Feasibility Study of Using Electrically Conductive Concrete for Electromagnetic Shielding Applications as a Substitute for Carbon-Laced Polyurethane Absorbers in Anechoic Chambers

Khalid, Tuqa; Albasha, Lutfi; Qaddoumi, Nasser; Yehia, Sherif

doi:10.1109/tap.2017.2670538

Cited by 62 publications

(25 citation statements)

References 15 publications

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“…Electromagnetic (EM) wave absorbers have attracted a lot of interest in technology, because of their vast range of applications in photovoltaics 1 – 4 , shielding 5 , 6 , thermal imaging 7 – 9 , sensing 10 – 12 , photodetection 13 – 17 , and thermal emission-based cooling 18 , 19 . With the advent of plasmonics 20 and metamaterials, it became possible to design absorbers with ultra-thin sub-wavelength thicknesses, which is of high importance for optical packed circuit integration and the reduction of mass and cost of structures.…”

Section: Introductionmentioning

confidence: 99%

Large-Area, Cost-Effective, Ultra-Broadband Perfect Absorber Utilizing Manganese in Metal-Insulator-Metal Structure

Aalizadeh

Khavasi

Bütün

et al. 2018

Sci Rep

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Achieving broadband absorption has been a topic of intensive research over the last decade. However, the costly and time consuming stage of lithography has always been a barrier for the large-area and mass production of absorbers. In this work, we designed, fabricated, and characterized a lithography-free, large-area compatible, omni-directional, ultra-broadband absorber that consists of the simplest geometrical configuration for absorbers: Metal-Insulator-Metal (MIM). We introduced and utilized Manganese (Mn) for the first time as a very promising metal for broadband absorption applications. We optimized the structure step-by-step and compared Mn against the other best candidates introduced so far in broadband absorption structures and showed the better performance of Mn compared to them. It also has the advantage of being cheaper compared to metals like gold that has been utilized in many patterned broadband absorbers. We also presented the circuit model of the structure. We experimentally achieved over 94 percent average absorption in the range of 400–900 nm (visible and above) and we obtained absorption as high as 99.6 percent at the wavelength of 626.4 nm. We also experimentally demonstrated that this structure retains broadband absorption for large angles up to 70 degrees.

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Section: Introductionmentioning

confidence: 99%

Large-Area, Cost-Effective, Ultra-Broadband Perfect Absorber Utilizing Manganese in Metal-Insulator-Metal Structure

Aalizadeh

Khavasi

Bütün

et al. 2018

Sci Rep

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“…57 A conductive concrete has been proposed as alternative for commercially available carbon-laced polyurethane absorbers used in microwave anechoic chambers. 9 It has been prepared by the addition of carbonaceous materials such as carbon black, graphite powder, carbon fibers and steel fibers in concrete material. The dispersed carbonaceous particles cause multiple internal reflections and produce eddy currents within the concrete material which in turn increases the shielding effectiveness.…”

Section: Carbon-based Materialsmentioning

confidence: 99%

“…8 A conductive concrete material with superior shielding effectiveness has been developed as an economical material for designing pyramidal absorbers in anechoic chambers by incorporating carbon black, graphite and steel fibers in polymer matrix. 9 The anisotropic nature of ferrites has been utilized in designing non-reciprocal devices from the early days of microwave device fabrication. Later on, the requirement of more compact and highperformance microwave devices has led to the synthesis and characterization of magnetic nanocomposites, ferromagnetic thin films and ferromagnetic microwires.…”

Section: Introductionmentioning

confidence: 99%

Applications of Microwave Materials: A Review

Raveendran

Sebastian

Raman

2019

Journal of Elec Materi

147

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The performance of microwave devices mainly depends on the properties of materials used in the fabrication. Knowledge of material properties at microwave frequencies is a prerequisite to select suitable materials for various microwave applications and vice versa. In this review, seven categories of materials and their applications in a microwave regime are elaborately discussed. The categories include magnetic materials, carbon-based materials, flexible or stretchable materials, biomaterials, phantoms, tunable materials and metamaterials. A brief overview of other important microwave materials such as low-loss ceramic dielectric materials, low-loss polymer ceramic composites, glass ceramics and multilayer ceramics is also given. The objective of this review is to expose the world of materials for wide microwave applications and thereby properly assisting the material selection for specific applications. Moreover, this review has dual significance. It helps material scientists to develop new materials and modify the properties of the available materials with respect to the application requirements. It also assists microwave engineers to select and use appropriate materials for different microwave applications.

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“…However, most polymers are derived from petrochemicals [1]. Polyurethane (PU) resin is one of the widely used materials with great potential for multipurpose applications due to its excellent physical, chemical, and mechanical properties [2,3,4,5,6,7,8]. Industrial processing of these compounds is still widely carried out by relying on the processing of petrochemical industries, where raw materials derived from natural gas and petroleum are limited and cannot be renewed [9].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Polyurethane Monolithic Resins and Modification with a Condensed Tannin-Yielding Self-Healing Property

et al. 2019

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Resins of polyurethane were prepared from vegetable oils (crambe and castor) and modified by adding green corrosion inhibitor (condensed tannin). The oils were characterized by gas chromatography with flame-ionization detection (GC-FID), attenuated total reflectance Fourier transform infrared spectroscopy (FTIR-ATR) and thermogravimetric analysis (TGA). The reaction was monitored by characterizing the intermediate products (polyester and prepolymer). The polyester was characterized by solubility in methanol, acidity index, hydroxyl groups and FTIR-ATR, and the prepolymer was characterized by solid content, solvent content, isocyanate (NCO) groups and FTIR-ATR. The formation of PU resins was confirmed by FTIR-ATR and TGA, and the presence of tannin particles incorporated in the coating can be observed by optical microscopy (OM). The absence of the band attributed to NCO in FTIR-ATR spectra of the resins confirmed the complete reaction between polyester and prepolymer. The OM observation and a video demonstrate that Polyurethane (PU)-modified with condensed tannin resin presents self-healing effect, probably through the formation of new hydrogen bonds when in contact with deionized water. Therefore, these results open possibilities for new synthetic routes aiming at improving the very important self-healing property for protecting metals and their alloys against corrosion, extending significantly the metallic materials lifetime as previously demonstrated by our group.

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Feasibility Study of Using Electrically Conductive Concrete for Electromagnetic Shielding Applications as a Substitute for Carbon-Laced Polyurethane Absorbers in Anechoic Chambers

Cited by 62 publications

References 15 publications

Large-Area, Cost-Effective, Ultra-Broadband Perfect Absorber Utilizing Manganese in Metal-Insulator-Metal Structure

Large-Area, Cost-Effective, Ultra-Broadband Perfect Absorber Utilizing Manganese in Metal-Insulator-Metal Structure

Applications of Microwave Materials: A Review

Preparation of Polyurethane Monolithic Resins and Modification with a Condensed Tannin-Yielding Self-Healing Property

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