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W-band Characterization of Grounded Frequency Selective Surface Arrays Composed of Non- equal slot length sub-arrays, accepted for publication This publication appears in: International Journal of Microwave and Science and Technology Authors: S. Islam, J. Stiens, G. Poesen, R. Vounckx and E. Walter Volume: 2009 Pages: 1-7 Publication Date: Dec. 2009
Abstract: In this work we present the design and construction of Frequency Selective Surface arrays composed of two sub-arrays of different slot lengths. We investigated their response variations with the variation of slot length differences of the elementary sub-arrays. Such non-homogeneous arrays cannot be simulated with Computer Aided Design (CAD) programs because the boundary conditions are not fulfilled by the simulator. In infinite array simulation, the periodic boundary conditions are prescribed on the walls of the unit cell, whereas in the case of sub-arrays of unequal slot length such boundary conditions are not applicable. The CAD simulation of such combined array gives incorrect values of amplitude and phase responses. In this work we investigate the characteristics of such complex arrays by using heuristic experimental approach. The results of the experimental approach demonstrate that the resultant reflection amplitude and phase of such complex array depend on the difference of slot lengths of the two sub-arrays.
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