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TitleDiversity gain from a single-port adaptive antenna using switched parasitic elements illustrated with a wire and monopole prototype
Publication TypeJournal Article
Year of Publication1999
AuthorsScott, N.L.
JournalIEEE Transactions on Antennas and Propagation
Pagination1066 - 1070
Date Published1999
ISSN0018926X (ISSN)
KeywordsDirectional patterns (antenna), Diversity gain, Electric impedance, Electric switches, Electromagnetic wave scattering, Phase shifters, Switched parasitic prototype, Wire monopole antennas
AbstractA new concept in single-port adaptive antennas using parasitic elements with switched terminating impedances is presented including results from a concept prototype. Each parasitic element can be effectively terminated in three impedance values. The antenna concept provides multiple radiation patterns with a single RF signal port without the need for RF switches or phase shifters in the direct RF signal path. Impedance variations in the active antenna element are minimized by use of only rotationally symmetric configurations. Measured patterns are used to demonstrate the performance improvement expected using switched diversity combining in a simulated uniform scattering scenario. The concept prototype having one active element and four parasitic elements, is shown to have equivalent diversity performance to between three and four uncorrelated branches.

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