Topology Optimization of Planar Antennas for Wideband Near-Field Coupling
2015 (English)In: IEEE Transactions on Antennas and Propagation, ISSN 0018-926X, E-ISSN 0096-1973, Vol. 63, no 9, 4208-4213 p.Article in journal (Refereed) Published
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 experimentally. 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.
Place, publisher, year, edition, pages
2015. Vol. 63, no 9, 4208-4213 p.
Adjoint-field problem, directivity, microwave sensing, ultra-wideband (UWB) antennas, Vivaldi antenna
IdentifiersURN: urn:nbn:se:uu:diva-263444DOI: 10.1109/TAP.2015.2449894ISI: 000360803400050OAI: oai:DiVA.org:uu-263444DiVA: diva2:859308
FunderSwedish Research Council, 621-2013-3706Swedish Foundation for Strategic Research , AM13-0029