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A three layered low profile dodecagon shaped band stop frequency selective surface (FSS) is presented in this paper for X band rejection applications. The three layers are placed in a manner which is complement to each other. The low profile three layered FSS with unit cell dimensions on the order of 0.2λ0 × 0.2λ0 (at lower center frequency of 8.2 GHz) with overall thickness of three layers including air gap of 5.2 mm is presented. For experimental verification, a three layered FSS has been fabricated and measured. Simulation results show that the designed three layered FSS can provide a stopband from 8GHz to 12.5 GHz with two transmission zeros of 8.2 GHz and 10.5 GHz with a fractional bandwidth of 45%. The complete design and equivalent circuit model (ECM) of the three layered FSS are presented in this paper.

DESIGN OF DODECAGON UNIT CELL SHAPE BASED THREE LAYERED FREQUENCY SELECTIVE SURFACES FOR X BAND REFLECTION