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TM-mode double-ended short circuit filter

A filter and double-ended technology, applied in waveguide-type devices, circuits, electrical components, etc., can solve the problems of increased cover processing cost, high medium temperature, poor contact, etc., and achieve the effect of simple structure, low cost, and reduced loss.

Inactive Publication Date: 2016-11-16
TONGYU COMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, processing errors and thermal expansion and contraction after heating and cooling lead to poor contact between the cover plate and the dielectric resonator, and the cavity and the dielectric resonator, which are prone to short-circuit failure and performance deterioration such as increased insertion loss.
The double-terminal short-circuit filter of the TM mode in the prior art usually realizes the double-terminal short-circuit of the dielectric resonator by welding or designing a special cover plate, and the welding method is likely to cause the local temperature of the medium to be high and cause fragmentation; the special design of the cover plate leads to Board processing costs increase and the process is complicated

Method used

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  • TM-mode double-ended short circuit filter
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  • TM-mode double-ended short circuit filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] see figure 1 , is a schematic diagram of a TM-mode double-terminal short-circuit filter provided in Embodiment 1 of the present invention. For ease of description, only parts related to the embodiments of the present invention are shown.

[0027] The TM mode double-terminal short-circuit filter includes: a cavity 101 , a cover plate 102 , a cover plate screw 103 , a tuning screw 104 , a screw lock nut 105 , a dielectric resonator 106 , an elastic pad 107 , and a metal layer 108 .

[0028] Wherein, the cover plate screw 103 cooperates with the screw hole on the cavity body 101 to fasten the cover plate 102 on the cavity body 101, and the cover plate 102 covers the cavity body 101 to form a resonant cavity. There is a boss 109 on the inner bottom surface of the cavity 101, and the boss 109 can be a cylindrical boss, and it can be understood that it can also be a boss of other shapes. The dielectric resonator 106 is disposed at the inner bottom of the cavity 101 and slee...

Embodiment 2

[0037] see image 3 , is a schematic diagram of a TM-mode double-terminal short-circuit filter provided in Embodiment 2 of the present invention. For ease of description, only parts related to the embodiments of the present invention are shown.

[0038] The second embodiment is basically the same as the first embodiment, except that the lower end surface of the dielectric resonator in the first embodiment directly contacts the inner bottom surface of the cavity, while the lower end surface of the dielectric resonator and the inner bottom surface of the cavity in the second embodiment There is an elastic pad 202 wrapped with a metal layer 201 similar to that in Embodiment 1; the diameter of the through hole of the elastic pad at the upper end of the dielectric resonator in Embodiment 1 is smaller than the diameter of the tuning screw, while the upper end of the dielectric resonator in Embodiment 2 The diameter of the through hole of the elastic pad is equal to the diameter of ...

Embodiment 3

[0042] see Figure 4 , is a schematic diagram of a TM-mode double-terminal short-circuit filter provided in Embodiment 3 of the present invention. For ease of description, only parts related to the embodiments of the present invention are shown.

[0043] The third embodiment is basically the same as the second embodiment, except that in the second embodiment, the metal layer wrapping the upper and lower elastic pads of the dielectric resonator is close to the surface of the elastic pad, including the large round end face, step surface, and large cylindrical surface of the elastic pad, However, in the third embodiment, the metal layer does not adhere to the large cylindrical surface of the elastic pad, and there is a certain gap therebetween. The metal layer can be in the shape of "<" at the side of the elastic pad, and can also be in the shape of an arc or other shapes, so that there is a certain gap between the metal layer on the side of the elastic pad and the side of the e...

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Abstract

The invention discloses a TM-mode double-ended short circuit filter, which comprises a cavity, a cover plate, a tuning screw rod, a dielectric resonator, an elastic cushion and a metal layer. By utilizing flexible components of the elastic cushion and the like, the metal layer for playing a short circuit role can be fully and well laminated on the end surface of the dielectric resonator, the inner surface of the cover plate and the bottom surface of the cavity, so that the intermodulation performance is greatly improved and the loss is reduced. Meanwhile, the cover plate and the cavity are simple in structure and easy to process. The materials of rubber, plastic and the like can be utilized by the elastic cushion, so that the materials are easy to obtain, the cost is low and the structure is simple and convenient to process. Therefore, according to the TM-mode double-ended short circuit filter disclosed by the invention, processing and assembling processes are simple, the cost is low, and a short circuit is reliable and easy to implement.

Description

【Technical field】 [0001] The invention relates to the technical field of communication equipment, in particular to a TM-mode double-terminal short-circuit filter. 【Background technique】 [0002] The filter is a frequency filtering device, which selects the signal of the required frequency band and suppresses the signal of the unnecessary frequency band. The filter is widely used in radio frequency, microwave and other communication fields. Among them, the traditional metal coaxial cavity filter The device technology is mature and the most widely used. However, the metal coaxial cavity filter usually has a large volume and loss, cannot obtain a high Q value (quality factor), and its performance changes greatly due to temperature. At present, the TM-mode double-terminal short-circuit resonator can be miniaturized, but due to the unreliable double-terminal short-circuit method, its performance is also unstable, and even deteriorates to failure over time. The two ends of the T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01P1/207
CPCH01P1/207
Inventor 蔡辉梁宇栋符其略蔡文新杨业浩许兵
Owner TONGYU COMM INC
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