Multi-absorption-band ultra-wideband common-mode filter based on mixed resonator structure

By adopting a hybrid resonator structure and multi-absorbing band design in the common mode filter, the problems of narrow absorption bandwidth and common mode noise reflection in the prior art are solved, and the ultra-wideband common mode rejection and multi-absorbing band effects are achieved, ensuring signal integrity and electromagnetic compatibility.

CN119651097AActive Publication Date: 2025-03-18SOUTHEAST UNIV
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Patent Information

Application Number
CN202510147549.1
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-02-11
Publication Date
2025-03-18
Estimated Expiration
2045-02-11

AI Technical Summary

Technical Problem

When existing common mode filters absorb common mode noise, the absorption bandwidth is narrow, which cannot meet the wide frequency requirements of the differential signal spectrum in high-speed circuits. At the same time, common mode noise reflected back to the previous stage will increase the signal bit error rate and reduce the amplifier stability.

Method used

A multi-absorbing band ultra-wideband common mode filter based on a hybrid resonator structure is adopted. By coupling the combination of microstrip lines, main resonators, secondary resonators and resistors, hybrid resonance and multi-absorbing bands are achieved, and the common mode rejection band and absorption bandwidth are widened.

Benefits of technology

It realizes common mode noise suppression for application systems such as ultra-wideband communication, reduces the interference of common mode noise on differential signals, and avoids echo electromagnetic interference, ensuring the normal transmission of differential mode signals.

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Abstract

The invention relates to a multi-absorption-band ultra-wideband common-mode filter based on a mixed resonator structure. The multi-absorption-band ultra-wideband common-mode filter comprises a coupling microstrip line, a dielectric substrate, a main resonator, an auxiliary resonator and a resistor, the filter has an upper surface and a lower surface, and a coupling microstrip line comprises a metal conduction band located on a dielectric substrate and a metal ground layer located below the dielectric substrate; two ends of the coupling microstrip line are respectively connected with the input port and the output port; the main resonator is etched in the middle of the metal ground layer; the auxiliary resonator is etched on the outer side of the main resonator in the metal ground layer; the coupling microstrip line is mutually coupled with the main resonator and the auxiliary resonator to realize mixed resonance; the resistor crosses the gap of the auxiliary resonator at the intersection of the auxiliary resonator and the symmetric line, and the two ends of the resistor are connected with the metal ground layers inside and outside the metal conduction band; according to the invention, the ultra-wideband common-mode suppression bandwidth and a plurality of absorption bands are provided, and the absorption bands dissipate common-mode noise in the form of heat energy, so that the problem of potential common-mode electromagnetic interference in the system is reduced, and normal transmission of differential-mode signals is not damaged at the same time.
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