conductive pattern portions 5L3.5L3 by soldering or the like.
It is adopted by...

Similarly, conductive pattern portions 53-2, 53-2 functioning as input terminals or output terminals are connected to auxiliary conductive patterns 5L, SL, and conductive patterns 52. , 52 and intermediate connection conductive pattern portions 5L3.5L3 are similarly capacitively coupled by a chip capacitor 55. Of course, the chip capacitor 54 between stages is the interstage coupling capacitor Cc in the equivalent circuit shown in FIG. 6, and the chip capacitors 55 on the input and output sides are the capacitor C for manual coupling or output coupling
Corresponds to 0.

Furthermore, although not shown, as long as the most basic purpose of the present invention is achieved, each coaxial dielectric resonator 1
0. Each conductive pattern portion 52-4 constituting the excitation electrode may be replaced with a conductive bottle which is a separate component. In that case, one end of the conductive bottle is electrically and mechanically fixed to the intermediate connection conductive pattern portion 53-3 in the conductive pattern 52 by soldering, etc., and the other end of the conductive bottle is Each coaxial dielectric resonator 10. has a free end extending parallel to the main surface of the dielectric substrate 51 and perpendicular to the direction in which the coaxial dielectric resonators are arranged in parallel. ...
It suffices to fit it into the hollow center conductor 14 of...

Even in this case, assembly is much simpler than the conventional example shown in FIG. 78 described above. Even if a separate conductive bottle is used, it is not necessary to hold the bottle in a perpendicular relationship to the dielectric substrate 51, so there is no need to drill a through hole in the dielectric substrate in the thickness direction of the substrate. It is sufficient to simply place one end of the conductive bottle on the main surface of the substrate on the flat conductive pattern 52-3 and solder the end.

The same can be said of conductive terminal members for external circuit connection, and as in the illustrated embodiment, when patterning a conductive pattern 53-2 on a bar-shaped portion 51-2 provided on a dielectric substrate 51, Instead, a conductive bottle whose one end is electrically and mechanically fixed by soldering or other means to the auxiliary conductive pattern 53-1 formed on the main surface of the dielectric substrate is used, and the external circuit is connected to the tip of the conductive bottle. It's okay. The direction in which this external circuit connection terminal member extends may be any direction as long as it does not interfere with the group of coaxial dielectric resonators IO.

The embodiments of the dielectric filter device constructed according to the present invention have been described above, giving examples in which various types of dielectric substrates 51 constructed according to the present invention can be used depending on the differences in the shape of the conductive patterns. However, other patterning shapes than those shown can be arbitrarily designed without departing from the spirit of the present invention.

[Effect] According to the present invention, the dielectric substrate having the groin coupling capacitor means is intentionally perpendicular to the open surface of the plurality of coaxial dielectric resonators arranged in one horizontal direction. Therefore, one or more conductive pattern parts with a fairly large area may be required on the dielectric substrate in response to some request, such as for forming a capacitor or at least for convenience of wiring. Even if there is a problem, the relative axial positional relationship of the dielectric substrate to the coaxial dielectric resonator will not have a significant effect on the electrical characteristics of the coaxial dielectric resonator. It is possible to obtain filter characteristics exactly as designed.

Therefore, in other words, the dielectric substrate can be brought sufficiently closer to the coaxial dielectric resonator group than in the conventional example, contributing to miniaturization of the entire device.

Furthermore, according to another aspect of the present invention, while satisfying the above effects, the area of the conductive pattern formed on the dielectric substrate is If the capacitor is constructed in accordance with the above arrangement, the capacitor as an individual component is essentially not required, and not only is manufacturing extremely convenient, but the labor required for assembly by the operator is greatly reduced, and productivity is significantly improved. Differences in characteristics between products can also be minimized, and naturally, improved productivity also contributes to lower product costs.

An excitation electrode for the center conductor of a coaxial dielectric resonator,
These effects are maximized when even the terminal member for connection with an external circuit is constructed from a conductive pattern patterned on a dielectric substrate.

Note that if the capacitor electrodes are constructed from conductive patterns on a dielectric substrate, it becomes easy to adjust the capacitance value of each capacitor, and the conductive pattern portions that constitute the electrodes of each capacitor can be simply trimmed using a known and existing trimming device. An extremely accurate capacitance value can be obtained by simply cutting or removing a portion of the material.Moreover, this trimming process involves opening the dielectric substrate so that its bidirectional surfaces face both sides in the lateral direction.
Since it is exposed, the coaxial dielectric resonator does not get in the way and can be carried out efficiently.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a dielectric filter device having a striding configuration as an embodiment of the present invention. FIG. 2 is a side view of the dielectric filter device shown in the first diagram in an assembled state. FIG. 3 is an explanatory diagram of a dielectric substrate that can be used in the dielectric filter device shown in the first diagram and a conductive pattern formed thereon. FIG. FIG. 7 is an explanatory diagram regarding another dielectric substrate and a conductive pattern thereon. FIG. 5 is an explanatory diagram of another dielectric substrate that can be used in the first illustrated device in place of the dielectric substrate shown in FIG. 3.4, and includes a chip capacitor thereon. FIG. 6 is an explanatory diagram of the first illustrated device. FIG. FIG. 7 is an exploded perspective view of the device structure, which is considered to be relatively convenient among conventional dielectric filter devices. FIG. 8 is a side view of the conventional device shown in FIG. 7 in an assembled state. It is. In the figure, IO is a quarter-wavelength coaxial dielectric resonator, 11 is a dielectric block, 12 is an open surface, 13 is a conductive layer constituting an external conductor, 14 is a hollow center conductor, and 51 is a dielectric substrate. , 51-1 is a first dielectric rod-shaped portion, 51-2 is a second dielectric rod-shaped portion, 51-3 is a tongue member, 52 is a conductive pattern, 52-+, 52-2 is for condenser electrode configuration. A conductive pattern portion 52-3 is an intermediate connection conductive pattern portion that electrically connects each conductive pattern portion.
-4 is a conductive pattern portion constituting the excitation electrode of each coaxial dielectric resonator, 53-I is an auxiliary conductive pattern, 53-2
Reference numerals 54 and 55 indicate conductive pattern portions constituting conductive terminal members for external circuit connection, and chip capacitors 54 and 55. Figure 7 conductivity and n11'. Figure 8

Claims (8)

[Claims] (1) A plurality of quarter-wavelength coaxial dielectric resonators arranged in parallel in one direction orthogonal to the axial direction with open surfaces on one end side in the axial direction aligned in the same direction; and the plurality of coaxial dielectric resonators. a dielectric substrate having a length along the direction in which the body resonators are arranged side by side, and whose main surface is arranged in a substantially perpendicular relationship to the open surface of the coaxial dielectric resonator; and; a plurality of patterns formed on the main surface of the dielectric substrate, the same number as the coaxial dielectric resonators arranged in parallel, and spaced apart from each other so as not to make electrical contact with each other. a conductive pattern; a capacitor means provided on the dielectric substrate and capacitively coupling adjacent ones of the plurality of conductive patterns; electrically connecting one end of the conductive pattern to each of the plurality of conductive patterns; a plurality of rod-shaped conductive members extending from the main surface parallel to the main surface of the dielectric substrate, fitting into the center conductor of each of the coaxial dielectric resonators, and terminating at the other end in electrical contact with the center conductor; A dielectric filter device comprising: and; (2) The plurality of conductive patterns are alternately provided along the juxtaposed direction, adjacent to each other, and on one of the front and back main surfaces of the dielectric substrate, and in the thickness direction of the dielectric substrate. The capacitor means is formed by patterning so as to have portions that overlap each other when viewed from above, so that the spacing between the adjacent conductive patterns becomes the thickness of the dielectric substrate; Each of the portions of the dielectric substrate that are located between the conductive patterns and overlap each other in the thickness direction is used as a capacitor electrode, and the portion of the dielectric substrate sandwiched between the overlapping portions is configured as a dielectric layer between capacitor electrodes; The dielectric filter device according to claim 1, characterized in that: (3) The plurality of conductive patterns are patterned along the juxtaposed direction so that all of them are provided only on one of the front and back main surfaces of the dielectric substrate; The capacitor means includes, among the plurality of conductive patterns,
The dielectric filter device according to claim 1, wherein each of the portions where adjacent ones face each other with the above-mentioned interval is used as a capacitor electrode, and the spaced portion is configured as a dielectric region between the capacitor electrodes. . (4) A pair of auxiliary conductive patterns patterned on the main surface of the dielectric substrate while leaving a space between the conductive patterns located at both ends of the plurality of conductive patterns in the juxtaposition direction; capacitor means for capacitively coupling between each of the pair of auxiliary conductive patterns and the conductive pattern adjacent to the auxiliary conductive pattern; one end of which is electrically connected to the auxiliary conductive pattern, and the other end of which is electrically connected to the dielectric pattern; 4. The dielectric filter device according to claim 1, further comprising: a conductive terminal member for external circuit connection extending outward from the body substrate. (5) The pair of auxiliary conductive patterns are formed by patterning on the front and back main surfaces of the dielectric substrate, each of which is opposite to the main surface on which the adjacent conductive pattern is formed. , and by having a portion overlapping with the adjacent conductive pattern when viewed in the thickness direction of the dielectric substrate, the distance between each auxiliary conductive pattern and each adjacent conductive pattern is The capacitor means for capacitively coupling between each of the pair of auxiliary conductive patterns and the conductive pattern adjacent to the auxiliary conductive pattern is connected to each of the auxiliary conductive patterns. and the conductive pattern adjacent to the conductive pattern, each of the overlapping portions of the dielectric substrate in the thickness direction is used as a capacitor electrode, and the portion of the dielectric substrate sandwiched between the overlapping portions is configured as a dielectric layer between the capacitor electrodes. The dielectric filter device according to claim 4, characterized in that: (6) The pair of auxiliary conductive patterns are formed on the same main surface of the dielectric substrate on which the adjacent conductive pattern is formed, among both the front and back main surfaces of the dielectric substrate. ; capacitor means for capacitively coupling each of the pair of auxiliary conductive patterns and the conductive pattern adjacent to the auxiliary conductive pattern, each of which connects each auxiliary conductive pattern to one capacitor electrode and each auxiliary conductive pattern; Each of the adjacent conductive patterns is used as the other capacitor electrode, and the space between each of the auxiliary conductive patterns and the adjacent conductive pattern is configured as a dielectric region between the capacitor electrodes; The dielectric filter device according to claim 4. (7) Each of the plurality of rod-shaped conductive members is a dielectric member that is a part of the dielectric substrate and protrudes into a narrow plate shape that fits in the hollow center conductor of the coaxial dielectric resonator in the axial direction. Claims 1 and 2, characterized in that the conductive layer is formed of a body rod-shaped portion and a conductive layer formed on the dielectric rod-shaped portion and patterned in series with each of the plurality of conductive patterns corresponding to each other. 7. The dielectric filter device according to 3, 4, 5 or 6. (8) The conductive terminal members for external circuit connection each include a dielectric bar-shaped portion that is a part of the dielectric substrate and protrudes in a direction other than the direction toward the coaxial dielectric resonator; Claims 1, 2, 3, 4, 5, characterized in that the conductive layer is formed on a dielectric bar-shaped portion and is formed by patterning a conductive layer in series with each corresponding one of the pair of auxiliary conductive patterns. , 6 or 7.