With the rapid development of detection technology and artificial intelligence, the widespread use of multispectral detectors has increased challenges to stealth capabilities. In this paper, an optically transparent ITO/dielectric/ITO sandwich structure with high microwave absorption and a spatially tunable infrared radiation is designed. The absorption in the 8.1-9.8 GHz band more than 90% in the microwave band is realized. By changing the ITO ratio on the surface of the absorbing layer, a customizable infrared emissivity can be realized. The tunable IR emissivity ranges from 0.2 to 0.7 with good thermal insulation. The structure has good wideband radar absorption, spatially adjustable infrared emissivity and optical transparency characteristics, and has broad application prospects in the field of multispectrum stealth.
An optically transparent metamaterial structure with broadband microwave absorptivity is proposed. A specifically designed optically transparent metasurfaces was designed to control the microwave absorption though properly modifying the impedance and resonance peaks of the meta-atom. Within a wide incident angle of ±60o, the proposed structure displays high absorptivity greater than 90% in the region of 33.7-44.7GHz for TE polarization. For TM polarization, the absorptivity in the region of 11.8-37.2GHz is greater than 90%. The perfect consistency between experimental results and simulation results demonstrates that the proposal has practical application of multispectral stealth technology.
In this paper, an active frequency selective surface (AFSS) with tunable frequency passbands is proposed. The AFSS structure is composed of three metallic layers that separated by two thin dielectric substrates. The tunable passband characteristics can be achieved by embedding PIN diodes on the top and bottom metallic layer. By switching the on-off state of PIN diodes on the top and bottom layer, the resonant frequency will change, thus realizing the passband tunability. Meanwhile, the AFSS structure has good angular stability in the large oblique incidence.
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