JP2555715Y2 - Dielectric resonator device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dielectric resonator device in which a dielectric resonator having an internal dielectric in a cavity is attached to an outer case.

[0002]

2. Description of the Related Art The structure of a conventional dielectric resonator device is shown in FIGS.
As shown in FIG. In FIG. 3, reference numerals 2a and 2b denote side plates of the cavity, and reference numerals 3 and 4 denote lower and upper plates of the cavity, respectively. Two side plates (not shown) are further provided in the depth direction of the paper surface, and these constitute a cavity. Reference numeral 1 denotes a columnar internal dielectric disposed in the cavity. The side plate 2b is provided with resonance frequency adjusting screws 6 and 6 via bushes 5 and 5, respectively. Reference numeral 7 denotes a lower plate of the outer case. The flange of the lower plate 3 of the cavity is fixed to the lower plate 7 of the outer case by screws 8. The outer case body (not shown) covers the entire dielectric resonator from above, and the peripheral edge of the opening of the outer case body is screwed to the peripheral edge of the lower plate 7. Thus, the dielectric resonator is housed in the outer case.

In the example shown in FIG. 4, an upper plate 4 of a dielectric resonator is used.
A metal plate 10 is placed on top of the metal plate 10, and two metal fittings 9 and 9 are provided for engaging with the metal plate 10. The metal fitting 9 is screwed to the lower plate 7 of the outer case with a screw 8 at its flange portion. I have.

In an example shown in FIG. 5, a lower plate 3 of a dielectric resonator is provided.
Is screwed directly to the lower plate 7 of the outer case with screws 8. Reference numeral 11 denotes a driver hole for mounting the screw 8.

[0005]

As described above, there are various mounting structures of the dielectric resonator to the outer case, but all of the structures have the following disadvantages.

That is, in any of the structures shown in FIGS. 3 to 5, a dead space is formed on the bottom surface of the outer case lower plate 7, and in the structures shown in FIGS. Also produces dead space. For this reason, there is a problem that the entire device becomes large in spite of the small size of the resonator itself. Further, in the structure shown in FIG. 3, the lower plate 3 with a flange portion must be used, and since the lower plate 3 has a shape different from that of the upper plate 4, the number of parts increases, and even in the structure shown in FIG. There is a problem that a fixing fitting having a complicated shape is required, the number of parts is increased, and the manufacturing cost is increased. Further, in the structure shown in FIG. 5, a screw 8 for fixing the dielectric resonator to the outer case lower plate 7 protrudes into the cavity. If the screw is made of metal, electrical characteristics such as intermodulation distortion can be obtained. Adversely affect Even if a synthetic resin screw of about M3 is used as this screw, a problem occurs in strength.

An object of the present invention is to provide a dielectric resonator device in which a dielectric resonator is mounted on an outer case without using a flange portion and without providing a metal screw in a cavity.

[0008]

According to the dielectric resonator device of the present invention, an internal dielectric, a through-hole formed in a plane portion, a cavity accommodating the internal dielectric therein, and a through-hole are formed therein. An outer case, a cavity-side bush and an outer case-side bush that are inserted through the through-hole of the outer case and the through-hole of the cavity, and clamp the outer case and the cavity by screwing; And a characteristic adjusting screw screwed into the bush and having a tip portion inserted into the cavity.

[0009]

In the dielectric resonator device of the present invention, through holes are respectively formed in the plane portion of the cavity and in a part of the outer case for fixing the cavity. The cavity-side bush and the outer-case-side bush are inserted through the through-hole of the outer case and the through-hole of the cavity, and are held therebetween by screwing. Further, a characteristic adjusting screw is screwed into the cavity-side bush or the outer case-side bush, and the characteristic of the dielectric resonator is adjusted by inserting and removing the adjusting screw into and from the cavity. As described above, since the bush for supporting the characteristic adjusting screw is used as a fixing member between the dielectric resonator and the outer case, it is not necessary to provide a flange portion in a part of the cavity, and a fixing bracket is not required. Become. Moreover, if the cavity-side bush is made of resin, the electrical characteristics of the dielectric resonator are not adversely affected.
In addition, since the cavity-side bush and the outer case-side bush are large enough to be screwed into the characteristic adjusting screw at the center, the cavity and the outer case are fixed with sufficient strength.

[0010]

1 and 2 show the structure of a dielectric resonator device according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a columnar internal dielectric, and 12 denotes a square cylindrical frame integrally formed with the internal dielectric 1. Side plates (not shown) are attached to the two opening surfaces of the frame 12, respectively. An Ag electrode film is formed around the frame 12 and on the inner surface or outer surface of the two side plates, and a cavity is formed by the frame 12 and the two side plates. Two through holes for inserting the cavity-side bushes 13 are formed in the bottom surface of the frame 12 in the drawing. In FIG. 1, reference numeral 7 denotes an outer case lower plate having a through hole through which the cavity bushings 13 are inserted at positions corresponding to the through holes on the cavity side. From the bottom side of the outer case lower plate 7, the outer case side bushes 14, 14 are connected to the cavity side bushes 13, 13.
, And the bottom surface of the cavity (frame body 12) and the outer case lower plate 7 are sandwiched together. In FIG. 1, reference numerals 16a and 16b denote resonance frequency adjusting screws made of resin, respectively, and reference numerals 17a and 17b denote dielectric rods attached to the tip of the resonance frequency adjusting screw 16, respectively. The resonance frequency adjusting screws 16a and 16b are screwed to the inner peripheral surfaces of the outer case side bushes 14 and 14, respectively. The dielectric constant of the dielectric rod 17a is
It is higher than the dielectric constant of the dielectric rod 17b, and coarse adjustment can be performed by adjusting the resonance frequency adjusting screw 16a, and fine adjustment can be performed by the resonance frequency adjusting screw 16b. Reference numeral 15 denotes a pipe nut for fixing the resonance frequency adjusting screws 16a and 16b. In FIG. 1, reference numeral 18 denotes an outer case main body, and the peripheral edge of the opening is screwed to the peripheral edge of the outer case lower plate 7 with screws 19. With such a configuration, only the resonance frequency adjusting screw and a part of the bush thereof appear on the bottom surface of the outer case lower plate 7, and the dead space in that part is eliminated.

FIG. 2 is a partial sectional view showing the structure of the bush portion shown in FIG. As shown in FIG. 2, the outer case bush 14 has a double screw structure, and a screw on the outer peripheral surface of the outer case bush 14 is
By screwing with 3, the cavity (frame body 12) and the outer case lower plate 7 are sandwiched. External case side bush 14
Are screwed into the resonance frequency adjusting screw 16. The rotation of the resonance frequency adjusting screw 16 changes the amount of insertion of the internal dielectric into the hole of the dielectric rod 17 attached to the tip of the screw. The resonance frequency adjusting screw 16 is fixed by tightening the pipe nut 15 with the predetermined resonance frequency. As described above, since the cavity-side bush 13 is made of synthetic resin, the metal material does not protrude into the cavity, and does not adversely affect the electrical characteristics (intermodulation distortion and the like) of the dielectric resonator. Further, since the outer case-side bush 14 is made of metal, leakage of the electromagnetic field from the bush portion is prevented.

[0012] Although an example of the TM ₁₁₀ mode dielectric resonator of the single-mode in the embodiment shown above, for example, in the orthogonal TM multiple-mode dielectric resonator, a coupling adjustment of the electromagnetic field between the resonators A screw (metal screw) for adjusting the connection may be screwed into the bush.

[0013]

According to the present invention, the cavity of the dielectric resonator can be mounted on the outer case without using a part of the cavity as a flange portion and without using a fitting having the flange portion. . For this reason, the dead space which has conventionally occurred near the flange portion is eliminated, and the whole can be easily reduced in size. Further, there is no increase in the number of parts due to the formation of the flange portion, and the manufacturing cost is reduced. Further, since unnecessary protrusions of the metal material are not formed in the cavity, the electrical characteristics of the dielectric resonator are not deteriorated.

[Brief description of the drawings]

FIG. 1 is a diagram showing a structure of a dielectric resonator device according to an embodiment of the present invention.

FIG. 2 is a partial sectional view of a main part shown in FIG.

FIG. 3 is a diagram showing a structure of a conventional dielectric resonator device.

FIG. 4 is a diagram showing a structure of a conventional dielectric resonator device.

FIG. 5 is a diagram showing a structure of a conventional dielectric resonator device.

[Explanation of symbols]

 1-Inner Dielectric 7-Outer Case Lower Plate 12-Frame (Part of Cavity) 13-Cavity Side Bush 14-Outer Case Side Bush 15-Pipe Nut 16-Resonance Frequency Adjustment Screw 17-Dielectric Bar 18- Outer case body 19-screw

Claims (1)

(57) [Scope of request for utility model registration] An inner dielectric, a through hole formed in a plane portion, and a cavity accommodating the inner dielectric therein; an outer case having a through hole formed therein; a through hole of the outer case; A through-hole is inserted together, and a cavity-side bush and an outer-case-side bush that sandwich the outer case and the cavity by screwing are screwed into the cavity-side bush or the outer-case-side bush, and a distal end portion is inserted into the cavity. A dielectric resonator device comprising a characteristic adjustment screw inserted.