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Electromagnetic problems with both conducting and dielectric media are formulated through volume-surface integral equations (VSIEs) in integral equation approach. The conducting part is described by surface integral equation while the dielectric part is governed by volume integral equations (VIEs) and they are coupled together by produced fields. The VSIEs are usually solved by the method of moments...
Electromagnetic modeling and simulation is performed for a miniaturized patch antenna which includes a lossy dielectric substrate and layered thin-ferrite-film superstrate above microstrip. The structure is of multiscale and multimaterial feature and the system matrix may not be well-conditioned if surface integral equations (SIEs) are used to describe the problem. This work formulates the problem...
Accurate electromagnetic (EM) analysis is performed for transmission line structures with finite-thickness conductors. Traditionally, the analysis ignores the thickness of conductors to simplify the model but such an ignorance may not be allowed in many applications. In this paper, a rigorous three-dimensional (3D) model without any geometric approximation is established and the method of moment (MoM)...
Accurate solution of electromagnetic (EM) problems with complex materials requires the formulation of volume integral equations (VIEs) in the integral equation approach. The VIEs are traditionally solved by the method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function, but we propose a point-matching scheme which does not relies on any basis and testing functions and allows the...
The interaction of transient electromagnetic (EM) wave with objects can be formulated by the integral equation approach in time domain. For conducting objects or homogeneous penetrable objects, the time-domain surface integral equations (TDSIEs) can be applied. Traditionally, the TDSIEs are solved by the method of moments (MoM) in spatial domain and a march-on in time (MOT) scheme in temporal domain...
Lossy conductors are not perfectly electric conductors and their finite conductivity needs to be carefully accounted for in the accurate solution of electromagnetic problems. Traditionally, surface integral equations (SIEs) are used to approximately describe the problems, but we use volume integral equations (VIEs) to exactly formulate the problems by treating the lossy conductors as dielectric-like...
Tunability analysis based on electromagnetic modeling and simulation is performed for a miniaturized patch antenna loaded with self-biased magnetic films. The antenna includes a lossy dielectric substrate and layered thin-ferrite-film superstrate above microstrip. The structure is of multiscale and multimaterial feature and the system matrix may not be well-conditioned if the problem is described...
Accurate electromagnetic (EM) analysis for interconnect structures requires to consider the finite conductivity of involved conductors. The conductor loss could be accounted for through an approximate surface impedance when the skin depth of current is small. However, this approximation may not be valid for large skin depth caused by low frequencies or small conductivities. In this work, we treat...
The electromagnetic (EM) problems with conductive objects can be solved by surface integral equations (SIEs) with the method of moments (MoM) discretization in the integral equation approach. However, the solutions may not be valid for a wide range of frequency and conductivity. In this work, we use the volume integral equations (VIEs) to formulate the problem and propose a point-matching scheme to...
Volume integral equations (VIEs) are usually solved by the method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function. The SWG basis function requires conformal meshes in geometric discretization and may be inconvenient for inhomogeneous problems. In this work, we propose a point-matching method for solving the VIEs without using any basis function. The method can allow an inhomogeneity...
Electromagnetic (EM) radiation can be produced by mechanical excitation for certain elastic materials like piezoelectric material. The problem involves both electrodynamic and elastodynamic processes and the coupled Maxwell's equations and elastic wave equations are generally solved in their partial differential equation (PDE) form. In this work, we develop an integral equation approach for solving...
Reconstructing unknown dielectric objects by integral equation approach requires an efficient solution of volume integral equations (VIEs) and the widely-used method of moments (MoM) with the Schaubert-Wilton-Glisson (SWG) basis function may not be appropriate in such a scenario due to the unknown profile of objects in the imaging domain. In this work, we develop a meshless scheme for solving the...
The reference antenna concept has been created to eliminate the uncertainties linked to the unknown antenna performances of the LTE 2×2 MIMO reference devices [1]. The wireless industry through the CTIA (The Wireless Association) and 3GPP (3G Partnership Project) standardization bodies has been using such antennas for characterizing the methodologies being proposed for the MIMO OTA tests [2]. The...
an integral equation approach based on domain decomposition method (DDM) is presented to solve antennas problems on electrically large platform. This proposed approach combines equivalence principle algorithm (EPA) and physical optics (PO). The number of unknowns decreases and computational efficiency increases. More importantly, EPA-PO avoids iterative Multi-Region procedure and obtains the final...
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