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