Realization of planar frequency selective fabrics and analysis of transmission characteristics

Abstract

Based on traditional frequency selective surfaces (FSSs), the research ideas of novel frequency selective fabrics (FSFs) are proposed. In this paper, the specific square-loop patch FSF was chosen as an example to illustrate the design procedures, including ANSYS (HFSS) simulation and numerical calculation methods, and then a computer-based experiment was conducted to develop prototypes. Although the simulation, calculation, and experiment results have minor differences, especially the resonance frequency, they show good consistency overall, which demonstrates that traditional design methods could also apply to 2D FSFs. The experiment transmission curve shows obvious band-stop response, peaking at -37.12 dB at the resonance frequency 11.65 GHz, and the narrow bandwidth of -10 dB is predicted from 10.85 GHz to 12.55 GHz. To further verify the validity of design procedures, two complementary cross-shaped FSFs were fabricated through a computer embroidery process, and the experimental transmission curves are complementary as expected, peaking at -26.05 dB and 0 dB at the same resonance frequency 9.65 GHz, and the narrow bandwidths of -10 dB and -0.5 dB are 1.07 GHz and 0.41 GHz, respectively. Although many problems need to be solved in further research, this convenient fabrication method and theoretical basis could make relevant work feasible in later study.

Research Progress on Electromagnetic Textile Materials

“…The finishing process are suitable for fibers, yarns and fabrics [10]. For the fiber or the yarn that has been formed and does not have electromagnetic function, the surface of it may be coated with a metal coating or magnetic powder by electroless plating, electroplating, magnetron sputtering or other ways.…”

Electromagnetic interference shielding characteristics of a core layer-coated fabric with excellent hand-feel characteristics

“…ESFs are widely studied by researchers owing to their special properties such as a controllable structure, flexible weaving, and washing resistance. 6 Meanwhile, the effectiveness of ESFs as shielding materials is related to various parameters of fabrics, such as their thickness, tightness, and density, and their effects have correlations. 7 Surface-coated fabrics are widely applied in the preparation of ESFs.…”

Design and Characterization of Periodically Conductive Woven Fabric

“…Traditional electromagnetic (EM) shielding fabrics were fabricated through conductive polymer coating or conductive yarn-weaving process, which certainly degraded the wearing properties [9][10][11]. The novel fabrics with good shielding effectiveness (SE) as well as wearability were studied based on the concept of traditional FSSs, and the methods such as silk screen printing, computer embroidery technology, and cloth hot stamping process were used to obtain the periodic conductive pattern on the surface of fabrics [12,13]. The uninvolved textileforming technology, such as weaving, knitting, and basketry processes, could also be used to fabricate the products, in which the periodic conductive patterns are embedded in the fabrics, which is different from the form of metallized finishing, in which fabrics act as substrates.…”