The frequency response characteristics of planar frequency selective fabrics (FSFs) with cross-shaped units

Textile Research Journal

Xiao

Shi

et al. 2016

Self Cite

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.

Section: Fabrication and Test Of Square-loop Patch Fsfmentioning

confidence: 99%

Realization of planar frequency selective fabrics and analysis of transmission characteristics

Textile Research Journal

Xiao

Shi

et al. 2016

Self Cite

“…To evaluate its highpass characteristics more objectively, the aluminum foil paper sample with the same grid structure was prepared through the computer-based carving process and used for comparison. The involved method and materials were presented in the previous paper [16] and are not repeated in this paper. For comparative purpose, the polarization mode of EM waves was TE mode in the measurement as well as simulation process, and the influence of polarization mode is discussed in the following section.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

Design and Characterization of Periodically Conductive Woven Fabric

Yang

et al. 2019

Autex Research Journal

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In this paper, a novel kind of electromagnetic (EM) functional textiles is proposed, which show high-pass characteristics as they interact with EM waves. The periodically conductive woven fabric was designed, fabricated, and measured. Specifically, by means of unit cell model building and EM simulation, the theoretical S21 (transmission coefficient) and S11 (reflection coefficient) curves were obtained. A concrete sample was fabricated through weaving process, and its transmission characteristics were measured in the microwave anechoic chamber. The measured and simulated results were highly consistent, demonstrating the validity of design process. Compared with the aluminum foil paper sample, the S21 values of fabricated sample were a little smaller, and the reason could be attributed to yarn crimp and surface roughness. The EM characteristics of fabricated sample under two different polarization modes were slightly different, which was due to the beating-up tension of weaving process. The work could offer new research ideas, and the related products have potential advantages over rigid plates on the account of textile characteristics.

“…The samples were fabricated through a computer-based carving process, and relevant machine type and process parameters were introduced. 9 Also, similar instruments, such as the Exploit Thickness Tester and AT510x DC Resistance Tester, were selected to characterize the physical as well as geometric material parameters.…”

Section: Methodsmentioning

confidence: 99%

“…In the two tables, the structure parameters ( p , a , b , c ) correspond with Figure 1(b), and the value of d remained unchanged for all the samples, equivalent to 1.5 mm. Considering that the influence rules of the base fabric and the conductive layer were explored in our previous work, 9 they were no longer investigated in this paper. The substrate of all the samples was plain polyester fabric and the conductive layer was aluminum foil adhesive material, as mentioned above.…”

Section: Methodsmentioning

confidence: 99%

“…[1][2][3][4][5] Based on traditional FSSs, the research idea of frequency selective fabrics (FSFs) was proposed and some research progress has been made recently. [6][7][8][9][10][11] FSFs possess the flexible properties of fabrics and the electromagnetic (EM) effect of FSSs, and therefore they have advantages over the traditional FSSs and would be certainly irreplaceable in particular fields. [12][13][14][15][16] In fact, the previous study on FSFs mainly involved the fabrication process as well as characteristics testing and some FSFs with specific units were designed, such as cross-shaped, square-loop and circular-ring-shaped FSFs.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Research on planar frequency selective fabrics with Jerusalem-shaped units

Textile Research Journal

Xiao

Shi

et al. 2016

Self Cite

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.