Fast Semi-Analytical Design for Single-FSS-Layer Circuit-Analog Absorbers

• Published in: IEEE Open Journal of Antennas and Propagation Vol. 1; pp. 483 - 492
• Main Authors: Lv, Xiaojing, Chen, Shengjian Jammy, Galehdar, Amir, Withayachumnankul, Withawat, Fumeaux, Christophe
• Format: Journal Article
• Language: English
• Published: IEEE 2020
• Subjects: circuit-analog absorber; Dielectric losses; Equivalent circuits; evaluation criteria; Frequency selective surfaces; Frequency-selective surface; Geometry; Impedance; Integrated circuit modeling; semi-analytical methodology
• ISSN: 2637-6431; 2637-6431
• DOI: 10.1109/OJAP.2020.3021717

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 <inline-formula> <tex-math notation="LaTeX">0.0972\lambda _{L} </tex-math></inline-formula>, which is superior to existing designs with more complicated FSS patterns in the literature.