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عنوان فارسی مقاله:
فراماده باند پهن بر اساس RF جاذب در باند X
عنوان انگلیسی مقاله:
Metamaterial based broadband RF absorber at X-band
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Metamaterials are periodically arranged new type of composites that exhibit exceptional electromagnetic properties not readily observed in nature. One of the features discovered in recent years is performing perfect absorption against the incident electromagnetic wave. Due to their simple design, easy fabrication process, perfect and broadband absorption features as well as tunable and controllable absorption characteristics, metamaterial absorbers can be used in stealth technology toward remote sensing applications over a significant range of electromagnetic spectrum from microwave to optics. Stealth technology which is a valuable research area for electronic warfare provides passive counter-measurement. It is a combination of technologies to reduce the distances at which a target can be detected. Stealth applications particularly deal with radar cross section reduction (RCS). RCS of relevant targets can be defined as the visibility in radar or the amount of reflected radar signal [1]. Therefore, reduction of RCS is important for military and electronic warfare applications. Current techniques to reduce radar cross section are mainly based on shaping the surface of target and absorbing the incident electromagnetic wave. Shaping the target is a good technique but not enough in itself for desired purpose because of poor aerodynamic performance, increased costs and more maintenance requirements. Due to these drawbacks of shaping the target, radar absorbing materials are also necessary for stealth technology. For the radar absorbing materials, design, weight, thickness, absorptivity, environmental resistance and mechanical strength are the key factors. Moreover, development of radar absorbing materials with low density and high strength is a challenging task. Compared to the conventional microwave absorbers, metamaterial based absorbers can be an alternative solution of reducing RCS due to the high absorption, low density, thin thickness and unlimited frequency performance over a large range of electromagnetic spectrum. The first and probably the most known definition of metamaterials is the one composed by metal and dielectric materials exhibiting simultaneously negative real parts of both permittivity (er) and permeability (lr) [2]. Having simultaneously negative er and lr, incident wave in the metamaterials has different properties such as backward wave propagation, negative refractive index and phase velocity. With their unique properties, they get considerable interest about lens with perfect focusing [3], cloaking [4], antenna radiation [5] and electromagnetic wave absorption [6] applications. As electromagnetic wave absorbers, they can be used forradar cross section reduction [7], decreasing sidelobe radiation in antennas and the reduction of electromagnetic interference [8]. First studies about metamaterials have looked at its negative index of refraction property. Victor G. Veselago was the first scientist who started to work on this property in 1968 [9]. The first experimental verification of negative index of refraction was con- firmed by Sir John Pendry et al. [10]. Landy et al. have studied the use of metamaterials as electromagnetic wave absorbers with near perfect absorption in 2008 for the first time [11]. Following on the study of Landy, Wang et al. [6] and Cheng et al. [12] presented polarization insensitive and wide angle metamaterial absorbers. After that, a resonant absorber with three-layer unit cell was presented by Li et al. [13]. Moreover, Lee et al. designed a bandwidth-enhanced microwave absorber where two absorption peaks were not far away from each other, unlike other dual band absorbers [14]. Two well known Electric Field Driven LC (ELC) resonator structure were combined to obtain dual band absorbance [15]. The proposed absorber had two distinct frequency of absorption near to 5.5 GHz and 9.5 GHz with peak absorbance of 99.1% and 99.9%, respectively. By comprising of 2 2 array of absorber [15] oriented in different directions, a triple band polarization insensitive absorption was achieved [16]. On the other hand, Bian et al. [17], Bhattacharyya et al. [18] and Ayop et al. [19] prepared the unit cell of the metamaterial consisting of concentric square and circular rings with three distinct absorption peaks with having several characteristics like wide-angle and polarizationinsensitivity. However, each absorption bandwidth was still very narrow due to the resonant behavior of metamaterial elements, limiting the potential application of these absorbers in the fields of cloaking and stealth technology.
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کلمات کلیدی:
PDF]Metamaterial based broadband RF absorber at X-band iranarze.ir/wp-content/uploads/2016/10/E142.pdf band (8–12 GHz) metamaterial broadband absorber are presented. An absorber operating in the middle of the microwave X-band is obtained by selecting ... Metamaterial Based Broadband RF Absorber at X-band - ResearchGate https://www.researchgate.net/.../302919329_Metamaterial_Based_Broadband_RF_Absor... Metamaterial Based Broadband RF Absorber at X-band on ResearchGate, the professional network for scientists. X-band Metamaterial Absorber with Dual band/Broadband Absorption ... ieeexplore.ieee.org/iel7/7400054/7411332/07411380.pdf by M Agarwal - 2015 - Cited by 1 - Related articles 2015 IEEE International Microwave and RF Conference (IMaRC). X-band Metamaterial Absorber with Dual band/Broadband Absorption Characteristics. Mayank ... Ultra-broadband Microwave Metamaterial Absorber - at www.arxiv.org. https://arxiv.org/pdf/1201.0062 by F Ding - 2011 - Cited by 285 - Related articles Ultra-broadband Microwave Metamaterial Absorber. Fei Ding1 ... method to extend the absorption band is to make the MA units resonate at several ... used in the x and y directions, and a plane wave is incident downward on the MA with. [PDF]MICROWAVE ABSORBING MATERIALS - Mouser Electronics www.mouser.com/catalog/specsheets/Laird_4024.pdf Microwave absorbers are increasingly being used to enhance shielding .... dual-band absorber with appropriate resonant points will have greater than 15dB absorption ... FIGURE 5. Broadband-graded reticulated foam absorber 1.25" (31.8 mm) thick. ..... offered in nominal sizes of 24" x 24" (609.6 mm x 609.6 mm), although ... [PDF]A Thin and Broadband Microwave Absorber Based on Magnetic ... www.jpier.org/PIERC/pierc56/09.14122203.pdf by D Wan - 2015 - Cited by 4 - Related articles Feb 7, 2015 - Abstract—To achieve broadband microwave absorption, a three-layer .... impedance-matching frequencies are within X band and Ku band. [PDF]Microwave Absorber Selection Guide - ETS-Lindgren www.ets-lindgren.com/pdf/absorber.pdf 100% of our microwave absorbers are tested for reflectivity ..... ETS-Lindgren EHP pyramidal absorber is an ultra broadband microwave ... 8 - 12 GHz X-Band. Ultra-wideband microwave absorber by connecting multiple ... https://www.ncbi.nlm.nih.gov › NCBI › Literature › PubMed Central (PMC) by X Yin - 2015 - Cited by 4 - Related articles Oct 19, 2015 - Ultra-wideband microwave absorber by connecting multiple ... has wide but different absorption bands due to broadband slow-light response, into a unit cell. ... The lattice constants along x and y-direction of the single-sized ... Simple and Low-Cost Dual-Band Printed Microwave Absorber for 2.4 ... www.degruyter.com/view/j/freq.ahead-of-print/freq-2016.../freq-2016-0252.xml Mar 16, 2017 - The proposed absorber is suitable for a variety of applications requiring ... Meshram, X-band metamaterial absorber with dual band/broadband ...
