Design of Double-Square-Loop Frequency-Selective Surfaces Using Differential Evolution Strategy Coupled with Equivalent-Circuit Model

The design of frequency-selective surfaces (FSSs) with double-square-loop patch elements using the differential evolution strategy coupled with an equivalent circuit model (ECM) is proposed in this paper. A very efficient optimization algorithm, the differential evolution strategy is employed to tune the FSS unit-cell dimensions. In the fast computational method, the equivalent-circuit model is also employed to analyze the electromagnetic scattering from the FSS screen. The simulated results are in good agreement with the measured results. © 2004 Wiley Periodicals, Inc. Microwave Opt Technol Lett 44: 159–162, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20575