Research on planar frequency selective fabrics with Jerusalem-shaped units

Abstract

Planar frequency selective fabrics (FSFs) with Jerusalem-shaped units were proposed in this paper. In accordance with the previous work, the design process was specifically for 10 GHz. Through simulation and optimization procedures, the ideal structure parameters were obtained, and the proposed FSFs with optimized parameters showed good stability to differential and integral algorithms, transmission modes and incidence angles of electromagnetic (EM) waves. To further explore the internal EM transmission mechanism of FSFs, the surface currents at 4, 10 and 14 GHz were analyzed comparatively. Based on the simulated results, 10 samples with the polyester fabric substrate were fabricated through the computer-based carving method and the transmission characteristics were tested using the Shielding Room Method. The fabricated FSFs indeed showed good frequency response characteristics, as expected, and the comparison of measured and simulated results verified the validity of the design procedures. The influence rules of structure parameters (p, a, b, c) were further studied in detail by changing their values properly, and the simplified equivalent circuit model was proposed to explore the corresponding physical mechanism, which could provide physical insight into the performance of the FSFs.

Transmission characteristics of cylindrical frequency selective fabrics with Jerusalem-shaped units

“…Considering the perfect symmetry of Jerusalem-shaped units and existing experimental results, 13 in this paper the models of two complementary CFSFs with Jerusalem-shaped units were proposed and built, as shown in Figure 1(a) and (c). Figure 1(b) and (d) respectively give a schematic and sectional view of the planar unit cell, in which the key parameters are marked.…”

“…Fabric-based FSSs or frequency selective fabrics (FSFs) have attracted extensive research interest and the related works include model building, theoretical calculation and sample preparation methods like coating printing, silk-screen printing and computer embroidery. [10][11][12][13][14][15][16][17] Despite several shortcomings, research on FSFs has made remarkable progress, like the exposition of the systematic research idea. However, the existing studies were mainly focused on the planar FSFs, with no emphasis on the influences of bending effects.…”

Narrow-band frequency selective fabrics: simulation and experiment results

“…[7][8][9][10][11][12] Textile forming technology, such as weaving, knitting and braiding, could be used to prepare the products in which the periodic conductive patterns are embedded. 7 Also, methods such as silk-screen printing, computer embroidery technology and the cloth hot stamping process have been used to obtain the periodic conductive pattern on the surface of fabrics, [8][9][10][11][12] serving as the flexible substrates. Actually, two-dimensional (2D) weaving technology is often used to prepare the periodically conductive grid structure and the transmission characteristics are mostly high-pass filtering properties, lacking the ideal band-pass and band-stop characteristics.…”

“…Actually, two-dimensional (2D) weaving technology is often used to prepare the periodically conductive grid structure and the transmission characteristics are mostly high-pass filtering properties, lacking the ideal band-pass and band-stop characteristics. [7][8][9][10][11] Although more complicated fabric forming processes could be used in the preparation of FSFs, the preparation accuracy as well as efficiency is difficult to satisfy. The finishing technology shows flexible and operable fabrication advantages, which seems to be more suitable for laboratory research.…”

“…The finishing technology shows flexible and operable fabrication advantages, which seems to be more suitable for laboratory research. 12 The influences of various parameters on the frequency response characteristics have been systematically studied in our previous work, [7][8][9] and the expected transmission performance could be obtained by adjusting the dimension parameters specific to design requirements. In practical applications, such as communication, stealth, radar detection, etc., the bandwidth level is also an extremely important indicator, as it determines the frequency range at which electromagnetic (EM) waves could pass through or be shielded, and then affects the transmitted or reflected information and energy.…”