A new miniaturized and ultra-thin non-resonant element-class of convoluted frequency selective surface (FSS) structure with reduced overall thickness is presented and empirically verified. The proposed FSS structure, which could be capable of providing a first order narrow band pass response for X band applications, is made up of three metallic layers separated from one another by two dielectric substrates. The outer layers are made up of convoluted inductive grids， and the inner layer is a non-resonant structure composed of convoluted square slot array. A first-order band pass response FSS with a centre frequency of 10.5 GHz and fast roll-off characteristics is presented. The overall element thickness of the proposed FSS is λ/56, which is smaller than previously proposed miniaturized structures. The comparison between all patch layers with the proposed structure which is not an all patch layers is explicated in detail with its convoluting effects. The validity of this design procedure is verified with an equivalent circuit model, and a sample is fabricated and measurement done using a WR 90 waveguide setting for experimental verification.
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