JPH0528103U - Dielectric resonator - Google Patents

Abstract

(57) [Summary] [Object] To provide a dielectric resonator which eliminates dead space and can be easily fixed in a case or the like without deteriorating electrical characteristics. [Structure] Chamfers 12 are formed on the ridges of the four side surfaces of the cavity, and screw holes 11 are formed at the four corners of the lower plate 4. [Effect] Since the flange is not formed on the lower plate 4, the dead space is eliminated, and the fixing screw exists outside the cavity, so that the electrical characteristics of the dielectric resonator are not adversely affected.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 This invention relates to a dielectric resonator having an internal dielectric arranged in a cavity.

[0002]

[Prior Art]

 When a filter device or the like is formed using a TM mode or TE mode dielectric resonator, the dielectric resonator is housed in a case. The mounting structure of the dielectric resonator to the case has various types depending on the shape of the dielectric resonator and the signal input / output method. Typical examples are shown in FIGS. 4 and 5. 4 is a top view and FIG. 5 is a front view. In both figures, 1 is a prismatic internal dielectric, 2 is a rectangular tubular frame integrally formed with this internal dielectric, and 3 and 4 are upper and lower plates that cover two opening surfaces of the frame 2. Is. As shown in the figure, the lower plate 4 is formed to be longer than the upper plate 3 in one direction, and its protruding portion serves as a flange portion. The frame 2 and the upper and lower plates 3 and 4 form a cavity of the dielectric resonator. Reference numeral 7 is a case lower plate, and 6 is a support for attaching a cavity to the case lower plate 7. In this example, the cavity of the dielectric resonator is placed on the case lower plate 7 via the support base 6, and the flange portion of the cavity is fixed to the case lower plate by the plane nut 5 and the screw 8. Reference numeral 9 is a junction box to which the transmission line is connected, and 10 is a coupling loop protruding from the junction box 9 into the cavity of the dielectric resonator.

[0003]

[Problems to be solved by the device]

 However, in the dielectric resonator, since the flange is provided in a part of the cavity, it is not possible to place another resonator in the vicinity of the flange, and dead space occurs. It also requires special mounting hardware such as plain nuts. It is possible to adopt a structure in which the cavity is not provided with a flange portion and is screwed inside the lower plate of the cavity, but if metal screws are used, unnecessary metal members will protrude into the cavity, causing intermodulation distortion, etc. It adversely affects the electrical characteristics of the resonator.

An object of the present invention is to provide a cavity for a dielectric resonator without using a flange portion, without using a special fixing metal fitting, and without providing a fixing member in the cavity, so that it can be easily attached to a case or the like. It is to provide a dielectric resonator that can be fixed.

[0005]

[Means for Solving the Problems]

 This invention relates to a dielectric resonator in which an internal dielectric is arranged in a substantially hexahedral cavity, wherein chamfered portions or roundness are formed at the ridges of the four side surfaces of the cavity, and the cavity perpendicular to the four side surfaces is formed. Is characterized in that holes for screwing are formed at four corners of the flat plate.

[0006]

[Action]

 In the dielectric resonator of the present invention, the cavity has a substantially hexahedral shape, and the chamfered portions or roundness are formed on the ridges of the four side surfaces of the cavity. A hole is formed. Therefore, when fixing this dielectric resonator to a case or the like, it can be screwed through the screw holes provided at the four corners of the flat plate. Since the flange portion is not formed in the cavity as described above, a dead space is not formed, and the entire device can be downsized.

[0007]

【Example】

 The structure of the dielectric resonator of this invention is shown in FIGS.

FIG. 1 is a perspective view showing a structure of a dielectric resonator placed on a support, FIG. 2 is a top view of the dielectric resonator, and FIG. 3 is a case where the dielectric resonator is provided in a case. It is a partial front view of a dielectric resonator device. In FIG. 1, 2 is a cylindrical frame, and 3 and 4 are an upper plate and a lower plate that cover two opening surfaces of the frame 2. Chamfered portions 12 are formed at the four ridges of the frame body 2 and the four corners of the upper plate 3. Screw holes 11 are formed at the four corners of the lower plate 4. The frame 2 and the upper and lower plates 3 and 4 form a cavity of the dielectric resonator.

The dielectric resonator thus constructed is placed on the upper part of the support 6 and fixed to a case lower plate or the like as described later.

As shown in FIGS. 2 and 3, a quadrangular prism internal dielectric 1 is arranged inside the cavity. The internal dielectric 1 is integrally molded with the frame 2. An Ag electrode film is formed on the outer peripheral surface of the frame body 2 and the inner or outer surfaces of the upper and lower plates 3 and 4, and the TM ₁₁₀ mode dielectric resonator is constituted by the cavity and the internal dielectric.

In FIG. 3, reference numeral 7 denotes a case lower plate, and the support base 6 is previously fixed to a predetermined portion thereof by screwing or the like. Reference numeral 13 is a screw for fixing the cavity of the dielectric resonator on the support 6. Incidentally, 9 is a junction box to which a transmission cable is connected, and 10 is a coupling loop projecting from the junction box 9 into the cavity. In this way, the dielectric resonator can be mounted without providing a flange portion in the cavity of the dielectric resonator and without protruding an unnecessary fixing member into the cavity.

In the embodiment, the single mode TM mode dielectric resonator is taken as an example, but the present invention is also applicable to the orthogonal TM multimode dielectric resonator and the TE mode dielectric resonator. Can be applied to.

Further, in the embodiment, the chamfered portion is formed on the ridges on the four side surfaces of the cavity, but the chamfered portion may be rounded to secure a space for forming the screwing hole.

[0014]

[Effect of the device]

 According to this invention, since the cavity of the dielectric resonator can be fixed to the case without providing the flange portion, the dead space is eliminated, and the dielectric resonator device is reduced in size as a whole. can do. Moreover, since no special metal fixtures for fixing are required, the number of parts and the manufacturing cost can be reduced. Furthermore, since the fixing member does not project into the cavity, the electric characteristics of the dielectric resonator are not adversely affected.

[Brief description of drawings]

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

FIG. 2 is a top view of a dielectric resonator.

FIG. 3 is a front view of a dielectric resonator fixed in a case.

FIG. 4 is a top view showing a structure of a conventional dielectric resonator.

FIG. 5 is a front view showing the structure of a conventional dielectric resonator.

[Explanation of symbols]

 1-Inner Dielectric 2-Frame 3 -Upper Plate 4-Lower Plate 6-Supporting Base 7-Case Lower Plate 9-Junction Box 10-Coupling Loop 11-Screw-Hole 12-Chamfer

Claims (1)

[Scope of utility model registration request] 1. A dielectric resonator in which an internal dielectric is arranged in a substantially hexahedral cavity, wherein chamfered portions or roundness are formed at the ridges on the four side surfaces of the cavity, and the cavities perpendicular to the four side surfaces are formed. A dielectric resonator characterized in that holes for screwing are formed at four corners of a flat plate of a cavity.