F09(5) Topology optimization for electromagnetic wave propagation problems

野村, 壮史; 佐藤, 和夫; 西脇, 眞二; 吉村, 允孝

doi:10.1299/jsmemecjsm.2007.8.0_228

Cited by 1 publication

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“…The response-derivative calculation uses a self-adjoint sensitivity formula. Response sensitivity analysis has been widely used in computer-aided design [25][26][27][28][29][30] and inverseproblem solutions [22,[31][32][33][34]. It provides the Jacobian matrix (response gradients, response sensitivities) from which the gradient of the objective function p is computed.…”

Section: Introductionmentioning

confidence: 99%

Near-field detection at microwave frequencies based on self-adjoint response sensitivity analysis

2010

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A new detection method is proposed for the localization of electrically small scatterers in a known background medium. The method requires the knowledge of the electric field distribution inside the known background medium where no scatterers are present. It is based on a self-adjoint response sensitivity computation which can be performed in real time. Using the E-field distribution in the background medium, it provides three-dimensional maps of the Fréchet derivative within the imaged volume. The peaks and dips in these maps identify the locations where the permittivity and conductivity of the measured medium differ from those in the background medium. The background medium can be heterogeneous. In a homogeneous-medium example, the performance of the detection algorithm is studied in terms of the number of transmission/reception points, the dielectric contrast of the scatterer compared to the background medium, and the size of the scatterer. Its resolution is also addressed. The detection of a small scatterer in a heterogeneous background is demonstrated.

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