Dual-band absorbing frequency selective surface system and design method, aircraft

Abstract

The invention belongs to the field of microwave technology and aircraft stealth technology, and discloses a dual-band microwave-absorbing frequency-selective surface system and a design method thereof, and an aircraft. The dual-band microwave-absorbing frequency-selective surface system is provided with: a dielectric support plate; Periodically arranged square rings of resistive film on the upper surface of the plate and a circular groove frequency selective surface arranged on the lower surface of the dielectric support plate; the frequency selective surface of the circular groove includes the dielectric plate and the metal plate with no thickness on the upper surface of the dielectric plate layer, the ring grooves arranged periodically are opened on the metal layer. The present invention can realize k-band wave transmission / dual-band wave absorption; the pattern of the array element is compact, and the stability is good under oblique incidence conditions; the structure of the present invention is simple, compared with the multi-layer structure; only the resistance film of the upper layer and the dielectric support of the middle layer The frequency selective surface of the board and the lower layer is relatively lighter and the profile is lower; the transition zone between the wave-transmitting and absorbing frequency bands is small, and the wave-absorbing effect is good.

Description

technical field [0001] The invention belongs to the field of microwave technology and aircraft stealth technology, and in particular relates to a dual-band microwave-absorbing frequency selection surface system, a design method, and an aircraft. Background technique [0002] At present, the commonly used existing technology in the industry is as follows: for aircraft targets, when encountering enemy radar detection, the threat mainly comes from the direction of the nose cone, and the radar antenna system of the aircraft is one of the main scattering sources in this direction, so the reduction of radar The RCS of the antenna system is crucial to the stealth of the aircraft. At present, the measure to realize the frequency domain stealth of the radar antenna system is mainly to load the frequency selection surface on the radar radome, and to achieve the purpose of stealth by reflecting the incoming wave of the radar in the main threat direction to other directions, which can e...

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Problems solved by technology

[0003] To sum up, the problems existing in the existing technology are: the existing wave-absorbing frequency selection surface has poor wave-transmitting effect, and the transition bandwidth of wave-absorbing / transmitting

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