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, ultra-wideband antennas (UWB), directivity, Vivaldi antenna, microwave sensing.
IdentifiersURN: urn:nbn:se:umu:diva-102572DOI: 10.1109/TAP.2015.2449894OAI: oai:DiVA.org:umu-102572DiVA: diva2:808369
Originally published in thesis in manuscript form.2015-04-282015-04-282015-09-08Bibliographically approved