A three-frequency band high-absorption electromagnetic structure based on a band-pass frequency selective surface

By designing a three-layer composite structure and utilizing bent metal wires and lumped resistance to regulate the equivalent inductance and capacitance, a low-profile, high-absorption, and polarization-stable electromagnetic structure was achieved. This solves the problems of high structural profile, complex processing, and unstable oblique incidence performance in existing technologies, and is suitable for electromagnetic stealth, radar cross-section reduction, and electromagnetic interference suppression.

CN122393623APending Publication Date: 2026-07-14ZHEJIANG UNIV CITY COLLEGE
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
ZHEJIANG UNIV CITY COLLEGE
Filing Date
2026-05-14
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Existing multi-band absorption structures have high profiles and complex manufacturing processes, making it difficult to achieve coordinated operation of the three bands. Furthermore, their performance is unstable under oblique incidence conditions, making them unsuitable for complex application scenarios.

Method used

It adopts a three-layer composite structure, including an upper loss layer, a middle air gap layer and a lower bandpass frequency selective surface. Independent resonant branches are formed by bending metal wire structure. Combined with lumped resistance and square ring gap adjustment of equivalent inductance and capacitance, high absorption and impedance matching in three frequency bands are achieved.

Benefits of technology

It achieves high absorption peak values ​​in three target frequency bands, with an absorption rate stable above 0.9. It adapts to stable dual-polarization response within the incident angle range of 0° to 30°, has a simple and easy-to-manufacture structure, and is suitable for complex electromagnetic environments.

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Abstract

The application discloses a three-frequency-band high-absorption electromagnetic structure based on a band-pass frequency selective surface and belongs to the technical field of electromagnetic wave absorption. The structure comprises, from top to bottom, an upper loss layer, an intermediate air separation layer and a lower band-pass frequency selective surface. The upper loss layer is provided with curved metal wires and lumped resistors to form three independent resonance branches; the lower band-pass frequency selective surface is composed of two dielectric substrates and three metal layers, and a square ring gap is formed in the middle metal layer as a frequency selective reflection boundary. The application realizes high-absorption performance with an absorption peak higher than 0.9 in three target frequency bands through the synergistic effect of multi-resonance effect, impedance matching effect and frequency selection boundary effect, has the advantages of low profile, dual-polarization stability, stable incident angle performance, flexible parameter control and the like, and can be widely applied to the fields of electromagnetic stealth, radar cross section reduction and electromagnetic interference suppression.
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