Design and Characterization of Periodically Conductive Woven Fabric

Xue

et al. 2022

Self Cite

Based on the research basis of single-layer cross-shaped frequency selective fabrics, the electromagnetic transmission characteristics of double-layer and three-layer cross-shaped frequency selective fabrics were explored in this paper. The frequency selective fabrics with different multilayer structures and specific-sized conductive units were designed, and then prepared by the computer engraving method and tested using the free-space method. The results show that the single-layer sample is less affected by the polarization mode of the electromagnetic wave, while the effect of the incidence angle is slightly larger. For the frequency selective fabric samples with the same frequency selective surface layers, the frequency selective characteristics of the double-layer samples are more ideal than those of the single-layer samples, while the electromagnetic loss of the three-layer samples is large and the narrow-band transmission characteristic is weakened. For the frequency selective fabric samples with the complementary frequency selective surface layers, the double-layer sample mainly shows band-pass characteristics and the narrow-band transmission characteristics are better than the single-layer sample. The three-layer sample of ‘patch + aperture + patch’ presents band-pass characteristics, and the ‘aperture + patch + aperture’ sample generates resonance at multiple frequency points, but the resonance peaks are all less than –10.00 dB, meaning that the sample presents full shielding characteristics in the test frequency band. The equivalent circuit model was built to explore the electromagnetic transmission mechanism, revealing the fabric type and structure, and the conductive unit type and size will affect the equivalent impedance of the frequency selective fabrics, thus further influencing the electromagnetic transmission characteristics.

mentioning

confidence: 99%

Design, preparation and electromagnetic characteristics analysis of single, double and three-layer cross-shaped frequency selective fabrics

Xue

et al. 2022

Self Cite

“…25,26 Also, the effectiveness of the design approach, simulation technique, and preparation process were analyzed in detail. [27][28][29] However, the existing work has mainly focused on single-layer FSFs and the electromagnetic transmission characteristics are relatively limited. Based on single-layer FSFs, cross-shaped double-layer and three-layer FSFs were proposed and explored tentatively.…”

mentioning

confidence: 99%

Analysis of electromagnetic transmission characteristics of square loop frequency selective fabrics with different layers

et al. 2022

Self Cite

Nine square loop frequency selective fabrics (FSFs) with different layers were designed, prepared, and tested in this paper. Then the electromagnetic transmission characteristics were analyzed in detail. The test results reveal that the transmission characteristics of single-layer FSFs are basically identical in two electromagnetic wave polarization modes and keep good frequency selective characteristics as the incidence angle increases. For FSFs with the same frequency selective surface (FSS) layers, the increase of FSS layer number may exert influence on the electromagnetic transmission characteristics, but the influence mode and extent are inconsistent for two kinds of FSFs. For FSFs with complementary FSS layers, the transmission coefficient curves of the double-layer sample are the combination of two single-layer FSFs, with three resonance phenomena at 7.63, 10.75, and 12.38 GHz. However, three-layer FSFs with complementary FSS layers show poor frequency selective characteristics, mainly presenting full shielding characteristics. An equivalent circuit model of multi-layer FSF is built to explore the electromagnetic transmission mechanism; many factors, such as the fabric type, structure, conductive unit type, and size, would nonlinearly affect the electromagnetic transmission characteristics. The work can provide reference value for the study of diverse multi-layer FSFs and variant electromagnetic characteristics.

“…In fact, conductive yarns and non-conductive yarns can be interwoven periodically to form grid-type FSFs using weaving or knitting technology. 11,12 Such products have excellent softness, air permeability and flexibility, but the types of conductive units are limited and the size of the grid-type unit is extremely difficult to control. Therefore, the practical application is restricted.…”

mentioning

confidence: 99%

Preparation of ring-shaped frequency selective fabrics and analysis of electromagnetic transmission characteristics

Xue

et al. 2022

Self Cite

In order to explore the feasibility of preparing frequency selective fabrics by computer embroidery technology, two complementary ring-shaped structures were selected for design in this paper. Several samples with different size parameters were prepared by the computer embroidery process, and the electromagnetic transmission characteristics were systematically tested using the free-space method. The effects of unit type, electromagnetic wave polarization mode, incident angle, unit size parameters and processing methods on different samples were analyzed in depth. The results show the aperture-type and patch-type samples have obvious band-pass and band-stop characteristics in the test frequency range, respectively, but there are some differences in the resonance frequency and peak of the complementary structure samples of the same size. Different parameters have dissimilar influences on the electromagnetic transmission characteristics. With the increase in incident angle, the frequency selective characteristics of two complementary structures are gradually weakened, and the aperture structure has higher angular stability. Under the conditions of different electromagnetic wave polarization modes and incident angles, the computer embroidery samples have good frequency selective characteristics, which demonstrates the effectiveness of computer embroidery processing technology. However, compared with the ideal computer-based carving sample, there is a certain gap in the resonance peak, and the electromagnetic loss is large. The processing accuracy of the computer embroidery technology needs to be explored further.