Multi-band tunable broadband wave absorber based on AFSS

A wave absorber, multi-band technology, applied in electrical components, antennas, etc., can solve the problems of difficult to work effectively and difficult to adapt to the electromagnetic environment.
CN112821085AActive Publication Date: 2021-05-18CENT SOUTH UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
CENT SOUTH UNIV
Publication Date
2021-05-18

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Abstract

The invention discloses a multi-band tunable broadband wave absorber based on AFSS, which comprises a first active frequency selective surface layer, a first foam layer, a second active frequency selective surface layer, a second foam layer and a metal backboard layer from left to right, the dual-layer active frequency selective surface is adopted, and compared with a single-layer frequency selective surface, multi-frequency-band broadband tunable wave absorption of a target frequency band can be achieved; 2) an active frequency selective surface metal unit adopts a unit consisting of an upper arrow and a lower arrow which are opposite in direction, a gap is formed between the arrow parts of two adjacent units, a diode is welded between the gaps for connection, and the result can be obtained by analyzing the surface current of the wave absorber structure. The surface current is mainly distributed on the metal unit sheet and is collected to the arrow top end of the double-arrow structure, and the diode loaded in the gap of the arrow top end converts the energy of incident electromagnetic waves into heat energy through ohmic loss, so that the loss of the electromagnetic waves is improved, and the absorption bandwidth of the wave absorber is expanded.
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Description

technical field

[0001] The invention belongs to the technical field of electromagnetic stealth, and in particular relates to an AFSS-based multi-band tunable broadband absorber. Background technique

[0002] Due to the development of various anti-stealth technologies and the successive advent of precision-guided weapons, as well as the more complex battlefield electromagnetic environment, electromagnetic stealth technology has become a key research to meet this challenge. Frequency Selective Surface (FSS) has selective permeability to electromagnetic waves. The United States conducted research on FSS theory in the 1960s, and now this technology is applied to stealth fighters in service with the US military. Active Frequency Selective Surface (AFSS) refers to adding diodes or varactor diodes to FSS, changing the resonance effect of FSS by adjusting the bias voltage or current, and improving the mobility and anti-interference of FSS. It is difficult for passive FSS absorbers ...

Claims

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