Wideband low-RCS circularly polarized antenna with metasurface combining wave diffusion and polarization conversion

Qi Zheng, Chenjiang Guo, Jun Ding, Peng Fei, Peyman PourMohammadi and Guy A. E. Vandenbosch

Journal of Electromagnetic Waves and Applications, 2023, vol. 37, issue 2, 207-218

Abstract: A novel and simple low-profile high-gain wideband circularly polarized (CP) slot antenna with low radar cross section (RCS) is presented. The proposed antenna is composed of a traditional linearly polarized (LP) slot antenna and an integrated metasurface-based superstrate. The superstrate consists of a center array with metasurface (MS) unit cells and four surrounding arrays with 4×4 MS unit cells. On the one hand, a wideband and high-gain CP radiation in the frequency band of 5.27-6.18 GHz (a relative bandwidth of 15.9%) is achieved by the polarization conversion property of the MS and four surrounding arrays. On the other hand, a broadband RCS reduction in the frequency band of 4.5-20 GHz (a relative bandwidth of 126.5%) is obtained by the combination of two electromagnetic wave diffusion principles. Inspired by C-band, X-band and Ku-band radar applications, a low-cost stealthy prototype with broadband low RCS and CP radiation is realized.

Date: 2023
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DOI: 10.1080/09205071.2022.2119435

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