A multi-band tunable broadband absorber based on AFSS

A wave absorber, multi-band technology, applied in antennas, electrical components, etc., can solve the problems of difficult to work effectively and difficult to adapt to the electromagnetic environment.

Active Publication Date: 2022-03-11
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It is difficult for passive FSS absorbers to adapt to the realistic and complex electromagnetic environment in the actual application process, and it is difficult to work effectively under the detection of different band radars

Method used

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  • A multi-band tunable broadband absorber based on AFSS
  • A multi-band tunable broadband absorber based on AFSS
  • A multi-band tunable broadband absorber based on AFSS

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Embodiment

[0031] The structure of the multi-band tunable broadband absorber based on AFSS in the present invention is as figure 1 As shown, from left to right, it includes a first layer of active frequency selective surface 1 , a first layer of foam layer 2 , a second layer of active frequency selective surface 3 , a second layer of foam layer 4 and a metal back plate layer 5 .

[0032] The schematic diagram of the structure of the first layer of active frequency selective surface of the absorber in this embodiment is as follows figure 2 shown, from figure 2 It can be seen that the active frequency selective surface 1 of the first layer includes a first dielectric layer 11, and a rectangular array composed of first metal units 12 is etched on the first dielectric layer 11, and the rectangular array is an array of 18×18; the first The metal unit 12 is made up of two arrow units in opposite directions. The angle between the head positions of the arrows is 45°. The width of the straight...

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Abstract

The invention discloses a multi-band tunable broadband wave absorber based on AFSS. From left to right, it includes a first layer of active frequency selective surface, a first layer of foam layer, a second layer of active frequency selective surface, and a second layer of active frequency selective surface. Two layers of foam layer and metal backboard layer; the present invention adopts a double-layer active frequency selective surface, which can realize target frequency band multi-band broadband tunable absorbing compared with single-layer frequency selective surface. 2) The active frequency selective surface metal unit in the present invention adopts a unit composed of two arrows in opposite directions up and down, and there is a gap between the arrow parts of two adjacent units, and a diode is welded between the gaps to connect, through The analysis of the surface current of the absorber structure shows that the surface current is mainly distributed on the metal unit sheet, and the surface current is collected at the top of the arrow in the double arrow structure, and the diodes loaded in the gaps at the top of the arrow reduce the incident electromagnetic wave through ohmic loss. The energy is converted into heat energy, which increases the loss of electromagnetic waves, thereby expanding the absorption bandwidth of the absorber.

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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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01Q17/00H01Q15/00
CPCH01Q17/008H01Q15/002H01Q15/0026
Inventor 姜超曹文博黄小忠
Owner CENT SOUTH UNIV
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