In this article, analytical, empirical, and numerical techniques are integrated for analyzing and synthesizing circuit analog (CA) absorbers based on a single-layer frequency-selective surface (FSS). The proposed design approach dramatically reduces the number of full-wave simulations required for global optimization, so that the potential of fundamental FSS geometries can be exhaustively exploited. With the semi-analytical algorithm, the near optimal bandwidth-thickness can be quickly and reliably calculated for a given single-FSS-layer topology. To demonstrate the robustness of our semi-analytical approach, a square-patch and square-ring FSS absorbers at 10 dB level of absorption are revisited and optimized. The designs are constrained by available materials and standard tolerances for experimental validation. A manufactured prototype achieves a relative bandwidth of 144.15% and a normalized thickness of $0.0972\lambda _{L}$ , which is superior to existing designs with more complicated FSS patterns in the literature.

中文翻译：

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单层FSS电路模拟吸收器的快速半分析设计

本文集成了分析，经验和数值技术，用于分析和合成基于单层频率选择表面（FSS）的电路模拟（CA）吸收器。所提出的设计方法极大地减少了全局优化所需的全波仿真的次数，因此可以穷尽地开发基本FSS几何形状的潜力。使用半解析算法，对于给定的单FSS层拓扑，可以快速可靠地计算出接近最佳的带宽厚度。为了证明我们的半分析方法的鲁棒性，我们重新研究并优化了吸收率为10 dB的方片和方环FSS吸收器。设计受到可用材料和标准公差的限制，以进行实验验证。 $ 0.0972 \ lambda _ {L} $ ，这优于文献中具有更复杂的FSS模式的现有设计。