An Innovative Mapping Technique for Sinusoidal Frequency Selective Surfaces in Shielding Applications

Abstract

This letter presents an innovative mapping technique to design and demonstrate a frequency selective surface (FSS) based bandstop filter on a sinusoidal surface. The novelty of the method lies in the uniform placement of the unit cells on different non-planar surfaces using a hybrid method comprising an analytical technique and full-wave simulation that significantly improves the shielding characteristic in a wideband spectrum (having a -10 dB stopband from 7 to 13 GHz with a fractional bandwidth of 60&#x0025

). A conventional metallic square loop is considered as the constituent unit cell topology, which is intelligibly positioned over a large surface using the proposed method. The structure is then simulated using the finite element boundary integral, as well as fabricated exploiting the threedimensional (3-D) printing technology, thereby validating the proposed concept. Such non-planar FSS geometries have potential in diverse applications, including shielding and aerospace sectors. IEEE