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CN115579602BActive Publication Date: 2026-05-26COMBA RF TECH GUANGZHOU LTD +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
COMBA RF TECH GUANGZHOU LTD
Filing Date
2022-10-25
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

In traditional straight-line cavity filters, excessively long metal probes can cause harmonic problems, affecting the filter's passband.

Method used

The design employs four resonant cavities and coupling plates arranged in parallel. The second and third plates, located at both ends of the first plate, are grounded to the inner cavity wall of the resonant cavity to achieve cross coupling, thus avoiding the influence of the coupling plate's own resonant frequency on the filter's passband. The fourth plate is used to adjust the zero point height to achieve symmetrical double zero points.

Benefits of technology

This achieves the beneficial effect of symmetrical double zeros in the filter, avoids the influence of the coupler resonant frequency on the passband, and adjusts the zeros to achieve a balanced state.

✦ Generated by Eureka AI based on patent content.

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  • Figure CN115579602B_ABST
    Figure CN115579602B_ABST
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Abstract

This application relates to the field of filtering device technology, and provides a filter comprising four resonant cavities, four resonators, and a coupling plate arranged side-by-side. The four resonant cavities are sequentially designated as a first resonant cavity, a second resonant cavity, a third resonant cavity, and a fourth resonant cavity. The four resonators are correspondingly disposed within the four resonant cavities. The coupling plate includes a first piece spanning the four resonant cavities and located on the same side of each resonator. The first piece has a second piece and a third piece, bent and grounded at both ends. The first piece also has a fourth piece bent towards the bottom of the resonant cavity at a position corresponding to the second or third resonant cavity. The end of the fourth piece is grounded. This filter avoids the resonant frequency of the coupling plate itself affecting the passband of the filter by cross-coupling the first piece with the second and third pieces, enabling the four resonant cavities arranged side-by-side to achieve the beneficial effect of symmetrical double zeros.
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