Oh S.-H. Automatically tuning antenna system for software-defined and cognitive radio

A Dissertation presented in partial fulfillment of the requirements for the degree Doctor of Philosophy. Arizona State University, 2006. – 140 pages.
This dissertation discusses the approach and benefits of implementing an automatic antenna tuning unit (ATU) for the further development of software defined and cognitive radio. The focus of the topic of this dissertation is to simplify radio frequency (RF) front-end design for unit-band, multi-mode radios by using reconfigurable antennas as a frequency-agile selective component and develop appropriate analog and mixed-signal control circuitry as well as algorithms to allow these antennas to be reconfigured in demand by the radio’s baseband processor.