Medium filter

Abstract

The invention relates to a medium filter, which comprises a cavity (210) and a medium resonator (220), wherein the medium resonator (220) is fixed on the cavity (210); the medium resonator (220) comprises a columnar medium body; the middle of the medium resonator (220) is provided with a through hole (222); one end face of the columnar medium body is provided with an end face electrode (223) and a coupling electrode (224); the end face electrode (223) is positioned around the through hole (222); the coupling electrode (224) is separated from the end face electrode (223); the outer surface (225) of the columnar medium body is covered by a protective layer (25), a metal layer (226), the end face electrode (223) and the coupling electrode (224); the protective layer (225) is positioned on the end face of the columnar medium body which is provided with the end face electrode (223) and the coupling electrode (224); and the metal layer (226) is covered on the peripheral surface of the columnar medium body, and is separated from the coupling electrode (224). The medium filter is easy for realizing transmission zero points, out-of-band rejection is increased, and the Q value is increased.

Description

【Technical field】 [0001] The invention relates to the field of microwave communication, in particular to a dielectric filter. 【Background technique】 [0002] Filters are key components in various mobile communication systems and are used to filter out clutter or interference signals outside the frequency of communication signals. The continuous improvement of the performance of the communication system puts forward higher requirements for the filter, which requires the filter to have low loss, small size and light weight. TEM mode dielectric filters can be made very small because they can use dielectric materials with high dielectric constants, and are widely used in various devices. [0003] The existing TEM (transverse electromagnetic) mode dielectric filter is generally assembled with a single silver electrode, such as figure 1 As shown, the single-electrode filter has many disadvantages in practical applications, and cannot meet the performance and reliability requirem...

AI Technical Summary

Problems solved by technology

[0003] The existing TEM (transverse electromagnetic) mode dielectric filter is generally assembled with a single silver electrode, such as figure 1 As shown, the single-electrode filter has many disadvantages in practical applications, and cannot meet the performance and reliability requirements at the same time

The silver electrode filter has a single design method, which cannot achieve diversity, is difficult to achieve transmission zero point, poor out-of-band suppression, low Q value, high processing accuracy requirements, difficult debugging, and difficult to meet the high performance requirements of the filter

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