JPS63299601A - Resonator device - Google Patents

Abstract

PURPOSE:To prevent the misregistration of a conductor cavity and a metallic case, to stabilize a resonance frequency or a coupling degree and to prevent an adjusting screw from being protruded in the outer direction of a case by fitting a cap at the hole of the wall surface of a conductor cavity, inserting an adjusting member with a male screw into the screw hole of the cap and storing the adjusting member into the metallic case. CONSTITUTION:On a wall surface of a conductor cavity 11 of the providing scheduled place of resonance frequency adjusting members 21 and 22 and a frequency adjusting member 23, holes 24, 25 and 26 are formed, caps 27, 28 and 29 with a flange having a screw hole at the holes 24-26 are fitted, and adjusting members 21, 22 and 23 are respectively screwed into the screw hole of the cap. The cap is soldered to a metallic film 14 of the cavity 11. For the members 21 and 22, a male screw having slender needle-shaped projections 21a and 22a at a tip is used, and for the member 23, the male screw not having the needle shaped projection at the tip is used. The adjusting screws 21, 22 and 23 are supported at the caps 27, 28 and 29, not supported at a metallic case 12 and stored into the internal part. The assembling of the metallic case 12 is executed after the adjustment of the resonance frequency and the coupling degree by the above mentioned adjusting screw is completed.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a resonator device, and particularly to a resonator device equipped with a resonant frequency adjustment mechanism or a mechanism for adjusting the degree of coupling between resonators.

As is well known, the above resonator device is used as a high frequency oscillation element or as a filter. By the way, when used in such applications as oscillation elements and filters, it is desirable to be able to adjust the resonant frequency and the degree of coupling between resonators, and for this reason conventionally the conductor cavity that constitutes the resonator, as shown in Fig. 5, is Select an appropriate location in 1, drill a hole 3 into which the adjustment screw 2 is loosely inserted, cut a female thread in the corresponding location of the metal case 4 that covers the conductor cavity 1, and insert the adjustment screw 4.
was inserted into the conductor cavity 1, and the resonance frequency or degree of coupling was adjusted depending on the amount of insertion. Note that forming a hole into which the adjusting screw can be inserted loosely without cutting the female thread for directly screwing the adjusting screw into the conductor cavity 1 is because the conductor cavity 1 is generally made of a sintered dielectric ceramic with a metal film formed on the inner wall surface. By being composed of bodies.

However, in the above configuration, the adjustment screw is screwed in using the metal case, so if the conductor cavity and metal case become misaligned for some reason, However, there is a problem in that the insertion amount of the adjustment screw into the conductor cavity changes, thereby changing the resonant frequency or the degree of coupling. In addition, the adjustment screw protrudes outward from the metal case, so
When handling, care must be taken not to collide with other objects, which makes handling inconvenient.

An object of the present invention is to provide a useful resonator device that can solve all of these problems.

In order to achieve the above object, a resonator device according to the present invention has a hole in the wall surface of a conductor cavity constituting the resonator, and a cap having a screw hole is fitted into the wire hole. A male threaded adjusting member is screwed into the screw hole of the cap, and the adjusting member is housed in a metal case having a four-body cavity.

Next-"L2N Figure 1 shows an example of applying the present invention to a filter, 1)
is a conductor cavity, and 12 is a metal case.

The conductor cavity 1) has a structure in which a metal film 14 is formed on both the inside and outside surfaces of a casing 13 made of dielectric ceramic, and dielectric pillars 15 and 16 are arranged in the space between the dielectric pillars 15 and 16 perpendicular to the axial direction (Z). A plurality of pieces (two pieces in the illustrated example) are arranged in the direction shown in FIG. Electrodes 17.18 made of silver or the like are formed on the upper and lower end surfaces of the dielectric columns 15.16, and are integrally connected to the metal film 14 on the inner surface of the conductor cavity 1). Each dielectric column 15, 16 forms, together with the conductor cavity 1) surrounding it, a resonator for the T Mo le mode. Further, each dielectric column 15, 16 is electromagnetically coupled via a TM cutoff waveguide formed by a space orthogonal to the Z-axis direction, and constitutes a filter as a whole.

As shown in FIG. 2, members 21 and 22 for adjusting the resonant frequency and members 23 for adjusting the degree of coupling between the resonators are provided at appropriate positions on the wall surface of the conductor cavity 1) as follows. ing. That is, first, the resonance frequency adjustment members 21, 22,
and the conductor cavity 1) where the frequency adjustment member 23 is planned to be installed.
Holes 24, 25, 26 are formed on the wall, and wire holes 24-2
Flange cap with screw hole at 6 27, 28, 29
are fitted, and adjustment members 21, 22, and 23 are screwed into the screw holes of the caps 27 to 29, respectively.

The holes 24, 25, and 26 only need to be large enough to fit the flange cap, and since the adjusting member is screwed into the holes through the cap, precision in the hole dimensions is not required. The positions of the holes 24, 25, and 26 are determined by the frequency adjustment member 21. [If coupling adjustment member 23 is provided, it is desirable to place it close to the circumference of the dielectric column as shown in FIG. desirable.

In this embodiment, the caps 27 to 29 are made of metal, and are connected to the metal film 14 of the conductor cavity 1) by soldering. The reason why a cap with a brim was used was to completely close the hole made in the conductor cavity 1).

The adjustment members 21, 22, 23 are inserted into the door body cavity 1.
) may be made of any material such as metal, dielectric, etc., as long as it can change the electromagnetic field distribution within ); The shape does not matter as long as it has a length that can reach a considerable amount into the cavity 1). In this embodiment, as shown in FIG. 2, the frequency adjustment members 21 and 22 are male screws having elongated needle-like projections 21a and 22a at their tips, and the coupling adjustment member 23 is a male screw having no needle-like projections at its tips. is used.

Each of these adjusting screws 21, 22, 23 has a cap 27, 2
8.29, and is not supported by the metal case 12, but is housed inside it (see FIG. 1).

The metal case 12 is a housing that encases the entire conductor cavity 1), and is assembled after the adjustment of the resonant frequency and degree of coupling using the adjustment screws 21, 22 and 23 is completed.

In this embodiment, the conductor cavity 1) has a metal film 14 formed on both the inner and outer surfaces of the dielectric casing 13, but at least the inner surface and the portion for soldering the cap are minimally formed on the outer surface. Good too. In addition, in the embodiment, dielectric columns 15 and 16 are provided inside the conductor cavity 1), but the above-mentioned method is applied to a conductor cavity (corresponding to a cavity resonator) in which no dielectric column is provided inside. It is also possible to apply an adjustment member with a similar configuration.

3 and 4 show another embodiment of the invention. In this embodiment, a hole 32 is formed in the dielectric column 31, and the tip of an adjustment member 35 screwed into the conductor cavity 33 via a cap 34 is inserted into the hole 32. Adjustment member 3
A portion 35a screwed into the cap 34 is made of the same dielectric material as the conductor cavity 33, and the dielectric column 31
The portion 35b inserted into the dielectric column 31 is made of the same material as the dielectric column 31, and care is taken so that there is not much difference in thermal expansion due to temperature changes at the screwed-in location and the insertion location.

If the adjustment member is inserted inside the dielectric column as in this configuration, the electromagnetic field distribution concentrated inside the dielectric column will be affected by the amount of insertion of the adjustment member, so the resonant frequency can be adjusted. Can be done. In addition, 36 in the figure is a loop antenna for external coupling.

As explained above, according to the present invention, the adjustment member is attached to the conductor cavity itself via the camp, so that the conductor cavity and the metal case enclosing it are not the cause of any problems. Even if a positional shift occurs, the insertion amount of the adjustment member into the conductor cavity does not change, and therefore the characteristics of the resonator device including the resonance frequency and degree of coupling do not change.

In addition, since the adjustment screw is housed inside the metal case, it has a simple appearance and is very easy to handle.

[Brief Description of the Drawings] Fig. 1 is a partial sectional view of a filter to which the present invention is applied;
FIG. 2 is an external perspective view of the conductor cavity, FIG. 3 is a sectional view showing another embodiment of the present invention, and FIG. 4 is a partially cutaway external view thereof.
FIG. 5 is a partial sectional view showing a conventional resonator device. 1). 33... Conductor cavity, 12... Metal case, 2
1.22.23...adjustment screw, 24,25.26...
- Hole, 27, 28, 29...cap. Patent applicant: Murata Manufacturing Co., Ltd. Figure 1 Figure 3 Figure 4 Figure 5

Claims (7)

[Claims] (1) A hole is drilled in the wall of the conductor cavity constituting the resonator, a cap with a screw hole is fitted into the hole, and an adjustment member with a male thread is screwed into the screw hole of the cap, and
A resonator device characterized in that the adjustment member is housed in a metal case enclosing a conductor cavity. (2) Claim (1) characterized in that the adjustment member is an adjustment screw that adjusts the resonant frequency of the resonator.
The resonator device described in section. (3) Claim (1) characterized in that the adjustment member is an adjustment screw that adjusts the degree of coupling between the resonators.
The resonator device described in section. (4) Claims (1) to (3) characterized in that the conductive cavity is a cavity resonator having a structure in which a metal film is formed on at least the inner surface of a casing made of a dielectric material. The resonator device according to any one of. (5) Resonance according to any one of claims (1) to (4), characterized in that at least one dielectric pillar is provided inside the conductor cavity. equipment. (6) Resonance according to any one of claims (1) to (5), characterized in that the adjustment member is inserted into a space within the conductor cavity through the cap. equipment. (7) Claims (1) to (5) characterized in that the adjustment member is inserted through the cap and into a dielectric column provided in the conductor cavity. The resonator device according to any one of.