JPH10200314A - Dielectric coaxial resonant component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To inexpensively provide a dielectric coaxial resonant component with which the number of parts is reduced, electromagnetic field leakage can be prevented and mountability is improved by providing an outer conductor in contact with an inner conductor on one end face and one input/output electrode formed while being insulated from the outer conductor at one part in the forming area of outer conductor over all the outer peripheral surface including both end faces of dielectric block. SOLUTION: The outer conductor is formed over all the outer peripheral surface including both end faces 3a and 3b of dielectric block 2 and this outer conductor is respectively in contact with the inner conductor on the end face 3a and the inner conductor on the end face 3b. One input/output electrode 6 is formed inside the forming area of outer conductor. This input/output electrode 6 is formed while being insulated with the outer conductor, and formed over side faces from the mounting plane of dielectric block 2. Thus, since the functions of the inductor and capacitor or the like can be added to one dielectric block 2, the number of parts for consisting the dielectric coaxial resonance component can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric coaxial resonance component, and more particularly to a dielectric coaxial resonance component used for a notch filter, a VCO, and the like.

[0002]

2. Description of the Related Art The following structure is used as a conventional dielectric coaxial resonance component. Here, a dielectric coaxial resonance component used for a notch filter will be described as an example.

Conventionally, a notch filter shown in FIG. 4 has been used. Notch filter 5 shown in FIG.
Numeral 0 is composed of four types of independent components: coils 51a and 51b, a capacitor 52, a lead terminal 53, and a dielectric resonator 54. The coils 51a and 51b are formed by winding a conductive wire in a cylindrical shape as shown in FIG.

[0004] The capacitor 52 is a single-plate capacitor in which electrodes are formed on upper and lower surfaces of a dielectric having a high dielectric constant, which are paired with each other.

In the dielectric resonator 54, an inner conductor forming hole 55 is formed in a rectangular parallelepiped dielectric block, and an inner conductor is formed on the inner peripheral surface of the inner conductor forming hole 55. An outer conductor is formed on the outer peripheral surface of the body block, and one end of the inner conductor is formed on the end face opposite to the end face 58 so as to be connected to the outer conductor.

Next, how these components are connected will be described. First, an inner conductor of the dielectric resonator 54 is connected to one capacitor electrode of the capacitor 52 via a lead terminal 53, and the other capacitor electrode is joined to a transmission line 56 on a wiring board by a method such as soldering. Is done. The transmission line 56 is partially disconnected before and after the capacitor 52, and the disconnected portions are the coils 51a and 5a, respectively.
1b. The coils 51a and 51b are joined to the transmission line 56 by a method such as soldering. An outer conductor formed on the outer peripheral surface of the dielectric resonator 54 is connected to a ground electrode 57 on the wiring board.

[0007] The notch filter thus configured is
It works as follows. That is, first, the high frequency signal sent to the coil 51a is
2, the characteristic impedance is matched, and only a high-frequency signal of a predetermined frequency is sent to the dielectric resonator 54 via the lead terminal 53 as a noise component. The remaining signals are not sent to the dielectric resonator but propagate to the coil 51b. The high frequency signal of the noise component sent to the dielectric resonator is consumed as resonance energy. FIG. 5 is an equivalent circuit showing a notch filter having the configuration shown in FIG.

[0008]

However, in the above conventional example, the coils 51a and 51b, the capacitor 52, and the
3. Since the four types of independent components of the dielectric resonator 54 are used, the number of components is large, and the locational restrictions upon mounting are large. In addition, work such as soldering is required to connect each component, which has led to an increase in cost. Further, since the end face 58 is an open face, an electromagnetic field leaks from the end face 58, and when assembled into a set, there is a possibility that other parts may be adversely affected.

Although there are some differences in the types and arrangements of components used, other trap filters and dielectric resonators used for VCOs have the same problems as the notch filters described here. There was no change in the point where it was.

Accordingly, it is an object of the present invention to provide an inexpensive dielectric coaxial resonance component which has a small number of components, can prevent electromagnetic field leakage, and has excellent mountability.

[0011]

In order to achieve the above object, in a dielectric coaxial resonance component according to the present invention, a dielectric block made of a dielectric material and end faces of the dielectric block which are paired with each other. An inner conductor forming hole penetrating through the inside of the dielectric block, an inner conductor formed on the entire inner peripheral surface of the inner conductor forming hole, and an inner peripheral surface of the inner conductor forming hole. A part of the inner conductor non-formed portion formed over the entire inner circumference thereof, and an outer conductor formed on the entire outer peripheral surface including both end surfaces of the dielectric block and in contact with the inner conductor at at least one end surface, One input / output electrode formed insulated from the outer conductor is provided in a part of the formation region of the outer conductor.

According to the structure of the present invention, the input / output electrodes formed on the dielectric coaxial resonance component function as inductors. Further, since a capacitance is generated between the input / output electrode and the inner conductor, the capacitor also functions as a capacitor. As a result, the function performed by the conventional independent component can be added to one dielectric block, the number of components can be reduced, and a dielectric coaxial resonance component excellent in mountability can be provided. In addition, there is no need to connect each component, which contributes to cost reduction.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the dielectric coaxial resonance component according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a first embodiment of a dielectric coaxial resonance component according to the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. FIG.
FIG. 3 shows a mounting example of the dielectric coaxial resonance component 1 of the present embodiment.

As shown in FIG. 1, a dielectric coaxial resonance component 1
Is composed of a rectangular or cylindrical dielectric block 2 made of a ceramic material.

The dielectric block 2 has a pair of end faces 3a.
3b, and the inner conductor forming hole 4 is formed from the end face 3a toward the end face 3b. In the present embodiment, the shape of the inner conductor forming hole 4 is a circular cross section, but is not limited to this shape, and may be an arbitrary shape such as an elliptical shape. Further, a step may be provided in the middle of the inner conductor forming hole 4 so that a step is formed, and the inner diameter of the end face 3a is different from that of the end face 3b.

The inner conductors 5a and 5b are formed on the inner conductor forming hole 4 as shown in FIG. A gap (a portion where no conductor is formed) 7 is provided between the inner conductor 5a and the inner conductor 5b, and they are formed at an interval from each other.

An outer conductor is formed on the entire outer peripheral surface of the dielectric block 2 including both end surfaces 3a and 3b. In contact.

One input / output electrode 6 is formed in the region where the outer conductor is formed. The input / output electrode 6 is formed insulated from the outer conductor.
Is formed from the mounting surface to the side surface. The reason why it is formed from the mounting surface to the side surface is to make it possible to check the state of soldering with the electrodes of the substrate during mounting and to increase the soldering strength. By the way, in the present embodiment, the input / output electrode 6 is formed over the mounting surface and the side surface, but the input / output electrode may be formed at an arbitrary position without being limited thereto. Note that, in FIG.
The mounting surface is shown as the upper surface of FIG.

The outer conductor, the inner conductors 5a and 5b, and the input / output electrode 6 include the inner peripheral surface of the dielectric block 2 by means of electroless plating of a highly conductive electrode material such as silver or copper. After being applied to the entire surface, it is formed by a method such as performing an etching process on a necessary portion.

The notch filter configured as described above operates as follows. That is, among the high-frequency signals transmitted from the transmission line 12a shown in FIG.
To the input / output electrode 6 of the dielectric coaxial resonance component 1. The signal sent to the input / output electrode 6 is capacitively coupled to the inner conductor 5b by the capacitance generated between the input / output electrode 6 and the inner conductor 5b, and is consumed as resonance energy. The remaining high-frequency signal does not flow to the transmission line 12b side,
It is propagated to the 2c side.

The coupling amount CS of the capacitive coupling between the input / output electrode 6 and the inner conductor 5b can be changed by adjusting the size of the input / output electrode 6 and the positional relationship between the input / output electrode 6 and the gap 7. it can. Also, the shape of the transmission line 12b,
The impedance can be matched by adjusting the coupling amount CS.

The dielectric coaxial resonance component according to the present invention is not limited to the notch filter as shown in the above embodiment, but can be applied to, for example, a dielectric filter used in a VCO.

[0024]

As described above, according to the dielectric coaxial resonance component of the present invention, functions such as an inductor and a capacitor can be added to one dielectric block.
The number of components for constituting the dielectric coaxial resonance component can be reduced, and a dielectric coaxial resonance component excellent in mountability can be provided. Further, since the number of parts is reduced, the probability of failure of the whole set is reduced, and the reliability is improved. Further, the connection work between the components is not required, and the dielectric coaxial resonance component can be formed only by processing such as etching. In addition, since the open surface is formed on the inner conductor forming hole, magnetic field leakage from the open surface can be suppressed.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of a dielectric coaxial resonance component according to the present invention.

FIG. 2 is a sectional view showing a first embodiment of a dielectric coaxial resonance component according to the present invention.

FIG. 3 is a perspective view showing a mounting example of the first embodiment of the dielectric coaxial resonance component according to the present invention.

FIG. 4 is a perspective view showing the configuration of a conventional notch filter.

FIG. 5 is an equivalent circuit showing the configuration of a conventional notch filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dielectric coaxial resonance component 2 Dielectric block 3a, 3b End face of dielectric block 4 Inner conductor forming hole 5a, 5b Inner conductor 6 Input / output electrode 7 Conductor non-formed part 9 Conductor non-formed part 11 Ground electrode 12a, 12b, 12c Transmission line 50 Notch filter 51a, 51b Coil 52 Capacitor 53 Lead terminal 54 Dielectric resonator 55 Inner conductor forming hole 56 Transmission line 57 Earth electrode 58 End face (non-conductor portion)

Claims (1)

[Claims] A dielectric block formed of a dielectric material; an inner conductor forming hole having an opening at a pair of end faces of the dielectric block and penetrating through the inside of the dielectric block; An inner conductor formed on the entire inner circumferential surface of the inner conductor forming hole; an inner conductor non-formed portion formed on a part of the inner circumferential surface of the inner conductor forming hole over the entire inner circumference; An outer conductor that is formed on the entire outer peripheral surface including both end surfaces of the block and that is in contact with the inner conductor on at least one end surface, and that is formed on a part of the outer conductor forming region insulated from the outer conductor; And a plurality of input / output electrodes.