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We present an accurate method of moments (MoM) solution the combined field integral equation (CFIE) using multilevel fast multipole algorithm (MLFMA) for scattering by large, three-dimensional (3-D), arbitrarily shaped, homogeneous objects. first investigate several different MoM formulations CFIE and propose a new formulation, which is both free interior resonances. then employ MLFMA to significantly reduce memory requirement computational complexity solution. Numerical results are...

By complex coordinate stretching and a change of variables, it is shown simply that PML reflectionless for all frequencies angles. Also, Maxwell's equations media reduce to ordinary with systems. Many closed-form solutions map corresponding in Numerical simulations the show metallic boxes lined are highly absorptive. These lend better understanding absorptive properties media. For instance, they explain why medium when dielectric or interface extends edge simulation region where reside. More...

A novel numerical technique is proposed for the electromagnetic characterization of scattering by a three-dimensional cavity-backed aperture in an infinite ground plane. The combines finite element and boundary integral methods to formulate system equations solution fields those inside cavity. Specifically, method used cavity region, approach conjunction with equivalence principle represent above Unlike traditional approaches, does not require knowledge cavity's Green's function is,...

A hybrid numerical technique is presented for a characterization of the scattering and radiation properties microstrip patch antennas arrays residing in cavity recessed ground plane. The combines finite-element boundary integral methods to formulate system solution fields at aperture those inside via biconjugate gradient method conjunction with fast Fourier transform (FFT). By virtue method, proposed applicable on or embedded layered dielectric substrate also capable treating various feed...

A novel dual-primal non-overlapping domain decomposition method (DDM) for the finite element solution of three-dimensional (3D) large-scale electromagnetic problems is proposed. This reduces computational complexity from solving original 3D problem to an equivalent interface by utilizing idea tearing and interconnecting (FETI-DPEM) method. The new method, which referred as FETI-DPEM2, combines with two Lagrange multipliers implements Robin-type transmission condition at subdomain interfaces...

Abstract With the rapid growth in intelligent metasurfaces recent years, deep learning has attracted attention to transform ways which are simulated and designed. The unique advantages of lie powerful data‐driven modality, allows a computational model learn useful information using hierarchically structured layers. Among various successful examples, there forward inverse designs. However, such designs inherently data‐hungry. Thus, data utilization efficiency must be maximized, green...

A Lagrange multiplier based non-overlapping domain decomposition method, referred to as the dual-primal finite element tearing and interconnecting (FETI-DP), is formulated for simulation of large, three-dimensional (3-D) electromagnetic problems. This formulation extends FETI-DP solving scalar Helmholtz equation solution vector curl-curl wave using edge-based elements. It enforces field continuity explicitly along edges shared by more than two subdomains implicitly at interfaces between...

A hybrid finite-element method is applied to solve the electromagnetic scattering (for both E- and H-polarizations) from coated cylinders. The coating material can be nonhomogeneous have permeabilities permittivities different their free-space values. Three numerical examples are presented show validity versatility of method: (1) bistatic a circular cylinder which verifies formulation computer program, (2) backscattering rectangular cylinder, (3) an ogival with edges. Computations compared...

The finite-difference time-domain (FDTD) method is combined with the of moments (MoM) to compute electromagnetic fields shielded radio-frequency (RF) coils loaded an anatomically accurate model a human head for high-frequency magnetic resonance imaging (MRI) applications. can predict both specific energy absorption rate (SAR) and field (known as B1 field) excited by any RF coils. Results SAR distribution, end-capped birdcage coils, are calculated at 64, 128, 171, 256 MHz. results show that...

A modeling of metasurfaces in the finite-element method (FEM) based on generalized sheet transition conditions (GSTCs) is presented. The discontinuities electromagnetic fields across a metasurface as represented by GSTC are modeled assigning nodes to both sides metasurface. FEM-GSTC formulation 1-D and 2-D domains derived implemented. extended handle more general bianistroptic metasurfaces. formulations validated several illustrative examples.

A multi-GPU implementation of the multilevel fast multipole algorithm (MLFMA) based on hybrid OpenMPCUDA parallel programming model (OpenMP-CUDA-MLFMA) is presented for computing electromagnetic scattering a three-dimensional conducting object. The proposed hierarchical parallelization strategy ensures high computational throughput GPU calculation. resulting OpenMP-based capable solving real-life problems with over one million unknowns remarkable speed-up. radar cross sections few benchmark...

An electrical-thermal co-simulation based on the finite element method is presented for analysis of high-power RF/microwave circuits. The integrates a full-wave electromagnetic and transient thermal through an iterative scheme, devised design circuits operated at high frequencies power levels. To enhance efficiency in solving large-scale problems, domain decomposition scheme called tearing interconnecting adaptive time-stepping algorithm proportional-integral-derivative control are...

An efficient algorithm combining the adaptive integral method and discrete complex-image (DCIM) is presented in this paper for analyzing large-scale microstrip structures. The arbitrarily shaped microstrips are discretized using triangular elements with Rao-Wilton-Glisson basis functions. These functions then projected onto a rectangular grid, which enables calculation of resultant matrix-vector product fast Fourier transform. retains advantages well-known conjugate-gradient...

A special higher order finite-element method is presented for the analysis of electromagnetic scattering from a large, deep, and arbitrarily shaped open cavity. This exploits unique features equations and, more importantly, problem by large deep It designed in such manner that it uses minimal memory, which proportional to maximum cross section cavity independent depth cavity, its computation time increases only linearly with Furthermore, computes scattered fields all angles incidence without...

A fast full-wave analysis technique that can be used to analyze the scattering and radiation from large finite arrays of microstrip antennas is presented. The discretizes mixed potential integral equation (MPIE) in spatial domain by means a discrete complex image method. del operators on Green's functions are transferred singular kernel expansion testing functions. resultant system equations solved using biconjugate gradient (BCG) method which matrix-vector product evaluated efficiently...

A higher-order perfectly matched layer (PML) is proposed based on stretched coordinates to effectively attenuate both propagating and evanescent waves. The new PML has multiple poles in contrast the regular with a single pole. implementation also derived results are shown be better than those of recently complex-frequency shifted (CFS) an insignificant increase computational cost.

An edge-based finite element formulation with vector absorbing boundary conditions is presented for scattering by composite structures having boundaries satisfying impedance and/or transition conditions. Remarkably accurate results are obtained placing the mesh a small fraction of wavelength away from scatterer.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

A hybrid finite-element-boundary-integral formulation for scattering and radiation by 2-D 3-D composite structures is described. In contrast to other techniques involving the finite-element method, method in principle exact, can be implemented using low O(N) amounts of storage. This particular importance large-scale applications, a characteristic boundary chosen terminate mesh, usually as close structure possible. general description without reference any specific geometry or application,...

The discrete complex image method is extended to efficiently and accurately evaluate the Green's functions of multilayer media for moments analysis. difficulty associated with surface-wave extraction muitilayer solved by evaluating a contour integral recursively in k/sub p/-plane, With this scheme, works both near- far-field regions general media, whether open or shielded lossy lossless.