JPH0832305A - Tm multiplex mode dielectric filter - Google Patents

Abstract

PURPOSE:To enable the magnetic field coupling of the prescribed resonance elements of a preceding stage and a succeeding stage and to form an attenuation property by providing a sub opening where a sub magnetic field is passed through in a part of a partition plate formed between the plural pieces of resonators or a part of an electrically conductive cavity near the partition plate. CONSTITUTION:The magnetic field coupling is performed with a TM mode resonance element 1 for electromagnetic waves introduced from an input loop 8a and an electric field is generated in the TM mode resonance element 1 and the TM mode resonance element 2. The magnetic field of the element 2 generated corresponding to the electric field is passed through a main opening 7a and intersected to the TM mode resonance element 3 and the electric field is generated in the TM mode resonance elements 3 and 4. The magnetic field of the element 4 generated by the magnetic field is intersected to an output loop 8b and the output is taken out from the output loop 8b. At the time, since the magnetic field of the element 1 is directly coupled with the element 4 through the sub opening 7b, the input electromagnetic waves are filtered while being successively propagated from the element 1 to the element 4 and directly propagated from the element 1 to the element 4 and the attenuation property is generated for filter characteristics.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TM multimode dielectric filter having an attenuation pole using a TM multimode resonator.

[0002]

2. Description of the Related Art A conventional TM multimode dielectric filter,
For example, as shown in FIG.
In a TM dual mode dielectric filter having four stages of 14, when a filter having an attenuation pole is constructed, a cable having a first stage resonant element 11 and a final stage resonant element 14 and coupling loops 15a and 15b at both ends. It was performed by magnetic field coupling by 15. This equivalent circuit is shown in FIG. Then, the attenuation pole is adjusted by changing the angle of the coupling loops 15a and 15b of the cable 15 to change the degree of coupling, so that the attenuation pole of the solid line is obtained from the normal filter characteristic of the dotted line, as shown in FIG. The desired filter characteristics were changed. In FIG. 7, 16 is a partition plate having a plurality of slit-shaped openings, 17 is a conductive cavity, and 18a and 18b are input / output loops.

[0003]

However, the conventional TM multimode dielectric filter requires the attenuation pole forming cable 15 separately, which makes it complicated and bulky, which causes a cost increase.

Accordingly, it is an object of the present invention to provide a small-sized and cost-reducible TM multimode dielectric filter having a simple attenuation pole forming means.

[0005]

Means for solving the problems of the present invention are as follows. 1. A TM multimode resonator is formed by intersecting at least two TM mode resonance elements with each other, and a plurality of TM multimode resonators are connected and housed in a conductive cavity through a partition plate. In a TM multimode dielectric filter composed of multimode resonators, an opening for forming a damping pole for magnetically coupling a predetermined resonance element of a front-stage resonator and a predetermined resonance element of a rear-stage resonator to a part of the partition plate. TM multimode dielectric filter provided with. 2. The TM multimode dielectric filter according to claim 1, wherein a metal piece that appropriately closes the opening is provided in the opening. 3. The TM multimode dielectric filter according to claim 1, wherein a metal rod that appropriately closes the opening is inserted into a through hole formed in a conductive cavity near the opening of the partition plate.

4. At least two TM mode resonant elements are crossed with each other to form a TM multimode resonator,
In a TM multimode dielectric filter composed of a plurality of TM multimode resonators in which a plurality of TM multimode resonators are connected and housed in a conductive cavity via partition plates, the partition plates are metallized. TM multi-mode dielectric filter, which is made of a non-metal plate and is formed by partially separating the metallized metal of the partition plate so that the predetermined resonator element of the front-stage resonator and the predetermined resonance element of the rear-stage resonator are magnetically coupled.

5. At least two TM mode resonant elements are crossed with each other to form a TM multimode resonator,
A TM multi-mode dielectric filter comprising a plurality of TM multi-mode resonators in which a plurality of TM multi-mode resonators are connected and housed in a conductive cavity via a partition plate. An opening for forming an attenuation pole for magnetically coupling these resonant elements is provided near the predetermined resonant element of the front resonator and the predetermined resonant element of the rear resonator in the conductive cavity portion near the side. TM
Multimode dielectric filter.

[0008]

According to the present invention, a part of a partition plate formed between a plurality of TM multimode resonators or a part of a conductive cavity near the partition plate is provided with a sub magnetic field other than the main opening through which the main magnetic field passes. Since a sub-opening that passes through is provided, through this sub-opening,
The predetermined resonance element of the front resonator and the predetermined resonance element of the rear resonator are magnetically coupled by the auxiliary magnetic field to form an attenuation pole.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of this embodiment, and FIGS. 2 to 6 are views showing other damping pole forming means. In FIG. 1, 1 and 2 are TM mode resonant elements, which are made of dielectric ceramic and are integrally molded in a cross shape orthogonal to each other by pressing or the like to form a TM double mode resonator R1. Coupling grooves 5 are formed from two corners in the diagonal direction of the cross portion of the TM dual mode resonator R1 in the diagonal directions. Due to the coupling groove 5, the TM mode resonant elements 1 and 2 are coupled through the electric field lines of the even mode and the electric field lines of the odd mode, respectively.

The four cross-shaped tips of the TM double mode resonator R1 are respectively connected to the four inner surfaces of the conductive cavity 6 to form a TM double mode resonator R10. The TM dual mode resonator R1 and the conductive cavity 6 configured by the TM mode resonant elements 1 and 2 are usually integrally formed of a dielectric material, and a conductor is provided on the outer surface of the conductive cavity 6. TM
A dual mode resonator R10 is constructed.

On the other hand, the TM mode resonant elements 3 and 4 are also integrally molded as in the case of the TM mode resonant elements 1 and 2 to form a T
M dual mode resonator R2 and TM dual mode resonator R
20 will be configured.

These TM dual mode resonators R10, R
20 is connected via the partition plate 7. This partition 7
Is a nonmetal such as a metal or a metallized dielectric ceramic. Then, in the partition plate 7, in the direction perpendicular to the TM mode resonant elements 2 and 3,
A rectangular main opening 7a is provided in a direction parallel to the TM mode resonant elements 1 and 4. In addition, in FIG.
Although there is one main opening 7a, a plurality of similar openings may be formed under the main opening 7a at equal intervals. Reference numeral 7b is a sub-opening, which is a part of the partition plate 7 and is formed to have a proper size at a location where the tip portions of the first-stage TM mode resonant element 1 and the final-stage TM mode resonant element 4 face each other. Reference numerals 8a and 8b denote input / output loops, which are arranged so that the first-stage TM mode resonant element 1 and the final-stage TM mode resonant element 4 are parallel to their loop surfaces.

The present embodiment has the above-mentioned configuration, and the operation will be described below. The electromagnetic wave introduced from the input loop 8a is magnetically coupled to the TM mode resonant element 1 and T
An electric field is generated in the M-mode resonant element 1 and the TM-mode resonant element 2. The magnetic field of the TM mode resonant element 2 generated in response to this electric field is linked to the TM mode resonant element 3 through the main opening 7a, and the TM mode resonant elements 3 and 4 are connected.
To generate an electric field. The magnetic field of the TM mode resonant element 4 generated by this electric field is linked to the output loop 8b, and the output is taken out from the output loop 8b.

In this case, the magnetic field of the TM mode resonant element 1 is directly coupled to the TM mode resonant element 4 through the sub aperture 7b. In this way, the input electromagnetic wave is filtered while sequentially propagating to the TM mode resonant elements 1, 2, 3 and 4, and is directly propagated to the TM mode resonant elements 1 to 4 to give an attenuation pole to the filter characteristic. The circuit is shown in FIG.

In this embodiment, the sub-aperture 7b provided in a part of the partition plate 7 guides the magnetic field of the TM mode resonant element 1 and magnetically couples with the TM mode resonant element 4, and as described above, It gives an attenuation pole to the filter characteristics,
The size of this attenuation pole depends on the size of the sub-opening 7b. In FIG. 9, the dotted line shows the normal filter characteristic when the sub-aperture 7b is not provided. From this state, the sub-opening 7
As the size of b is increased, the filter characteristic has a large attenuation amount where the attenuation pole appears, as shown by the solid line.

Other means for forming the attenuation pole and a modified example will be described below. In FIG. 2, a metal piece 7c is soldered to one edge of the sub-opening 7b provided in the partition plate 7, and the size of the sub-opening 7b is changed by bending the metal piece 7c so that electromagnetic waves passing through the sub-opening 7b can be changed. The amount of circles is adjusted.

In FIG. 3, a metal rod 7e is inserted into a through hole 7d formed in the conductive cavity 6 near the sub-opening 7b of the partition plate 7 to cover the sub-opening 7b by an appropriate amount to adjust the magnetic field coupling. It was done.

FIG. 4 shows that when the partition plate 7 is a metallized dielectric ceramic, the metallized metal on both sides is peeled off to reveal the base 7f without opening a sub-opening in the partition plate 7, and an electromagnetic wave is passed through this base 7f. The function of the sub-opening is provided through the boundary. The base 7f is provided slightly inside the edge of the partition plate 7, but it may be provided on the edge of the partition plate 7 as shown in FIG. The reason for providing the element 7f on this edge is to adjust the coupling amount of the sub magnetic field by scraping the metallized metal on the edge of the partition plate 7 from the side surface of the product after the final product, as shown in FIG. It can be done.

In FIG. 6, sub-openings are not provided in the partition plate 7, but sub-openings 7g and 7g are opened in the conductive cavities 6 and 6 near the end sides of the partition plate 7, respectively. 7
g and 7g are bypassed by the magnetic field, and the TM mode resonant element 1 and T
The M-mode resonant element 4 is magnetically coupled. Also in this case, when the conductive cavity 6 is a metallized dielectric ceramic, the metallized metal is partially peeled off to expose the dielectric substrate instead of the sub-opening 7g, and the function of the sub-opening 7g is achieved. Can be made.

[0020]

According to the present invention, a part of the partition plate formed between the TM multimode resonators or the conductive cavity portion is provided with
In addition to the main opening through which the main magnetic field passes, since the sub opening through which the sub magnetic field passes is provided, the predetermined resonant element of the front resonator and the predetermined resonant element of the rear resonator are magnetically coupled through this sub opening,
An attenuation pole will be formed.

It is also possible to peel off a part of the metallized metal of a partition plate made of a nonmetal plate such as a metallized dielectric ceramic to expose the base material, and to couple the magnetic field through the base material.

It is also possible to provide a sub-opening in the cavity near the edge of the partition plate to bypass the magnetic field and couple it. When the cavity is formed of a metallized non-metal plate, the metallized metal of the portion can be peeled off instead of the sub-opening to perform the same function.

[Brief description of drawings]

FIG. 1 is a perspective view of a TM double mode dielectric filter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a means for closing the sub-opening of the partition plate shown in FIG.

FIG. 3 is a perspective view showing a means for closing the sub-opening of another partition plate.

FIG. 4 is a perspective view showing another modified example of the partition plate shown in FIG.

FIG. 5 is a perspective view showing still another modification of the partition plate shown in FIG.

FIG. 6 is a partial perspective view of a partition plate and a conductive cavity in which a sub-opening is provided in a conductive cavity near the edge of the partition plate.

FIG. 7 is a perspective view of a conventional TM dual mode dielectric filter.

FIG. 8 is an equivalent circuit diagram of this embodiment and a conventional example.

FIG. 9 is an attenuation pole characteristic diagram of the present example and a conventional example.

[Explanation of symbols]

 1, 2, 3, 4 TM mode resonant element R1, R2 TM dual mode resonator R10, R20 TM dual mode resonator 5 coupling groove 6 conductive cavity 7 partition plate 7a main opening 7b auxiliary opening 7c metal piece 7d through hole 7e Metal rod 7f Dielectric base 7g Sub openings 8a, 8b Input / output loop

Claims (5)

[Claims] 1. A TM multiple mode resonator is formed by intersecting at least two TM mode resonant elements with each other, and a plurality of the TM multiple mode resonators are connected and housed in a conductive cavity via a partition plate. In a TM multi-mode dielectric filter composed of a plurality of TM multi-mode resonators, an attenuation that magnetically couples a predetermined resonance element of a front resonator and a predetermined resonance element of a rear resonator to a part of the partition plate. A TM multimode dielectric filter provided with an opening for forming a pole. 2. The TM multimode dielectric filter according to claim 1, wherein a metal piece that appropriately covers the opening is provided in the opening. 3. The TM multimode dielectric filter according to claim 1, wherein a metal rod that appropriately closes the opening is inserted into a through hole formed in a conductive cavity near the opening of the partition plate. 4. A TM multimode resonator is formed by intersecting at least two TM mode resonance elements with each other, and a plurality of the TM multimode resonators are connected and housed in a conductive cavity via a partition plate. In a TM multi-mode dielectric filter composed of a plurality of TM multi-mode resonators, the partition plate is made of a metallized non-metal plate, and the metallized metal of the partition plate is partially peeled off to form a pre-stage resonator. 2. A TM multi-mode dielectric filter in which the predetermined resonance element and the predetermined resonance element of the post-stage resonator are magnetically coupled. 5. A TM multiple mode resonator is formed by intersecting at least two TM mode resonant elements with each other, and a plurality of the TM multiple mode resonators are connected and housed in a conductive cavity via a partition plate. In a TM multi-mode dielectric filter composed of a plurality of TM multi-mode resonators, a conductive cavity portion near an end side of the partition plate, which includes a predetermined resonator element of a front-stage resonator and a rear-stage resonator. A TM multimode dielectric filter having an opening for forming an attenuation pole for magnetically coupling these resonant elements in the vicinity of a predetermined resonant element.