JPH0644166Y2 - Microwave resonator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a microwave resonator such as a dielectric resonator or a cavity resonator, and more particularly to a structure for fixing the cavity thereof.

[Conventional technology]

FIG. 3 is a side view showing an example of a conventional microwave resonator.

This microwave resonator is an example in the case of a TE _{01 δ} mode dielectric resonator, in which a dielectric 6 is housed in a cavity 2 and is supported by a support 8 made of an insulator.

The cavity 2 is composed of a cover 2a having an opening and a bottom plate 2b for covering the same, both of which are metallized (that is, a metal film is formed) on the entire surface of ceramics. The cover 2a and the bottom plate 2b In the past, silver has been conventionally adhered to each other by baking silver on the joint surface 4 of both of them, thereby performing electrical connection and mechanical fixing between the both.

It should be noted that the cavity 2 is formed by metallizing the surface of the ceramics because the supporting body 8 of the dielectric 6 inside is also usually made of ceramics, and thus the linear expansion of the two is different from the cavity made of metal. This is because the coefficients can be made close to each other, which can prevent a decrease in temperature characteristics, mechanical strength, and the like.

[Problems to be solved by the device]

However, in the above microwave resonator, high temperature baking of the cavity 2 is necessary to bond the cover 2a and the bottom plate 2b to each other with silver. Therefore, equipment such as a heating furnace is required, and it takes time for baking. This has been a cause of increasing the cost of the microwave resonator.

Then, this invention aims at providing the microwave resonator which improved such a point.

[Means for Solving the Problems]

The microwave resonator of the present invention comprises a cover having a flange portion around the opening and a bottom plate for covering the same, and a cavity constituted by a metallized ceramic surface is placed on the mounting plate, The structure is such that an annular metal rod is placed on the part and the metal rod is pressed by a plurality of leaf springs attached to a mounting plate.

[Action]

According to the above structure, the cavities and the like are fixed on the mounting plate by the plurality of leaf springs, and the flange portion of the cavity and the bottom plate are pressed against each other by the cooperation of the leaf springs and the metal rods. Electrical connection and mechanical fixing between the two are performed.

〔Example〕

1 is a side view showing a microwave resonator according to an embodiment of the present invention, and FIG. 2 is a plan view of the microwave resonator shown in FIG.

This microwave resonator is also an example in the case of a TE _{01 δ} mode dielectric resonator similar to the conventional example, and has a bottomed cylindrical cover 12a having a ring-shaped flange portion 13 around the opening and its lid. The cavities 12 are made of a disk-shaped bottom plate 12b, and both are made of, for example, ceramics such as alumina whose entire surface is metallized with silver.

On this bottom plate 12b, a dielectric 1
6, the bottom plate 12b is placed on the mounting plate 26, the cover 12a is placed on the bottom plate 12b, and the annular metal rod 20 is placed on the flange 13 of the cover 12a.

The mounting plate 26 may be, for example, a part of a metal case that houses the microwave resonator or the like, or may be another metal plate or a member other than the metal plate. Also a metal rod 20
Shows a C-ring shape with a part cut off,
Otherwise, it may be an O-ring shape, and its cross-sectional shape is not limited to a circle and may be a square or the like.

Then, by pressing the metal rod 20 from above with a plurality of (four in the illustrated example) leaf springs 22 attached to the attachment plate 26 by screws 24, the cavities 12 and the like are attached.
26 and the plate spring 22 and the metal rod 20 cooperate to press the flange portion 13 of the cavity 12 and the bottom plate 12b into contact with each other, thereby electrically connecting and mechanically fixing the cover 12a and the bottom plate 12b. And is doing. However, the number of leaf springs 22 is not limited to four.

Reference numeral 28 in FIG. 1 denotes an input / output connector mounted on the mounting plate 26, and a loop conductor (not shown) extending into the cavity 12 from the connector is magnetically coupled between the dielectric 16. .

According to the above structure, the cover 12a of the cavity 12
Since there is no need for conventional high temperature baking to electrically connect and mechanically fix between the bottom plate 12b and the bottom plate 12b, equipment such as a heating furnace is not necessary and the assembly time is shortened.
As a result, the cost of the microwave resonator can be reduced.

Moreover, according to the above structure, since the pressing force of the leaf spring 22 is dispersed by the metal rod 20 and the flange portion 13 can be evenly pressed on its circumference, the flange portion 13 whose base material is ceramics is used. It is possible to prevent cracks, chips, etc. from occurring on the flange part 13 and the bottom plate 12.
The adhesiveness with b can be improved. Therefore, from this point of view, it is preferable to use a metal rod 20 that is tough to some extent so that it is not deformed only at the place where it is pressed by the leaf spring 22.

Further, since the leaf spring 22 is used, the change in the pressing force due to the temperature change can be absorbed by the elastic force, so that stable fixing can be performed even with the temperature change. Therefore, from this point, it is preferable to use a thin leaf spring having large elasticity as the leaf spring 22.

Incidentally, the structure as described above is not limited to a resonator of a specific resonance mode, but a dielectric resonator of TE mode or TM mode other than TE _01δ described above, and further, a dielectric inside the cavity 12. It can also be widely applied to a cavity resonator not having 16.

[Effect of device]

As described above, according to the present invention, there is no need for equipment such as a heating furnace because high-temperature baking unlike the conventional case is unnecessary for electrically connecting and mechanically fixing the cavity cover and the bottom plate. In addition, the assembly time is shortened, and as a result, the cost of the microwave resonator can be reduced.

[Brief description of drawings]

FIG. 1 is a side view showing a microwave resonator according to an embodiment of the present invention. FIG. 2 is a plan view of the microwave resonator shown in FIG. FIG. 3 is a side view showing an example of a conventional microwave resonator. 12 ... cavity, 12a ... cover, 12b ... bottom plate, 13 ...
… Flange, 16 …… Dielectric, 20 …… Metal rod, 22 …… Leaf spring, 26 …… Mounting plate.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeji Arakawa 2 26-10 Tenjin Tenjin, Nagaokakyo-shi, Kyoto Murata Manufacturing Co., Ltd. (56) References JP-A-60-102 (JP, A) JP-A Sho 55-85101 (JP, A) Actual development Sho 59-127309 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A cavity having a cover having a flange portion around an opening and a bottom plate for covering the cover, both of which are formed by metallizing the surface of ceramics, is placed on a mounting plate, and an annular shape is formed on the flange portion. A microwave resonator having a structure in which the metal rod is placed and the metal rod is held down by a plurality of leaf springs attached to a mounting plate.