Topology Optimization of Planar Antennas for Wideband Near-Field Coupling
Emadeldeen Hassan, Daniel Noreland, Robin Augustine,
Eddie Wadbro, Martin Berggren
Adjoint-field problem, directivity, microwave sensing,
ultra-wideband (UWB) antennas, Vivaldi antenna
We present an approach to design from scratch planar microwave antennas for the purpose of ultra-wideband (UWB) near-field sensing. Up to about 120 000 design variables associated with square grids on planar substrates are subject to design, and a numerical optimization
algorithm decides, after around 200 iterations, for each edge in the grid whether it should consist of metal or a dielectric. The antenna layouts produced with this approach show UWB impedance matching properties and near-field coupling coefficients that are flat over a much wider frequency range than a standard UWB antenna. The properties of the optimized antennas are successfully cross-verified with a commercial software and, for one of the designs, also validated xperimentally. We demonstrate that an antenna optimized in this way shows a high sensitivity when used for near-field detection of a phantom with dielectric properties representative of muscle tissue.
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