Study on frequency selective/absorption/reflection multilayer composite flexible electromagnetic interference shielding fabric

2021 ◽  
pp. 004051752110417
Author(s):  
Hengyu Zhang ◽  
Jianying Chen ◽  
Hui Ji ◽  
Ni Wang ◽  
Hong Xiao
Keyword(s):  
Transmission Coefficient ◽  
Carbonyl Iron ◽  
Functional Materials ◽  
Frequency Selective Surface ◽  
Woven Fabric ◽  
Shielding Effect ◽  
Selective Absorption ◽  
Frequency Selective Surfaces ◽  
Coated Fabric ◽  
Frequency Selective

Three kinds of electromagnetic functional materials, frequency selective surface, carbonyl iron coated absorbing fabric and conductive woven fabric, were laminated to filter, absorb and reflect electromagnetic waves. Through equivalent circuit analysis, the frequency selection characteristics and the correlation between the shape and size of the periodic structure of cross-shaped and Jerusalem-shaped frequency selective surfaces were studied. It is found that frequency selective surfaces can reduce the transmission coefficient of carbonyl iron coated fabric at the resonance point, so that the working frequency band of the composite shielding material can be controlled and adjusted. The stacking order has no effect on the frequency selective surface/frequency selective surface double-layer materials, but influence the transmission coefficient of composite materials with frequency selective surface superimposed carbonyl iron coated fabric and/or conductive woven fabric. Among all samples, the transmission coefficient of Jerusalem-shaped/carbonyl iron coated fabric-3/conductive woven fabric has the most strong shielding effect, which is up to −51.72 dB at 10.48 GHz. It is proved that using flexible fabric as the matrix and compounding materials with different electromagnetic functions is an effective method to realize high efficiency and adjustable electromagnetic shielding ability.

scholarly journals Optically Transparent Tri-Wideband Mosaic Frequency Selective Surface with Low Cross-Polarisation

Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 622
Author(s):  
Nur Biha Mohamed Nafis ◽  
Mohamed Himdi ◽  
Mohamad Kamal A Rahim ◽  
Osman Ayop ◽  
Raimi Dewan
Keyword(s):  
Frequency Selective Surface ◽  
Performance Comparison ◽  
Unit Cell ◽  
Frequency Selective Surfaces ◽  
Transportation Services ◽  
Optically Transparent ◽  
Metallic Element ◽  
Frequency Selective ◽  
High Level ◽  
Polycarbonate Substrate

Acquiring an optically transparent feature on the wideband frequency selective surface (FSS), particularly for smart city applications (building window and transportation services) and vehicle windows, is a challenging task. Hence, this study assessed the performance of optically transparent mosaic frequency selective surfaces (MFSS) with a conductive metallic element unit cell that integrated Koch fractal and double hexagonal loop fabricated on a polycarbonate substrate. The opaque and transparent features of the MFSS were studied. While the study on opaque MFSS revealed the advantage of having wideband responses, the study on transparent MFSS was performed to determine the optical transparency application with wideband feature. To comprehend the MFSS design, the evolutionary influence of the unit cell on the performance of MFSS was investigated and discussed thoroughly in this paper. Both the opaque and transparent MFSS yielded wideband bandstop and bandpass responses with low cross-polarisation (−37 dB), whereas the angular stability was limited to only 25°. The transparent MFSS displayed high-level transparency exceeding 70%. Both the simulated and measured performance comparison exhibited good correlation for both opaque and transparent MFSS. The proposed transparent MFSS with wideband frequency response and low cross-polarisation features signified a promising filtering potential in multiple applications.

Study on Analysis and Simulation of Novel Frequency Selective Surfaces

2014 ◽  
Vol 1049-1050 ◽  
pp. 790-793
Author(s):  
Yan Xin Yu ◽  
Chun Yang Wang ◽  
Yan Jun Sun ◽  
Wen Ting Jiang
Keyword(s):  
Surface Film ◽  
Simulation Method ◽  
Frequency Selective Surface ◽  
Total Reflection ◽  
Frequency Selective Surfaces ◽  
The Finite Element Method ◽  
Reflection And Transmission ◽  
Unit Structure ◽  
Ansoft Hfss ◽  
Frequency Selective

Frequency selective surface (FSS) is a two-dimensional periodic structure. It exhibits total reflection and transmission in the neighborhood of the element resonances. As it performs as a filter, FSS is widely used in the fields of microwave and optics. In this paper, the finite element method is used to analysis frequency selective surface and study on the feasibility of Ansoft HFSS software for frequency selective surface simulation. Hexagonal element of frequency selective surface is as an example to explore the simulation method and the process of Ansoft HFSS. Through the comparison of the simulation curves and the measured curves of hexagonal element frequency selective surface film by photoetching technology, the simulation method of Ansoft HFSS software for frequency selective surface is correct. At the same time, this paper further verified the reliability of the simulation through the example of the ring and the cross unit structure.

scholarly journals Characterization of the koch fractal hexagonal loop frequency selective surface for X-band application

2020 ◽  
Vol 20 (2) ◽  
pp. 878
Author(s):  
Nur Biha Binti Mohamed Nafis ◽  
Mohamad Kamal Bin A. Rahim ◽  
Osman Bin Ayop ◽  
Huda Bin A MAjid ◽  
Sunti Tuntrakool
Keyword(s):  
Resonant Frequency ◽  
Transmission Coefficient ◽  
Parametric Analysis ◽  
Frequency Selective Surface ◽  
Angular Stability ◽  
X Band ◽  
Koch Fractal ◽  
Frequency Selective ◽  
Incident Polarization

<p>This paper presented the bandstop Koch fractal hexagonal loop frequency selective surface (FSS) for the X-band application. The simulated transmission coefficient response (S_21) had been obtained by using CST software. The proposed Koch fractal hexagonal loop FSS structure is highly insensitive towards angular stability and also incident polarization up to 60 degree , with deviation of resonant frequency,  f_r below than 1%. The parametric analysis on the effect of the periodicity, width, and height of the fractal FSS structure on the S_21 has been illustrated and discussed thoroughly.</p>

scholarly journals A Broadband Linear-to-Circular Transmission Polarizer Based on Right-Angled Frequency Selective Surfaces

2017 ◽  
Vol 2017 ◽  
pp. 1-6 ◽  
Author(s):  
Wei Zhang ◽  
Jian-ying Li ◽  
Jian Xie
Keyword(s):  
Insertion Loss ◽  
Incident Angle ◽  
Frequency Selective Surface ◽  
Experimental Results ◽  
Frequency Selective Surfaces ◽  
Transmission Coefficients ◽  
High Transmission ◽  
X Band ◽  
Low Insertion Loss ◽  
Frequency Selective

A broadband linear-to-circular transmission polarizer using a right-angled frequency selective surface is presented in this paper. The new proposed polarizer has both advantages of wide operational bandwidth and high transmission coefficients. To verify the design, a new polarizer working in X-band is optimized and fabricated. Experimental results show that the measured axial ratios lower than 3 dB range from 6.42 to 13.70 GHz, with low insertion loss. Meanwhile, the polarizer can operate over a broad range of frequencies from 6.75 to 10.75 GHz, when the incident angle increases to 25°.

scholarly journals Analyze of Frequency Selective Surfaces By Hybrid MOM-PO-GTD Method

2019 ◽  
Author(s):  
samir mendil ◽  
Taoufik Aguili
Keyword(s):  
Hybrid Method ◽  
Moment Method ◽  
Performance Metrics ◽  
Frequency Selective Surface ◽  
Frequency Selective Surfaces ◽  
Incoming Wave ◽  
Periodic Surface ◽  
New Approach ◽  
Frequency Selective ◽  
Microwave Regime

Abstract This article intends to analyze the Diraction phenomena of the incoming wave and provide a new approach for analyzing the frequency selective surface (Fss) by using a hybrid method combining Moment Method (MoM), optical physics (PO) with General theory of Diffraction (GTD). the frequency selective surface (Fss) is a periodic surface with identical two-dimensional arrays of elements arranged on a substrate dielectric. An incoming plane wave will either be transmitted (bandwidth) or reflected (stopband), completely or partially, depending on the nature of the array element. Today, FSSs have been extensively studied and there is tremendous growth in its design and implementation for different applications at the microwave to optical frequency ranges. In this review article, we present a new hybrid method form on Moment method and GTD for analyzing different categories of FSS based on the design of the structure, the array elements used, and applications. We also focus on the effects of diffraction, methodology, experimental verications of design examples, as well as on prospects and challenges, particularly in the microwave regime. We highlight their important performance metrics, especially about progress in this area could facilitate advanced electromagnetic innovation.

Characterization of Radome Materials Comprising LTCC-Derived FSS on a Quartz Glass Plate

2014 ◽  
Vol 915-916 ◽  
pp. 679-684 ◽  
Author(s):  
Xi Geng Miao ◽  
Qing Wen Feng ◽  
Fabrizia Ghezzo ◽  
Xiao Wei Fang ◽  
Yu Tao Yue ◽  
...  
Keyword(s):  
High Temperature ◽  
Quartz Glass ◽  
Glass Plate ◽  
Frequency Selective Surface ◽  
Frequency Selective Surfaces ◽  
Low Dielectric ◽  
Unit Cells ◽  
Potential Benefits ◽  
Ceramic Glass ◽  
Frequency Selective

Frequency selective surfaces (FSS) and recent metamaterials (MTM) have shown unique electromagnetic characteristics and are of potential benefits for radome applications. To make the radomes/windows high-temperature resistant, the substrates of the frequency selective surfaces or metamaterials should be made of ceramic/glass-based materials of a low dielectric constant and a low loss tangent. However, fabricating ceramic/glass-based FSS or MTM is always challenging. In this paper, a constrained low-temperature co-fired ceramic (LTCC) technique was used to produce quartz glass-based radome material consisting of a frequency selective surface (FSs) layer embedded in a surface laminate. Due to the constrained sintering shrinkage, the geometry and the dimensions of the unit cells of the FSs were not subjected to significant variations and thus the measured electromagnetic (EM) wave transmission spectra matched those of the computer simulation results quite well. This preliminary work marks the beginning of our long-term efforts toward the goal of achieving high-temperature resistant, highly electromagnetic wave transparent, as well as carefullydesigned and fabricated radome materials.

scholarly journals Quad-band FSS for Electromagnetic Shielding

2021 ◽  
Vol 3 (1) ◽  
pp. 1-14
Author(s):  
Alka Singh ◽  
Chitra Singh
Keyword(s):  
Electromagnetic Radiation ◽  
Medical Devices ◽  
Frequency Selective Surface ◽  
Electromagnetic Shielding ◽  
Unit Cell ◽  
Frequency Selective Surfaces ◽  
Novel Method ◽  
Frequency Selective

In this paper, a novel method to design Quad-band stop frequency selective surface (FSS) is proposed to shield medical/non-medical devices from electromagnetic radiation of wifi/Bluetooth, GPS,1G, 2G, 3G, 4G and 5G frequencies. The proposed device can also be used in security and surveillance devices to protect them from electromagnetic attack. The FSS unit cell consists of convoluted structures on FR4 substrate. The study was performed by designing individual frequency selective surfaces for 1G, 2G, Wi-Fi/Bluetooth, GPS, 4G and 5G, then combining it to form a single Quad-band FSS unit.

Screen Printed Frequency-Selective Surfaces on Rigid, Flexible and Elastic Substrates

2006 ◽  
Vol 964 ◽  
Author(s):  
Thomas Kistenmacher ◽  
Shaun Francomacaro ◽  
Ben Brawley ◽  
Ra'id Awadallah ◽  
Paul Vichot ◽  
...  
Keyword(s):  
Screen Printing ◽  
Low Cost ◽  
Frequency Selective Surface ◽  
Flexible Substrates ◽  
Frequency Selective Surfaces ◽  
Quality Factors ◽  
Split Ring ◽  
Elastic Substrates ◽  
Frequency Selective ◽  
Screen Printed

ABSTRACTA series of frequency-selective surface (FSS) arrays based on nested split-ring triangle resonators have been fabricated using screen printing. A silver-filled polymer thick film (PTF) paste was selected as the active medium for the FSS arrays as it has good compatibility with the various substrates employed and is in itself naturally flexible. Substrates included FR4 boards and polyimide (PI), polyethylene terephthalate (PET) and silicone sheeting. Compared to arrays fabricated from Cu-clad FR4 board, the screen-printed arrays are resonance shifted owing to the magnitude of the dielectric constant and thickness of the various substrates. In addition, the quality factors of the screen-printed arrays are reduced compared to those fabricated from the more conductive Cu resonators. Despite these limitations, screen-printed arrays have considerable potential as components for low-cost flexible and conformal microwave devices.

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