Layer-to-Layer Angle Interlock 3d Woven Bandstop Frequency Selective Surface

Abstract

A flexible fully textile-integrated bandstop frequency selective surface working at a central frequency of 3.75 GHz and presenting a 0.6 GHz bandwidth has been designed, manufactured and experimentally characterised. The frequency selective surface consists of a multilayered woven fabric whose top layer presents periodic cross-shaped conductive resonators, and due to its symmetries, its performance is largely independent of polarisation and angle of incidence. These properties make the prototype very interesting for shielding applications. The designed frequency selective surface is based on a layer-to-layer angle interlock 3D woven fabric. This technology provides the prototype with flexibility, portability and the possibility of manufacturing it in a large scale production by the use of existing industrial weaving machinery, in contrast to conventional frequency selective surfaces manufactured using rigid substrates. The proposed textile frequency selective surface has been simulated and experimentally validated providing good agreement between the simulations and measurements. The measured maximum attenuation has been found to be higher than 25 dB under normal incidence conditions.

Design and Implementation of a Textile-Based Embroidered Frequency Selective Surface

“…7, there is a slight frequency difference between CT FSS and CY FSS, while transmission coefficients are acceptable (under -10 dB) in both. This also accords with the researchers' earlier observations, which showed that there are differences between simulation/copper and textile FSS [10,50,51].…”

A Review of Electromagnetic Shielding Fabric, Wave-Absorbing Fabric and Wave-Transparent Fabric

“…At a specific frequency, the absorption peak was greater than 90%, and it had a good deformation effect, which can be easily worn on the body. Alonso-gonzalez et al [85] fabricated a kind of frequencyselective surface 3D woven fabric, in which conductive yarns were woven into a cruciform frequency-selective surface. Due to the symmetry of surface, wave absorption performance was largely independent of polarization and incident Angle, which can achieve large broadband wave absorption.…”

An electromagnetic shield design using frequency selective surfaces on a textile substrate

“…Researchers at the University of Sheffield developed knitted textile FSS [26]. A threedimensional u-shaped FSS unit cell is investigated in [27] whereas, layer to layer angle interlock 3D woven bandstop FSS is realized in [28].…”