Two-end-grounded TM (Transverse Magnetic) mode medium resonator

Abstract

The invention discloses a two-end-grounded TM (Transverse Magnetic) mode medium resonator, which comprises a medium resonant post, a metal resonant cavity and a cover plate, wherein the medium resonant post is positioned in the metal resonant cavity; the lower end face of the medium resonant post is contacted with the bottom surface of the metal resonant cavity; and the cover plate is positioned on the metal resonant cavity. The TM mode medium resonator is characterized in that: a conducting elastomer gasket is arranged between the upper end face of the medium resonant post and the cover plate, and is pre-stressed between the medium resonant post and the cover plate. In the invention, the conducting elastomer gasket is adopted, and is particularly pre-stressed between the medium resonant post and the cover plate, so that tight contact between the medium resonant post and the metal resonant cavity is ensured by the resilience force of the pre-stressed conducting elastomer gasket, uninterrupted transmission of current is ensured, current leakage can be effectively prevented, the performance of the TM mode medium resonator is improved, and the size of the entire medium resonator is reduced.

Description

technical field [0001] The invention relates to a passive antenna feeder in the field of wireless network communication, in particular to a TM-mode dielectric resonator grounded at both ends. Background technique [0002] For a long time, filters have played an extremely important role in the processing of electronic signals. It has the function of filtering signals of used frequencies and suppressing interference signals. With the rapid development of microwave wireless communication and the shortage of frequency band resources, higher and higher requirements are put forward for the performance and volume of filters. Traditional metal cavity filters can no longer meet these requirements, so we want to use TM mode dielectric resonators. To improve the performance of the oscilloscope and reduce its size. [0003] The TM mode dielectric resonator has two ways of single-ended grounding and double-ended grounding to achieve filtering performance. Under the same performance, th...

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Problems solved by technology

However, since the expansion coefficient of the ceramic resonator is very different from that of metal, the reliability of this installation method is very poor:

[0005] 1. The contact resistance between the bottom of the dielectric and the bottom plate of the metal cavity increases at high and low temperatures, and the performance decreases

[0006] 2. After multiple rounds of high and low temperature changes, the resonator is damaged or broken due to stretching and extrusion beyond its own expansion coefficient, resulting in unstable resonance frequency and Q value, making the filter (duplexer) abnormal Work

[0007] Therefore, the above-mentioned TM mode dielectric filter (duplexer) is difficult to promote in the market

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