Harmonic-suppression differential band-pass filter

Abstract

The invention discloses a harmonic-suppression differential band-pass filter based on mixed media and an coaxial resonator and solves the problem that a differential filter based on a dielectric resonator in the prior art has poor harmonic wave performance such as a low differential mode stop band width and a low common mode rejection level. The filter disclosed by the invention comprises a metal chamber, two dielectric resonators and one coaxial resonator, two differential excitation structures and multiple microwave coaxial joints, wherein the two differential excitation structures are firmly disposed beside the two dielectric resonators respectively, have a one-to-one correspondence relation, and carry out excitation coupling with the two dielectric resonators according to the Ampere's right handed screw rule; the multiple microwave coaxial joints are disposed on the outer wall of the metal chamber, connected to the two differential excitation structures and used for connection with external communication equipment; and one of the two differential excitation structures is a differential excitation signal input structure, and the other differential excitation structure is a differential excitation signal output structure. The filter disclosed by the invention can improve harmonic wave performance of the differential filter based on the dielectric resonator, which is specifically embodied in increase of the differential mode stop band width and the common mode rejection level.

Description

technical field [0001] The invention relates to the technical field of radio frequency communication filtering, in particular to a harmonic suppression differential bandpass filter based on a mixed medium and a coaxial resonator. Background technique [0002] In recent decades, dielectric resonators have been more and more widely used in various microwave components and subsystems due to their superior characteristics such as high quality factor value (Q), low manufacturing cost, and high temperature stability, especially in high-performance bands. in the pass filter. However, due to the crowded resonance modes of the dielectric resonator, the distance between the undesired harmonic mode and the required operating mode is relatively close, resulting in poor harmonic characteristics of the dielectric filter. However, many communication systems require filters capable of second or third harmonic mode rejection. [0003] At present, in order to improve the harmonic performanc...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem of poor harmonic performance of the differential filter based on the dielectric resonator existing in the prior art, such as the low level of differential mode stop band and common mode suppression, and provides a harmonic suppression differential bandpass filter , which can improve the harmonic performance of a differential filter based on a dielectric resonator, specifically by increasing its differential-mode stopband width and common-mode rejection level

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