A multilayer Jerusalem Cross Frequency Selective Surface

In this paper a previously proposed configuration of a Jerusalem cross frequency selective surface (JC-FSS) is optimized for operation in the 2.4 GHz ISM band. The new feature introduced in this paper is the addition of superstrate layer on top of the FSS. In practice the added layer accounts for the substrate of an antenna mounted above the FSS. In this second layer is where the TE and TM propagating waves would impinge into the structure. The simulation results show a frequency stability of up to 70deg for both TE and TM polarized waves at 2.45 GHz. In addition the band gap for the proposed JC-FSS covers the full ISM band (2.38-2.5 GHz, 4.5%). The fabricated structure shows adequate 180deg phase shift in comparison with a metal sheet, resonating at 2.47 GHz with a band gap of 2.5%.