Microwave low-band high-selectivity cavity dielectric filter and manufacturing method thereof

Abstract

The invention discloses a microwave low-band high-selectivity cavity medium filter and a manufacturing method thereof. The manufacturing method comprises designing the size of a cylindrical circular waveguide medium according to the index requirements, wherein the longitudinal direction of the circular waveguide medium is provided with frequency adjustment holes which are communicated in the longitudinal direction; heating the circular waveguide medium in a vacuum environment; generating circular waveguides after metal layer sputtering treatment is performed on the circular waveguide medium; enabling the circular waveguides to form the cavity medium filter. According to the microwave low-band high-selectivity cavity medium filter and the manufacturing method thereof, a metal layer is sputtered on a filling medium directly on the basis of the prior art that a circular waveguide resonator is filled with medium materials to enable the metal layer to coat the medium materials closely and accordingly an air layer which is formed between the metal layer and the filling medium is avoided, the occupied space of the metal layer is narrowed, filter indicators of the filter are ensured, and meanwhile the miniaturization purpose of the filter is achieved.

Description

technical field [0001] The invention relates to a microwave low-band high-selectivity cavity dielectric filter, which is a filter device suitable for radio frequency signal transmission in the field of radio communication and a manufacturing method thereof. Background technique [0002] In various modern wireless communication devices, filters, as a common component, play an increasingly important role in wireless information transmission technology. At present, microwave filters used in various wireless communication frequency bands are generally realized by coaxial transmission. It is usually composed of a resonant cavity, an inner conductor and corresponding tuning screws. When the performance index requires low loss and high power, the volume of the resonant cavity will increase accordingly, which will not only consume a lot of raw materials, but also manufacture and process it. The process puts forward higher requirements, and the realization of product temperature sta...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defect that the method of increasing the diameter in order to reduce the resonance frequency in the prior art does not meet the needs of miniaturization of the existing resonators. According to one aspect of the present invention, a microwave low-band high Manufacturing method of selective cavity dielectric filter

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