Title :
Automatic antenna tuning unit for software-defined and cognitive radio
Author :
Song, H. ; Oh, S.-H. ; Aberle, J.T. ; Bakkaloglu, B. ; Chakrabarti, C.
Author_Institution :
Arizona State Univ., Tempe
Abstract :
In this paper, we propose a new architecture for a closed-loop controlled antenna tuning unit (ATU) system (only transmitting path is shown). In contrast to previous work, no analog-to-digital converters (ADCs) are used. Using the ATU, the narrow instantaneous bandwidth of an electrically small antenna (ESA) is automatically tuned over a much wider frequency range by the ATU. This matching scheme ensures that the narrowband antenna is automatically matched to any desired frequency under all environmental conditions using circuits with practical component values and tolerances. It is imperative that the entire tuning process be completed rapidly using efficient algorithms and fast hardware, and for these algorithms and hardware to consume as little power as possible.
Keywords :
antennas; cognitive radio; software radio; tuning; automatic antenna tuning unit; closed-loop controlled antenna tuning unit system; cognitive radio; electrically small antenna; matching scheme; narrowband antenna; software-defined radio; tuning process; Analog-digital conversion; Automatic control; Bandwidth; Cognitive radio; Control systems; Frequency; Hardware; Narrowband; Transmitting antennas; Tuning;
Conference_Titel :
Antennas and Propagation Society International Symposium, 2007 IEEE
Conference_Location :
Honolulu, HI
Print_ISBN :
978-1-4244-0877-1
Electronic_ISBN :
978-1-4244-0878-8
DOI :
10.1109/APS.2007.4395436