Zamel Hany M, Eldesouki Eman M, Attiya Ahmed M
Microwave Engineering Department, Electronics Research Institute (ERI) Cairo, Cairo, Egypt.
School of Sciences and Engineering, American University in Cairo (AUC), Cairo, Egypt.
Sci Rep. 2025 Jan 3;15(1):619. doi: 10.1038/s41598-024-82993-5.
This paper presents a novel design approach for an anomalous reflector metasurface for communication systems operating at 8 GHz band. The main contribution of this work is the development of a general analytical method that accurately calculates the electromagnetic response of realistic metasurfaces with periodic impedance profiles. The modulated surface impedance is achieved by incorporating appropriately sized conductive patches on a grounded dielectric substrate. The proposed design utilizes a genetic algorithm (GA) optimization technique to optimize the surface impedance that achieving efficient reflection of incident waves towards a specific angle of 45˚. The optimization process targets a specific impedance profile derived from the analytical model, leading to the desired anomalous reflection behavior. Then by using periodic boundary conditions, dimensions of an elliptical unit cells can be obtained. To evaluate the anomalous reflection performance, the bistatic radar cross section (BRCS) are simulated at different frequencies. A reflector metasurface sheet is fabricated and measured for verification. The proposed approach provides a foundation for implementing intelligent metasurfaces in various communication applications.
本文提出了一种用于工作在8GHz频段通信系统的异常反射器超表面的新颖设计方法。这项工作的主要贡献是开发了一种通用分析方法，该方法能准确计算具有周期性阻抗分布的实际超表面的电磁响应。通过在接地介电基板上并入尺寸合适的导电贴片来实现调制表面阻抗。所提出的设计利用遗传算法（GA）优化技术来优化表面阻抗，以实现向45˚特定角度的入射波的高效反射。优化过程以从分析模型得出的特定阻抗分布为目标，从而产生所需的异常反射行为。然后通过使用周期性边界条件，可以获得椭圆形单元胞的尺寸。为了评估异常反射性能，在不同频率下模拟了双站雷达散射截面（BRCS）。制作并测量了一个反射器超表面片进行验证。所提出的方法为在各种通信应用中实现智能超表面提供了基础。
