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This paper presents a very simple analytical model for the design ofFrequency Selective Surfaces based on Complementary Split Ring Resonators(CSRR) within the microwave range. Simple expressions are provided for the mostimportant geometrical parameters of the model, yielding an accurate descriptionof the CSRR resonance frequency and avoiding full-wave numerical simulations.Besides, a qualitative description of the band-pass filter behavior of thesestructures is described, considering its high quality factor Q.

Waveguide Model for Thick Complementary Split Ring Resonators