Electromagnetic Analysis of a Jigsaw-Shaped FSS for Conformal Application

In this paper, a jigsaw-shaped bandpass frequency selective surface (JS-FSS) is presented for conformal application. As the structure must mechanically be flexible to allow for bending without possible cracks of the printed lines, the periodic conducting cells are chosen to have spring-like joins. Inspired by mortise and tenon joinery of the ancient Chinese wooden architecture, a novel JS-FSS has been proposed. First, the electromagnetic property of the JS-FSS is investigated for the planar case. A simple equivalent circuit model of the planar JS-FSS is demonstrated. Second, the angular stability of the proposed FSS is compared with that of the conventional square-grid FSS (SG-FSS). Finally, the simulations of cylindrically conformal JS-FSS with different curvature radii for TE and TM polarization are analysed. In addition, an S-band JS-FSS is fabricated as an example and the effect of curvature radius on the bandpass performance is also investigated experimentally.