K- and W-Band Free-Space Characterizations of Highly Conductive Radar Absorbing Materials

Vohra, Nagma; El-Shenawee, Magda

doi:10.1109/tim.2020.3041821

Cited by 24 publications

(11 citation statements)

References 41 publications

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“…Among the others, for samples of small dimensions, methods include the coaxial transmission line method [29][30][31][32] or waveguide methods (see, e.g., [33]) and the reverberation chamber method [34,35]. In the case of large size samples, free-space measurement [36], shielded room [7] and transmission measurements in anechoic chamber [37] are generally used.…”

Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

et al. 2022

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Shielding against electromagnetic interference (EMI) is a critical issue in civil applications generally solved with metal screens. In recent years, the properties of many composite materials filled with carbon nanotubes or graphene or materials with a carbon-based coating have been analysed with the aim of using them for electromagnetic shielding applications. Among other carbon materials, biochar, derived from biomass and characterized by high carbon content, emerges as a sustainable, renewable, environmentally friendly, and inexpensive material. In this paper, commercial biochar thermally treated at 750 °C is used to coat with several layers common building components such as drywall panel. Shielding effectiveness is measured in the frequency band 1–18 GHz for normal incidence and skew angles 10, 20 and 30 deg in a full anechoic chamber with double ridged, vertically and horizontally polarized broadband horn antennas. The results show that the proposed biochar-coated drywall panels provide a good shielding effectiveness compared to similar solutions, with the advantage of a less expensive and easier to realize building material

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Section: Introductionmentioning

confidence: 99%

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

et al. 2022

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“…A survey is performed among a plethora of published references, among them references [40][41][42][43][44][45][46][47][48][49][50][51] are selected to configure RAM of good contrasted 𝜖 𝑟 and 𝜇 𝑟 combinations.…”

Section: Selection Of Ram Complex Permittivitymentioning

confidence: 99%

On the Radar Absorbing Material Reflectivity and Electromagnetic Interference Shielding Effectiveness

Sallam¹

2022

Preprint

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<p>The goal of this work is to examine radar absorbing material (RAM)reflectivity (R)through a frequency (f) range from 0.5 GHz to 40 GHz. Variation of nonmagnetic, homogeneous, and non-dispersive RAMR is reformed to facilitate calculations. Effect of dielectric parameters (E and u) on R for one layer-metal-packed RAM with two different thicknesses are given. Electromagnetic interference shielding effectiveness (EMISE)reflection loss (R), absorption loss (A), and internal loss (M)for one and two layers located between two semi-infinite free space media are derived. Attenuation (a)variations with f, e, u, and layer thickness for single and double layer are given in graphical form.</p>

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“…However, the research of this aspect is still slow, and the existing mainly focuses on the numerical model calculation [ 4 ], structural characteristics [ 5 ], performance improvement [ 6 , 7 ], influencing factors analysis [ 8 , 9 ], test evaluation [ 10 ], new product development [ 11 , 12 ], and new mechanism research [ 13 , 14 ]. At present, improving the SE of the EMS fabric and retaining the inherent porous characteristics lack effective methods.…”

Section: Introductionmentioning

confidence: 99%

Shielding Performance of Electromagnetic Shielding Fabric Implanted with “Split-Ring Resonator”

2023

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The electromagnetic shielding (EMS) fabric is an important electromagnetic protection product, which is widely applied in various fields. The improvement of its shielding effectiveness (SE) has always been the focus of research. This article proposes to implant a metamaterial structure of a “split-ring resonator (SRR)” in the EMS fabrics, so that the fabric not only maintains the porous and lightweight characteristics, but also obtains the SE improvement. With the help of the invisible embroidery technology, stainless-steel filaments were used to implant hexagonal SRRs inside the fabric. The effectiveness and influencing factors of the SRR implantation were described by testing the SE of the fabric and analyzing the experimental results. It was concluded that the SRR implantation inside the fabric can effectively improve the SE of the fabric. For the stainless-steel EMS fabric, the increase amplitude of the SE reached between 6 dB and 15 dB in most frequency bands. The overall SE of the fabric showed a decrease trend with the reduction of the outer diameter of the SRR. The decrease trend was sometimes fast and sometimes slow. The decreasing amplitudes were different in various frequency ranges. The number of embroidery threads had a certain effect on the SE of the fabric. When other parameters remained unchanged, the increase of the diameter of the embroidery thread resulted in the increase of the SE of the fabric. However, the overall improvement was not significant. Finally, this article also points out that other influencing factors of the SRR need to be explored, and the failure phenomenon may occur under certain situations. The proposed method has the advantages of the simple process, convenient design, no pore formation, SE improvement retaining the original porous characteristics of the fabric. This paper provides a new idea for the design, production, and development of new EMS fabrics.

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K- and W-Band Free-Space Characterizations of Highly Conductive Radar Absorbing Materials

Cited by 24 publications

References 41 publications

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

Shielding Effectiveness Measurements of Drywall Panel Coated with Biochar Layers

On the Radar Absorbing Material Reflectivity and Electromagnetic Interference Shielding Effectiveness

Shielding Performance of Electromagnetic Shielding Fabric Implanted with “Split-Ring Resonator”

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