A Super Diffuse Broadband RCS Reduction Surface Design Based on Rotated Phase Coding Polarization Conversion Metasurfaces

• Published in: IEEE transactions on antennas and propagation 2023-09, Vol.71 (9), p.1-1
• Main Authors: Deng, Gu-Ying, Zhang, Yun-Hua, Gao, Huo-Tao, Shu, Yuan-Liang, He, Si-Yuan, Zhu, Guo-Qiang
• Format: Article
• Language: English
• Subjects: Bandwidths; bistatic RCS reduction; Broadband; Broadband antennas; Broadband communication; Coding; coding phase; Conversion; Design techniques; Electric fields; Encoding; Metasurfaces; Pancharatnam-Berry phase; Phase change materials; Phases; Polarization; Radar cross sections; Reduction; Scattering; spatial phase; super diffuse; Surface treatment; δ<sub xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"> E
• ISSN: 0018-926X; 1558-2221
• DOI: 10.1109/TAP.2023.3298136

A super diffuse broadband radar cross section (RCS) reduction surface design method based on rotated phase coding polarization conversion metasurfaces (PCMs) is proposed. Multiple PCMs with coding phases are employed for wideband RCS reduction, and the spatial locations of the PCMs are utilized for bistatic RCS reduction since it arouses spatial phase. Further, it is derived that the Pancharatnam-Berry (P-B) phase provides extra design freedom for bistatic RCS reduction. These three types of phases are combined for optimal wideband bistatic RCS reduction. To facilitate bistatic RCS reduction design. the variance of the scattered field (δ E ) is derived as an indicator for the evenness of the whole space electric field distribution, and an optimal design method is developed thereafter. For comparison, two RCS reduction surfaces, termed as MS1 and MS2 respectively, composed of phase coding PCMs are designed, fabricated, and measured to demonstrate the effectiveness of the proposed method. The MS1 is designed by only using spatial phase, and multiple coding phases, while MS2 is designed by further exploiting the P-B phase. The MS2 achieves 10-dB monostatic RCS reduction ranging from 8.8 to 25.4 GHz (97.1% relative bandwidth, which is 2.2% better than that of the MS1). More importantly, the MS2 realizes super diffuse characteristic under different incidences. It achieves 10-dB bistatic RCS reduction ranging from 9 to 25 GHz (94.2% relative bandwidth), and the maximum bistatic RCS reduction can reach upto 20 dB. The proposed broadband super diffuse RCS reduction design method is particularly desirable for both monostatic and bistatic RCS reduction of various complex coupling structures.