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Circuit Models for Printed Multiresonant FSSs

Frequency selective surfaces, the unit cell of which shows a multiresonant behavior, are analyzed in this work by means of an equivalent circuit approach. The derivation of the topology and the computation of thevalues of the elements in the equivalent circuits is achieved through the extension of a previous formulation developed by the authors for multiresonant discontinuities in hollow-pipe waveguides. This formulation results in the obtaining of canonical circuits formed by a series connectionof resonant LC tanks. The results provided by the circuit models for the scattering behavior of a frequency selective surface printed on a dielectric substrate are compared with those computed using a commercial electromagnetic simulator.