Scattering reduction of perfectly electric conductive cylinder by coating plasma and metamaterial

Ji, Jinzu; Jiang, Jiaxin; Chen, Ji; Du, Fei; Huang, Peilin

doi:10.1016/j.ijleo.2018.02.033

Cited by 10 publications

(9 citation statements)

References 11 publications

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“…A novel method by coating plasma and metamaterial is presented to reduce the scattering effects of target, which has a better performance than coated with plasma [191]. Also, a modified Monte Carlo method is utilized to exclude or reduce the scattering effects [192].…”

Section: Scattering Effectsmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

124

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Past few years have witness a dramatic change in the field of terahertz (THz) technology. The recent advancements in the technology for generation, manipulation and detection exploiting THz radiation have brought revolution in the field. Many researchers around the world have been inspired by the potential of invaluable new applications of THz sensing for food and water contamination detection. The microbial pollution in water and food is one the crucial issues with regard to the sanitary state for drinking water and daily consumption of food. To address this risk, the detection of microbial contamination is of utmost importance since the consumption of insanitary or unhygienic food can lead to catastrophic illness. This paper presents a first-time review of the open literature focused on the advances in the THz sensing for microbiological contamination of food and water and state-of-theart network architectures, applications, industrial trends and recent developments. Finally, open challenges and future research directions are presented with in the field.

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Section: Scattering Effectsmentioning

confidence: 99%

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Ren

Zahid

Fan

et al. 2019

Trends in Food Science & Technology

124

View full text Add to dashboard Cite

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“…The same average algorithm is also applied to v xy , v yx and v yy . Then, (11) can be derived as (15)…”

Section: Stable Anisotropic Fdtd Algorithmmentioning

confidence: 99%

“…It has merits of simplicity and the ability to easily model complex geometric, inhomogeneous and anisotropic problems. The FDTD algorithm has been widely employed to analyze the EM characteristics of the plasma sheath [14], radar cross section (RCS) reduction of scattering of perfectly electric conductive (PEC) cylinder coated with plasma and metamaterial [15], and scattering from conducting bodies coated with chiral materials [16]. However, for the multi-scale scattering problem of an object with a thin coating, fine grid size is needed to discretize the thin coating, which leads to a smaller time step due to the Courant-Friedrichs-Lewy stability condition.…”

Section: Introductionmentioning

confidence: 99%

Transformation Optics-Based Finite Difference Time Domain Algorithm for Scattering From Object With Thin Dielectric Coating

et al. 2019

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A proper dielectric coating can reduce the electromagnetic scattering of the conducting object significantly so that it cannot be detected by the radar. However, when the object contains a thin coating, fine grid size is needed to discretize the thin coating in the conventional finite-difference time-domain (FDTD) algorithm, which increases the amount of memory and computational time significantly. To overcome this dilemma, we present a transformation optics-based FDTD (TO-FDTD) algorithm to accelerate the solution of electromagnetic scattering from objects with thin dielectric coatings. Two kinds of novel TO-FDTD models are proposed in this paper for a coated cylinder and a coated arbitrary polygonal cylinder, respectively. Through coordinate transformation, the size of the object remains unchanged while its thin coating is enlarged to a thicker one, meaning that it can be simulated by the FDTD algorithm with uniform coarse grids instead of fine grids. The transformed material parameters become inhomogeneous and anisotropic in the transformed region, which can be obtained by solving a Jacobian transformation matrix. We then develop a stable FDTD algorithm for solving anisotropic Maxwell's equations. Bistatic scatterings of coated cylinders and a coated polygonal cylinder are solved by the TO-FDTD algorithm proposed in this paper, respectively. The result of the TO-FDTD algorithm matches well with the exact value and the result of the commercial software Comsol. The computational efficiency and accuracy of the proposed TO-FDTD algorithm are validated by numerical experiments. Numerical results show that the TO-FDTD algorithm has higher computational accuracy than the conventional FDTD algorithm that fails to simulate the absorbing property of the coating, when the same coarse grid size is used in the simulation. Under the same level of accuracy, the proposed TO-FDTD method can improve the computational efficiency by 62-63 times than the conventional FDTD method with fine grids in the simulations in the paper. INDEX TERMS Coated object, finite-difference time-domain (FDTD), radar cross section (RCS), transformation optics.

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“…In this method, once the target surface and geometry is designed, the aerodynamic requirements of the target have to be satisfied. Although some works have been proposed and applied to many military air platforms and ships by changing their shapes, 3,9,10 their main drawbacks are their fabrication complexity and narrowband behavior. Object coating 11,12 : in coating, a layer is loaded on the target whose characteristics cause the reflected wave to be redirected and the RCSR to be reduced. One of the initial works was proposed by Strifors and Gaunaurd 11 in which the RCS was modified by coating a spherical target with a thin dielectric layer and both the monostatic and bistatic RCSR were computed.…”

Section: Introductionmentioning

confidence: 99%

“…One of the initial works was proposed by Strifors and Gaunaurd 11 in which the RCS was modified by coating a spherical target with a thin dielectric layer and both the monostatic and bistatic RCSR were computed. Recently, in Reference 12, Ji et al have used plasma and metamaterial as coating layers defined and analyzed by finite‐difference time‐domain (FDTD) method for RCSR of a cylinder. Similar to the shaping methods, coatings suffer from narrow RCSR bandwidth and high fabrication complexity. Using absorbent materials : absorbent materials (ie, radar absorbent material (RAM), 13‐22 microwave‐absorbing material (MAM), 21,23‐27 high impedance surface (HIS), 28‐30 and metamaterial absorber (MA)/ perfect metamaterial absorber (PMA) 31‐45 ) have been studied since 1950s 1 .…”

Section: Introductionmentioning

confidence: 99%

Passive techniques for target radar cross section reduction: A comprehensive review

Zaker

Sadeghzadeh

2020

Int J RF Microw Comput Aided Eng

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In this article, a comprehensive review of published techniques for reducing radar cross-section (RCS) of a target in various military and industrial applications is presented. This review contains the developments in this field over the last 24 years. In this comparative review, existing RCS reduction (RCSR) methods are categorized based on the type and the shape of their structures and their electromagnetic behavior and a variety of techniques of passive cancelation for RCSR is presented including the structures formed by both conductor and dielectric such as frequency selective surface, electromagnetic band gap, artificial magnetic conductor, different types of metasurfaces, polarization rotation reflective surface, and their combinations as hybrid techniques. A section is allocated for comparison in which a comprehensive comparison is drawn based on different characteristics of the structures, that is, the number and thickness of substrate layers, complexity and cost, RCSR bandwidth and level, their efficiency for TE and TM polarization, and their pros and cons. Moreover, the standard simulation and measurement setups and different kinds of optimization algorithms such as genetic algorithm, particle swarm optimization, and so on applied for RCS are presented and described. Finally, the conclusion, recommendations for future researches, and a trend of how the topic is possibly moving forward to overcome the main challenges are presented.

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Scattering reduction of perfectly electric conductive cylinder by coating plasma and metamaterial

Cited by 10 publications

References 11 publications

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

State-of-the-art in terahertz sensing for food and water security – A comprehensive review

Transformation Optics-Based Finite Difference Time Domain Algorithm for Scattering From Object With Thin Dielectric Coating

Passive techniques for target radar cross section reduction: A comprehensive review

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