Dielectric filter with high harmonic rejection

By setting vertically penetrating isolation slots in the dielectric filter and covering them with a metallization layer, signal isolation is enhanced, solving the problem of poor harmonic characteristics of dielectric filters in high harmonic suppression scenarios, and achieving optimized harmonic suppression and improved application performance.

CN122246444APending Publication Date: 2026-06-19CHINA ELECTRONICS TECH GRP NO 26 RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ELECTRONICS TECH GRP NO 26 RES INST
Filing Date
2026-04-22
Publication Date
2026-06-19

AI Technical Summary

Technical Problem

Existing dielectric filters have poor harmonic characteristics in scenarios requiring high harmonic suppression, necessitating the design of a dielectric filter that can improve harmonic suppression.

Method used

A vertical isolation groove penetrating the dielectric body is set between the input resonator and the output resonator of the dielectric filter, and a metallization layer is covered on the bottom and walls of the groove to enhance signal isolation and reduce the amplitude of harmonic signals.

Benefits of technology

By enhancing signal isolation, the harmonic suppression effect is optimized, improving the application effect of the filter, and it also has the advantages of miniaturization, good temperature characteristics, good power tolerance, low cost and manufacturing consistency.

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Abstract

This invention relates to a dielectric filter with high harmonic suppression, comprising a dielectric body, on which are disposed an input metal electrode, an output metal electrode, an input resonator coupled to the input metal electrode, an output resonator coupled to the output metal electrode, and multiple intermediate resonators. The input resonator and the output resonator are adjacent, and an isolation groove vertically penetrating the top and bottom surfaces of the dielectric body is disposed between the input and output resonators. In this invention, by adding an isolation groove between the input and output resonators, the isolation effect between the input and output signals is enhanced, thereby reducing the amplitude of the filter's harmonic signals, optimizing harmonic suppression, and improving application performance. It has many advantages such as miniaturization, good temperature characteristics, good power handling capacity, low cost, and high manufacturing consistency; its structure is simple and its practicality is strong.
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