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An ultra-wideband (UWB) antenna is designed for communications applications. Parameters that affect the antenna performance are investigated using both simulations and measurements. The same antenna is redesigned for use in a UWB cancer detection system, and its performance characteristics are investigated in a lossy biological coupling medium
We propose a novel near-field approach to microwave non-destructive detection and evaluation of defects. The problem is expressed as an inverse least square problem solved using a gradient-based optimizer. The required response gradient is obtained with an adjoint-based sensitivity analysis technique developed here to handle materials with complex permittivity. It allows the recovery of the shape...
Forward electromagnetic (EM) solutions must be sufficiently accurate in order to be used in the solution of the inverse problem of microwave medical imaging. Two well-known issues related to the adequacy of the forward EM solutions are: 1) the feasibility of 2-D approximations and 2) the effect of the skin interface. In this paper, we present a systematic study using the time-domain EM solver XFDTD...
Recently, a self-adjoint method was proposed for the computation of network parameter sensitivities. Here, we propose a modification to this method, which practically eliminates its overhead by using the Broyden update for the computation of the system matrix derivatives. We investigate the feasibility and the efficiency of the Broyden-update self-adjoint sensitivities in gradient based optimization...
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