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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...
A new heuristic approach is presented to find the optimal topologies of structures with tension/compression-only materials. In civil engineering, the structures, such as brick walls have only compressive stiffness, or as the cable-membrane structures can only against tension loadings. To find their optimal topologies with traditional continuum topology optimization methods are very hard. Two reasons...
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