JPH0528104U - Dielectric resonator device - Google Patents

Abstract

(57) [Summary] [Purpose] A dielectric resonator is housed in an outer case,
(EN) A dielectric resonator device having a small number of parts, a small size, and excellent electric characteristics. [Structure] A through hole is formed in a part of the cavity 12 and an outer case lower plate 7, respectively, and a cavity side bush 13 and an outer case side bush 1 are provided between the cavity and the outer case lower plate.
It is clamped by screwing in No. 4. Further, the outer case side bush 14 is screwed with the resonance frequency adjusting screw 16. [Effect] Since the outer case is attached to the cavity by the bush for holding the characteristic adjusting screw, the flange portion is not necessary and no special parts for mounting are required. This eliminates dead space, and since no unnecessary metal material protrusions are formed in the cavity,
There is no deterioration in the electrical characteristics of the resonator.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a dielectric resonator device in which a dielectric resonator having an internal dielectric inside a cavity is attached to an outer case.

[0002]

[Prior Art]

 The structure of a conventional dielectric resonator device is shown in FIGS. In FIG. 3, 2a and 2b are side plates of the cavity, and 3 and 4 are lower and upper plates of the cavity, respectively. Two side plates (not shown) are further provided in the depth direction of the paper, and these form a cavity. Reference numeral 1 is a columnar internal dielectric material arranged in the cavity. Resonance frequency adjusting screws 6 and 6 are provided on the side plate 2b through bushes 5 and 5. Further, 7 is a lower plate of the outer case, and the flange portion 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 opening peripheral edge of the outer case body is screwed to the peripheral edge of the lower plate 7. As a result, the dielectric resonator is housed in the outer case.

In the example shown in FIG. 4, a metal plate 10 is placed on an upper plate 4 of a dielectric resonator, two metal fittings 9 and 9 that engage with the metal plate 10 are provided, and the metal fitting 9 is attached. The flange portion is screwed to the lower plate 7 of the outer case with a screw 8.

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

[0005]

[Problems to be solved by the device]

 As described above, there are various structures for attaching the dielectric resonator to the outer case, but each structure has the following drawbacks.

That is, in any of the structures shown in FIGS. 3 to 5, a dead space is generated in the bottom surface portion of the outer case lower plate 7, and in the structures shown in FIGS. 3 and 4, the upper portion of the flange portion is used. Dead space also occurs. Therefore, there is a problem that the entire device becomes large even though the resonator unit itself is small. Further, in the structure shown in FIG. 3, the lower plate 3 with the flange portion has to be used, and since this has a different shape from the upper plate 4, the number of parts increases, and in the structure shown in FIG. There was a problem that fixing hardware with a complicated shape was required, the number of parts increased, and the manufacturing cost increased. Furthermore, in the structure shown in FIG. 5, the screw 8 for fixing the dielectric resonator to the lower plate 7 of the outer case projects into the cavity, and if the screw is made of metal, electrical characteristics such as intermodulation distortion are generated. Adversely affect. Even if a synthetic resin screw of about M3 is used as this screw, there will be a problem in strength.

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

[0008]

[Means for Solving the Problems]

 The dielectric resonator device of the present invention includes an internal dielectric, a through hole formed in a plane portion, a cavity accommodating the internal dielectric therein, an outer case having a through hole, and a through hole of the outer case. The hole and the through hole of the cavity are inserted together, and the cavity side bush and the outer case side bush that sandwich the cavity with the outer case by screwing are screwed to the cavity side bush or the outer case side bush, and the tip is attached. And a characteristic adjusting screw having a portion inserted into the cavity.

[0009]

In the dielectric resonator device of the present invention, the through hole is formed in each of the plane portion of the cavity and a part of the outer case that fixes 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 clamped 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. In this way, since the bush for supporting the characteristic adjusting screw is also used as the fixing member between the dielectric resonator and the external case, it is not necessary to provide a flange part in the cavity, and no fixing bracket is required. Becomes Moreover, if the cavity side bush is made of resin, it does not adversely affect the electrical characteristics of the dielectric resonator. Moreover, since the cavity side bush and the outer case side bush are sized to be screwed into the characteristic adjusting screw at the central portion, the cavity and the outer case are fixed with sufficient strength.

[0010]

【Example】

 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 is a columnar internal dielectric, and 12 is a rectangular cylindrical frame body integrally molded with the internal dielectric 1. Side plates (not shown) are attached to the two opening surfaces of the frame body 12, respectively. An Ag electrode film is formed around the frame 12 and on the inner surface or the outer surface of the two side plates, and the frame 12 and the two side plates form a cavity. Two through holes for inserting the cavity side bushes 13 are formed on the bottom surface of the frame body 12 in the figure. In FIG. 1, reference numeral 7 denotes a lower plate of the outer case, which has a through hole through which the cavity side bushes 13 are inserted at a position corresponding to the through hole on the cavity side. From the bottom surface side of the outer case lower plate 7, the outer case side bushes 14, 14 are screwed into the cavity side bushes 13, 13 so that the bottom surface part of the cavity (frame 12) and the outer case lower plate 7 together. It is sandwiched. In FIG. 1, 16a and 16b are resin resonance frequency adjusting screws, and 17a and 17b are dielectric rods attached to the tip of the resonance frequency adjusting screw 16. The resonance frequency adjusting screws 16a and 16b are screwed onto the inner peripheral surfaces of the outer case side bushes 14 and 14, respectively. The dielectric constant of the dielectric rod 17a is higher than that of the dielectric rod 17b, and rough 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 is a pipe nut for fixing the resonance frequency adjusting screws 16a and 16b. Further, in FIG. 1, reference numeral 18 denotes a main body of the outer case, and the peripheral edge portion of the opening is screwed by a screw 19 at the peripheral edge portion of the lower plate 7 of the outer case. With this configuration, the resonance frequency adjusting screw and a part of the bush thereof only 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 cross-sectional view showing the structure of the bush portion shown in FIG. As shown in FIG. 2, the outer case side bush 14 has a double screw structure, and the screw on the outer peripheral surface of the outer case bush 14 is screwed into the cavity side bush 13 so that the cavity (frame body 12) and the outer case can be secured. The lower plate 7 is sandwiched. The screw hole inside the outer case side bush 14 is screwed with the resonance frequency adjusting screw 16. By the rotation of the resonance frequency adjusting screw 16, the amount of insertion of the dielectric rod 17 attached to the tip of the screw 16 into the hole of the internal dielectric changes. The resonance frequency adjusting screw 16 is fixed by tightening the pipe nut 15 at a predetermined resonance frequency. As described above, since the cavity-side bush 13 is made of synthetic resin, the metal material does not project into the cavity, and the electrical characteristics (intermodulation distortion, etc.) of the dielectric resonator are not adversely affected. Further, since the outer case side bush 14 is made of metal, leakage of the electromagnetic field from the bush portion is prevented.

Although the single mode TM ₁₁₀ mode dielectric resonator is used as an example in the above-described embodiments, for example, in an orthogonal TM multiple mode dielectric resonator, coupling adjustment of an electromagnetic field between the resonators is performed. A coupling adjusting screw (metal screw) may be screwed into the bush.

[0013]

[Effect of the device]

 According to this invention, the cavity of the dielectric resonator can be attached to the outer case without using a part of the cavity as a flange portion and without using a mounting metal fitting having a flange portion. Therefore, the dead space that has conventionally been generated near the flange portion is eliminated, and the overall size can be easily reduced. In addition, the manufacturing cost is reduced because the number of parts is not increased by forming the flange. Furthermore, since no unnecessary protrusion of the metal material is formed in the cavity, the electrical characteristics of the dielectric resonator are not deteriorated.

[Brief description of 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 cross-sectional view of the 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-External Case Lower Plate 12-Frame (Part of Cavity) 13-Cavity Side Bush 14-External Case Side Bush 15-Pipe Nut 16-Resonance Frequency Adjusting Screw 17-Dielectric Rod 18- External case body 19-screw

Claims (1)

[Scope of utility model registration request] 1. An internal dielectric, a cavity having a through-hole formed in a flat surface portion and accommodating the internal dielectric therein, an external case having a through-hole, a through-hole of the external case and the cavity. A cavity-side bush and an outer-case-side bush that insert the through-holes together and hold the cavity with the outer case by screwing, and screw into the cavity-side bush or the outer-case-side bush so that the tip portion is inside the cavity. A dielectric resonator device consisting of an inserted characteristic adjustment screw.