Dielectric filter convenient for adjusting frequency and coupling bandwidth

Abstract

The invention discloses a dielectric filter convenient for adjusting frequency and coupling bandwidth, and the problems of the prior art such as inability of facilitating actual operation, complicated debugging technology, and low efficiency are solved. The dielectric filter comprises a filter body, which is provided with a radio frequency connector. The filter body comprises a plurality of dielectric single cavities, which all made of hard ceramic dielectric materials, and a plurality of coupling windows, and the adjacent dielectric single cavities are connected together by the coupling window, and in addition, the dielectric single cavities and the coupling windows are provided with blind holes. According to a resonant cavity perturbation theory, by changing the sizes of the blind holes of the dielectric single cavities, the frequencies of the dielectric single cavities are adjusted; and by changing the sizes of the blind holes of the coupling windows, coupling quantities among the dielectric single cavities are adjusted. The dielectric filter has advantages of high stability, low loss, light weight, low costs, small size, simple assembly, and ability of facilitating tuning of the same plane.

Description

technical field [0001] The invention relates to the field of filters, in particular to a dielectric filter which is convenient for adjusting frequency and coupling bandwidth. Background technique [0002] A filter is a frequency-selective device that allows specific frequency components in a signal to pass while greatly attenuating other frequency components. The waveguide filter is one of the filters used in communication systems, while the traditional waveguide filter is a metal cavity structure with air in the middle, and metal materials as the edges to play the role of electromagnetic shielding and structural support. The filter using this method has a higher Q value, but its volume and weight are relatively large, which is not conducive to installation and transportation. With the development of communication systems, filters are required to have the characteristics of low insertion loss, high rejection, high power withstand, low cost, and miniaturization. [0003] In...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the dielectric waveguide filter generally changes the resonant frequency of the dielectric single cavity mainly by changing the size of the dielectric single cavity; mainly changes the coupling amount between the dielectric single cavities by changing the size of the coupling window; at the same time, the resonance frequency and the coupling amount will affect each other

Such a filter tuning method not only needs to remove a large range, which is not conducive to actual operation, but also requires a very complicated debugging process and low efficiency for different filter cavity modes.

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