Frequency-Agile Antennas for a Software-Defined and Cognitive Radio

James Aberle, S. H. Oh, G. A. Taylor

Research output: Chapter in Book/Report/Conference proceedingChapter


In this chapter a thorough investigation into the development of frequency agile antennas for a software-defined and cognitive radio has been presented. In particular, attention has been focused on a number of practical issues concerning the design and modelling of electrically small antennas, as well as their tunable matching networks and concomitant control circuitry and algorithms. A new theoretical tool was presented for characterizing antennas from a system point of view, allowing their frequency selectivity to be incorporated into the RF front-end design. Tunable matching networks were also presented as well as appropriate analog and mixed-signal control circuitry to allow frequency-agile antennas to be reconfigured on demand by the radio's baseband processor. Finally, the implementation of an AATU prototype was discussed.

Original languageEnglish (US)
Title of host publicationPrinted Antennas for Wireless Communications
Number of pages27
ISBN (Print)9780470512241, 9780470510698
StatePublished - Nov 5 2007


  • Antenna control unit
  • Automatic antenna tuning unit
  • Closed-loop automatic antenna tuning unit
  • Impedance synthesizer
  • Matchable impedance domain
  • Multiband and multimode radios
  • Open-loop and closed-loop algorithms
  • Software-defined radio
  • Tunable matching network
  • Two-port antenna model

ASJC Scopus subject areas

  • Engineering(all)


Dive into the research topics of 'Frequency-Agile Antennas for a Software-Defined and Cognitive Radio'. Together they form a unique fingerprint.

Cite this