Ultrawideband Low-RCS Array Antenna Based on Double-Layer Polarization Conversion Metasurface

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Abstract
In this letter, a novel integration method of array antenna and polarization conversion metasurface (PCM) is proposed for wideband RCS reduction. This method allows the design of low-RCS metasurface and conventional array antenna independently, and then directly combines them in a shared aperture. In this way, a compact metasruface array antenna is obtained and low-RCS property is ensured first. Subsequently, current analysis methodology is utilized to optimize the radiation performance and a limited-removing strategy is proposed. This strategy not only improves the radiation performance but also keeps the low-RCS property. As proof of principle, a 2×2 array antenna is presented based on a double-layer PCM. Numerical results suggest that enhanced radiation performance and ultra-wideband RCS reduction covering both in and out-of band are achieved simultaneously, verifying the effectiveness of proposed method. This method ensures low-RCS performance first and then modifies radiation performance, which essentially converts complex and time-consuming scattering optimization to mature radiation modification. Thus it makes the design of wideband low-RCS array antenna easier and faster.
Funding Information
  • National Natural Science Foundation of China (62371466, 62171460)
  • Natural Science Basic Research Program of Shaanxi Province, China (2024JC-ZDXM-39, 20220104, 2020022)
  • Foundation by National Key Laboratory of Science and Technology on Space Microwave (HTKJ2022KL504004)

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