Closed-Form Expressions for Numerical Evaluation of Self-Impedance Terms Involved on Wire Antenna Analysis by the Method of Moments

Paez-Rueda, Carlos-Ivan; Fajardo, Arturo; Pérez, Manuel Sierra; Perilla, Gabriel

doi:10.3390/electronics10111316

Cited by 6 publications

(3 citation statements)

References 48 publications

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“…This eventually leads to a linear system of equations with unknown coefficients a k that can be solved after considering the appropriate boundary conditions. MoM has been traditionally applied in the study of wire and planar antennas [36][37][38] as well as in singlelayer reflectarray/transmitarray configurations [39]. These works were then extended to include planar multilayered (2.5-D) devices [40][41][42][43].…”

Section: Integral-equation Methodsmentioning

confidence: 99%

3-D Metamaterials: Trends on Applied Designs, Computational Methods and Fabrication Techniques

2022

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Metamaterials are artificially engineered devices that go beyond the properties of conventional materials in nature. Metamaterials allow for the creation of negative refractive indexes; light trapping with epsilon-near-zero compounds; bandgap selection; superconductivity phenomena; non-Hermitian responses; and more generally, manipulation of the propagation of electromagnetic and acoustic waves. In the past, low computational resources and the lack of proper manufacturing techniques have limited attention towards 1-D and 2-D metamaterials. However, the true potential of metamaterials is ultimately reached in 3-D configurations, when the degrees of freedom associated with the propagating direction are fully exploited in design. This is expected to lead to a new era in the field of metamaterials, from which future high-speed and low-latency communication networks can benefit. Here, a comprehensive overview of the past, present, and future trends related to 3-D metamaterial devices is presented, focusing on efficient computational methods, innovative designs, and functional manufacturing techniques.

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Section: Integral-equation Methodsmentioning

confidence: 99%

3-D Metamaterials: Trends on Applied Designs, Computational Methods and Fabrication Techniques

2022

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“…In addition, although the infinitely narrow gap approximation is very useful, it is much worse than models with finite sources, describes the real physical picture and can lead to difficulties in calculating the imaginary part of the input impedance with great accuracy [8]. Integral equations are solved by the well-known method of moments [9], [10] or some new combined methods [11]. Other numerical methods are also used, for example the method Finite Difference Time Domain [12].…”

Section: Figure 1 Arbitrary Volume Distribution Of Sourcesmentioning

confidence: 99%

Comparative Analysis of Methods for Calculating the Energy Flux Density used in Assessing the Permissible Level of Environmental Pollution by Electromagnetic Radiation

Ďuriš¹,

Иванов²,

Chumarov³

2022

TEM Journal

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In this article, the results of measurements and calculations of the power flux density in the frequency range 670 MHz-766 MHz (46th and 57th television channels) of digital broadcasting of the DVBT2 standard were presented. Experimental data on the power flux density were obtained by the selective electromagnetic field meters NARDA SRM-3000 with an isotropic antenna. The radiating system consists of 16 panel antennas (four-storey panel antennas) with a circular radiation pattern in the horizontal plane. Calculations were carried out in the ПК АЭМО (Software package for electromagnetic environment analysis) and MMANA programs. The data obtained were compared with the permissible exposure limit (PEL) of energy flux density (EFD) set by health and safety rules and standards (2.1.8/2.2.4.1383-03), which operate on the territory of Russia.The values obtained are significantly less than the acceptable levels. In the USA, Japan, European countries, Canada, China, and the PEL of energy flux density in the frequency range 300 MHz – 300 GHz are higher than in Russia.

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“…In the microwave frequency range where radar operates, common targets such as missiles and aircraft, featuring anisotropic material coatings and complex geometries, often exhibit electrically large-scale scattering characteristics. When dealing with such electrically large metallic targets, the efficiency of full-wave EM simulations often diminishes with increasing problem scales [13][14][15][16][17][18]. Highfrequency approximation methods based on approximation theories, while not matching the computational accuracy of full-wave techniques, have garnered attention due to their rapid computation and minimal resource requirements in various engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Efficient EM Scattering Modeling from Metal Targets Coated with Anisotropic Thin Layers

Hua,

2024

Electronics

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To address the challenges posed by composite targets composed of an anisotropic medium and metal in electromagnetic (EM) scattering calculations, this paper introduces an innovative hybrid algorithm tailored for simulating the EM scattering characteristics of such complex targets. Utilizing impedance boundary condition (IBC), the method employs surface impedance vectors to precisely depict the EM properties of the medium. By harnessing the distinct advantages of the Method of Moments (MoMs) at low frequency and Physical Optics (POs) at high frequency, the algorithm ensures both accuracy and efficiency in the EM simulation of composite targets. By transforming the EM scattering problem of targets coated with a thin-layered medium into an equivalent radiation problem of EM currents on impedance surfaces, this research has achieved rapid and high-precision calculations of the Radar Cross Section (RCS) for complex targets with anisotropic medium coatings. To assess the performance of the algorithm, three target models—square plates, simplified aircraft, and complex satellites—are selected as test cases. The dual metrics of RCS and surface current distribution are utilized as evaluation benchmarks, and comparisons are made against the Method of Moments–Finite Element Method (MoM-FEM) hybrid numerical method. The comparative results demonstrate that the proposed method meets the engineering standards in terms of both the root mean square error (RMSE) of RCS and the relative error in surface current distribution, while also achieving a significant improvement of over 50% in computational efficiency, thereby validating its superior accuracy and practical utility.

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Closed-Form Expressions for Numerical Evaluation of Self-Impedance Terms Involved on Wire Antenna Analysis by the Method of Moments

Cited by 6 publications

References 48 publications

3-D Metamaterials: Trends on Applied Designs, Computational Methods and Fabrication Techniques

3-D Metamaterials: Trends on Applied Designs, Computational Methods and Fabrication Techniques

Comparative Analysis of Methods for Calculating the Energy Flux Density used in Assessing the Permissible Level of Environmental Pollution by Electromagnetic Radiation

Efficient EM Scattering Modeling from Metal Targets Coated with Anisotropic Thin Layers

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