Parametric Analysis of Different Configurations of Loop Elements in Frequency-Selective Surfaces

In this study, we present the analysis and modeling of detailed investigation and study of different configurations of loop elements in FSS, with resonant unit cells. The elements studied are 1) Square loop, 2) Double Square loop and 3) Gridded Square loop. The simulations of microstructure are performed with full wave simulation tool CST Microwave Studio on single-substrate for different physical parameters, oblique incidence and effect of TE / TM polarization as well. The transmission and reflection properties of FSSs are evaluated through a simple and accurate circuit approach which is also useful for acquiring physical insights into the working principles of FSS. Then the results obtained from the circuit model and CST simulations are compared against each other. All the equivalent circuits are designed and simulated using ADS SPICE generator. The circuit models are within 1.5% of average deviation against reference data.