The novel frequency selective fabric and application research

Abstract

There have been various efforts on frequency selective surface in recent years, and of course, some research progress has been made, especially in numerical calculation and simulation field. However, it seems that less work is done on the processing and forming methods. Soft fabrics are periodic and have advantages over the rigid materials in lightweight, softness, low bending rigidity, which make it possible and meaningful to study their filtering property as the medium in electromagnetic field. In this paper, a kind of electromagnetic functional textile based on frequency selective surface was proposed specifically for 10 GHz, dominant frequency of X-band radar. The full-wave simulation software, HFSS v14, was used for theoretical simulation and optimization, and two complementary cross-shaped unit cells with optimum size were obtained. Then, the frequency selective fabrics were manufactured through silk-screen-printing technology and measured using transmission method. It showed that the measured and simulated results had good consistency, and the fabricated frequency selective fabrics had ideal band-stop or band-pass performance. Finally, according to the analysis of S 21 curve and transmission line equivalent circuit modal, the filtering mechanism was explained and the great potential in practical application of frequency selective fabrics was further illustrated.

Electromagnetic Function Textiles

“…The textiles are light, soft, and flexible in processing. Relying on the media of textile materials, textile processing technology will qualify the textile products to attain the filtering characteristics and light, soft, and other characteristics, which can be applied in more fields [13]. Flexible periodic array structure prepared by textile processing technology is called frequency selective fabric (FSF).…”

Quadruple filtering mechanism through an effective sketch of reconfigurable frequency selective surface

“…The main factors to be compared include the number of substrate and metallic layers, integration of reconfiguration technology, modes of operation, and single or multi-band performance. For this purpose, Table 1 summarises the characteristics of the examined FSS designs [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. As reported in this table, literature [18,19,21] provide multi-band operation via multiple substrates and metallic layers.…”

“…As the name implies, in single-band category, only one frequency range is passed or rejected. Such a performance is usually obtained via single-layer structures where the conductive elements are printed on one substrate layer [12][13][14][15][16]. Although successful performances have been achieved via such single-band structures, but the need for wider bandwidths or various pass or stop bands calls the need for more effective remedies.…”

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.…”