A multi-mode absorptive frequency selective surface with tunable wave absorption capability

By designing independently controllable metal unit structures and varactor diodes on the frequency-selective surface, dynamic control and multi-mode switching of the absorption frequency are achieved, solving the problems of fixed absorption frequency and limited bandwidth in traditional surface absorbing technology. This method is suitable for intelligent radar and RCS reduction technology.

CN116826386BActive Publication Date: 2026-06-26AIR FORCE UNIV PLA
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
AIR FORCE UNIV PLA
Filing Date
2023-07-19
Publication Date
2026-06-26

AI Technical Summary

Technical Problem

Traditional absorbent frequency-selective surfaces cannot change their absorption frequency after processing, limiting their absorption bandwidth, and there is insufficient research on multi-mode tunable structures.

Method used

A multi-mode absorption frequency selective surface is designed by setting a metal unit structure, a varactor diode and a metal feed line layer on a metal pattern layer and a dielectric substrate to form an independently controllable two-part structure. The varactor diode is embedded to realize the dynamic control of the resonant frequency of the absorption band.

Benefits of technology

It achieves dynamic control of the absorption frequency, has two adjustable absorption modes (single and dual), and combines polarization insensitivity and angle stability, making it suitable for intelligent radar systems, cognitive radio networks, and RCS reduction technology.

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Abstract

The application discloses a multi-mode absorbing frequency selective surface with adjustable wave absorbing capacity, which comprises a metal pattern layer, a first dielectric substrate, a metal back plate, a second dielectric substrate and a metal feed line layer arranged in sequence from top to bottom, wherein the metal pattern layer comprises a plurality of metal unit structures arranged in an array, each metal unit structure comprises a polygonal metal sheet located at the center of the unit, metal bands extending from the periphery of the polygonal metal sheet, and metal arms extending from the four corners of the unit, the metal arms comprise two independent metal structures, the polygonal metal sheet and the metal bands are connected to each other through a first varactor diode, the two independent metal structures are connected to each other through a second varactor diode, and the metal arms in adjacent metal unit structures jointly form a new rotating cross structure. The independent feed line network is built through the metal through hole, so that the structure is divided into two independently regulated parts, and the whole has single and double adjustable wave absorbing modes.
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