JPS6324703A - Filter - Google Patents

Abstract

PURPOSE:To eliminate the need for a lead-shaped contact terminal, or a lead wire, by sandwiching under pressure and supporting a coupling substrate between a contact terminal mounted on a resonator being arranged in parallel in a line, and an input/output connector. CONSTITUTION:The elastic contact part 5c of the contact terminal 5 mounted on each resonator 2 is connected elastically to a ccrresponding capacitor electrode 7 from a main surface on one side of the coupling substrate 3. Meanwhile, the main surface on the opposite side of the coupling substrate 3 is received by the central conductor 9a of the input/output connector 9. Therefore, the coupling substrate 3 is sandwiched under pressure and supported between the contact terminal 5, and the input/output connector 9, then it is fixed in a steady shape. Moreover, since the input/output connector 9, and the contact terminal 5 are connected elastically with corresponding electrodes 8 and 7, capacity coupling between the input/output connectors 9, 9, and the resonators 2,... can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a filter used, for example, as an antenna filter.

<Prior Art> Generally, this type of filter is a case I filter as shown in FIG. Multiple dielectric coaxial resonators 2° inside...
・Incorporating a 3° bonding substrate is known.

In this conventional filter, the resonators 2°, . . . are arranged in parallel in a row with their open end faces facing in the same direction. The bonding substrate 3° has a plurality of capacitor electrodes 4° on one main surface of a long flat ceramic plate.
and input/output electrodes 5° and 5o,
The main surfaces are arranged in a direction parallel to the axial direction of the resonators 2°, . . . . Each capacitor electrode 4° on the coupling substrate 3° and the inner conductor of each resonator 2° are individually connected. In addition, coaxial connectors 6° and 6o for input and output are attached to the outer wall of the case 1o, and the center conductors of these coaxial connectors 6° and 6o for input and output are connected to the input and output electrodes of the coupling board 3°. 5°.

5o, respectively.

<Problems to be solved by the invention> By the way, in such a conventional structure, the resonator 2o
The inner conductor and the capacitor electrode 4o of the coupling substrate 3° are:
The connection was made by soldering using a 7° lead-shaped connection terminal. Further, the center conductors of the coaxial connectors 6° and 6° and the input/output electrodes 5° of the coupling board 3° were connected by soldering via lead wires of 8°.

This lead-like connecting terminal 7° or lead wire 8° needs to have a certain length in order to absorb thermal stress or mechanical stress. If this lead-shaped connecting terminal 7° or the like has a certain length, it will have unnecessary inductance, and the tiler characteristics as designed cannot be obtained as a whole.

In addition, the above-mentioned soldering process is required to connect each electrode 3° and 4o of the coupling board 3° to the inner conductor and the coaxial connector 5°, which has the disadvantage of increasing costs. .

Furthermore, as mentioned above, since the coupling board 3° is placed horizontally in the case 1° in a direction parallel to the axial direction of the resonator 2°, at least the width of the coupling board 3° It was necessary to leave a space between the 2° and the inner wall of the case 1°. For this reason, it was not possible to reduce the size of the case by 1°.

In view of these conventional problems, the present invention simplifies the manufacturing process by omitting the solder connections between the coupling board, the resonator, and the input/output connector, and eliminates the generation of unnecessary inductance to achieve the characteristics as designed. The purpose is to make it possible to obtain the same characteristics and to make it possible to downsize the device.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a filter including a plurality of dielectric coaxial resonators and a coupling substrate installed in a case, in which a plurality of dielectric coaxial resonators and a coupling substrate are arranged in parallel in one row. An elastic contact terminal is provided on each inner conductor of the resonator, and a capacitor electrode corresponding to each resonator is formed on one main surface of the coupling substrate, and an input/output electrode is formed on the other main surface. This coupling substrate is arranged with the main surface perpendicular to the axial direction of the resonator, and each capacitor electrode is brought into elastic contact with the corresponding contact terminal, and the coupling substrate is placed on the opposite side of the contact terminal. An output connector is provided, and its inner conductor is brought into contact with the input/output electrode.

Effect> In the above configuration, the contact terminals provided on the inner conductors of the resonators arranged in parallel in one row come into elastic contact with the capacitor electrodes of the coupling substrate. The center conductor of the input/output connector contacts the input/output electrode from the opposite side of the coupling board. Therefore, the coupling board is supported by pressure between the contact terminal and the input/output connector, and each electrode on the coupling board is held in a connected state with the contact terminal and the connector.

<Example> Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a partially cutaway view of this embodiment.

The filter of this embodiment includes a case l made of metal such as aluminum alloy. Inside this case l, there are a plurality of (five in the drawing) dielectric coaxial resonators 2. ... and a bonding substrate 3 are incorporated.

Each resonator 2 includes a ceramic cylindrical dielectric block 2
a, and an outer conductor 2 is provided on the outer peripheral surface of this dielectric block 2a.
b, and an inner conductor 2 is formed on the circumferential surface of the central through hole 4.
The inner conductor 2C and the outer conductor 2b are short-circuited via an electrode 2d formed on one end surface of the block 2a, and the other end surface is an open end surface where the bare surface of the block 2a is exposed. This is a so-called 1-wavelength dielectric coaxial resonator.

And these resonators 2. ... are arranged in parallel with each other with their open end surfaces facing in the same direction and with their outer peripheral surfaces adjacent to each other.

An elastic contact terminal 5 is provided on the inner conductor 2C of each resonator 2.
is installed. As shown in FIG. 2, this contact terminal 5 has a conductor side contact portion 5a that fits into the through hole 4 of the dielectric block 2a and contacts the inner conductor 2C, and abuts on the open end surface of the dielectric block 2a. It has a flange portion 5b that prevents the dielectric block 2a from falling into the through hole 4, and an elastic contact portion 5C that projects in a chevron shape from the position of the open end surface of the dielectric block 2a. It is designed to be elastically deformable in the axial direction. This contact terminal 5 is formed by bending, rather than bending, a sheet of flat spring material 50 as shown in FIG. The central part of the main part of the leaf spring material 50 becomes the elastic contact part 5c, the part protruding almost radially from the main part becomes the conductor side contact part 5a, and the part slightly protruding from the main part becomes the collar part 5b.

As shown in FIGS. 1 and 2, the bonding substrate 3 includes a plurality of capacitor electrodes 7 on one (lower side in the figure) main surface of a flat ceramic plate 6. . . . in the resonator 2.
..., and input/output electrodes 8.8 are formed at both ends of the other main surface (upper side in the figure). This coupling substrate 3 is arranged on the open end surface side of the resonator 2 in a state perpendicular to the axial direction of the resonator 2, and each capacitor electrode 7 is elastically contacted with the contact terminal 5 of each resonator 2.

The input/output connector 9.9 is attached to the outer wall of the case l facing the coupling board 3. This input/output connector 9 is located at a location corresponding to the input/output electrode 8.8, receives the coupling board 3 on the opposite side of the resonator 2 from the contact terminal 5, and has a central conductor 9a. It is in contact with the input/output electrode 8.

10 is a spacer.

In the above configuration, the elastic contact portions 5c of the contact terminals 5 attached to each resonator 2 come into elastic contact with the corresponding capacitor electrodes 7 from one main surface side of the coupling substrate 3. On the other hand, the main surface on the opposite side of the coupling board 3 is fixed to the center conductor 9a of the input/output connector 9. Therefore, the coupling board 3 is supported by pressure between the contact terminal 5 and the input/output connector 9, and is immovably fixed. Since the input/output connector 9 and the contact terminal 5 are in elastic contact with the corresponding electrodes 8.7, the input/output connector 9.
9 and resonator 2. ... are capacitively coupled to each other.

Note that the contact terminal 5 attached to the inner conductor 2c of the resonator 2 is not limited to the structure of the above embodiment. Any material may be used as long as it is elastically deformed in the axial direction of the container 2 and exerts elastic force in the same direction.

FIG. 4 shows another embodiment of the contact terminal.

The contact terminal 51 of this embodiment is the same as the contact terminal 5 of the above embodiment.
Similarly, it is constructed from a single sheet of leaf spring material, and an elastic contact portion 51c is formed by cutting and bending the main portion of the leaf spring material. 51a is a conductor-side contact portion that contacts the inner conductor 2c of the resonator 2, and 51b is a flange portion that prevents it from falling into the through hole 4.

Further, in the above embodiment, a plurality of dielectric coaxial resonators 2.・
. . , are arranged in parallel in one row, the present invention, as shown in FIG. 5, has resonators 2, .
,... are arranged in two rows in parallel, and the resonators in both rows are 2°...,
It can also be applied to filters with opposing angles of 2°, . . . .

In FIG. 5, a plurality of resonators 2. ..., 2°, ...
· are arranged in parallel in two rows, and the resonators 2. and 2. in both rows are arranged in parallel. ..., 2
°, . . . are opposed to each other with the bonding substrate 3 in between.

One row of resonators 2. . . (2°, . . .) is shifted by approximately a radius from the opposing resonator 2°, . Corresponding to these resonators 2.2 degrees, capacitor electrodes 7.
....

7°,... is formed, and on one main surface, input/output electrodes 8 corresponding to the three input/output connectors 9, 9, 11 are formed.
．． 8.8° is formed. Elastic contact terminal 5
is attached to the inner conductor of each resonator 7, 7°.

The input/output connectors 9.11 are provided in the case l at both ends of the coupling board 3, and are also provided in the case 1 at the center of the coupling board 3.
la is adapted to receive one main surface of the bonding substrate 3. The input/output connectors 9.9 located at both ends of the coupling board 3 may be provided on the outer wall of the case 1 adjacent to the outer resonators 2, 2', as shown by solid lines in the figure. Alternatively, as shown by imaginary lines in the figure, it may be provided on the outer wall facing the bonding substrate 3.

Note that the elastic contact terminals 5 are connected to the resonators 2.
..., and not necessarily all resonators 2.・・・
・There is no need to attach it to 2゛,...

<Effects of the Invention> As described above, according to the present invention, the coupling board is supported under pressure between the contact terminals attached to the resonators arranged in parallel in one row and the input/output connector, and the coupling board is The connection between the electrodes of the board, the contact terminals, and the input/output connectors is ensured.

Therefore, unlike conventional methods, there is no need to use lead-shaped contact terminals or lead wires to connect the inner conductor of the resonator and the capacitor electrode, or to connect the input/output terminals to the input/output electrodes. Filter characteristics as designed can be obtained without generating inductance.

Furthermore, since the electrodes of the coupling board and the resonator or connector do not need to be connected by soldering, the conventional soldering process can be omitted and costs can be reduced.

Furthermore, since the coupling substrate is placed in a reclining manner with respect to the parallel resonators, it can be placed between the resonators and the inner wall of the case, or between two rows of opposing resonators in the case of the type in which the resonators are arranged facing each other. There is no need to provide a wide interval, and the filter can be made smaller accordingly.

[Brief explanation of drawings]

1 to 5 relate to the present invention; FIG. 1 is a partially cutaway plan view of a filter according to an embodiment thereof, FIG. 2 is an exploded perspective view of a coupling substrate portion, and FIG. 3 is an exploded perspective view of a contact terminal. 4 is a perspective view showing another embodiment of the contact terminal, and FIG. 5 is a plan view of a filter according to another embodiment. FIG. 6 is a plan view of a conventional example. l... Case, 3... Bonding board, 5... Contact terminal, 7.7°... Capacitor electrode, 8.8°... Input/output electrode, 9.11... Input/output Connector for

Claims (1)

[Claims] (1) In a filter that incorporates a plurality of dielectric coaxial resonators and a coupling substrate in a case, an elastic contact terminal is provided on each inner conductor of the resonators arranged in parallel in a row, and the coupling substrate is provided with an elastic contact terminal. Capacitor electrodes corresponding to each of the resonators are formed on one main surface, and input/output electrodes are formed on the other main surface, and this coupling substrate is placed in a state in which the main surface is perpendicular to the axial direction of the resonators. and each capacitor electrode is brought into elastic contact with the corresponding contact terminal, and an input/output connector is provided on the opposite side of the coupling board from the contact terminal, and its inner conductor is brought into contact with the input/output electrode. A filter featuring: