An Automatic Antenna Tuning System Using Only RF Signal Amplitudes

Firrao, E.L. and Annema, A.J. and Nauta, B. (2008) An Automatic Antenna Tuning System Using Only RF Signal Amplitudes. IEEE Transactions on Circuits and Systems II - Express Briefs, 55 (9). pp. 833-837. ISSN 1549-7747

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Abstract:	The operating environment of mobile phones fluctuates continuously, due to changing handling onditions and nearby objects. The resulting fluctuations in antenna impedance cause both a decrease in link quality and a higher standing wave ratio, that requires more robust and hence less efficient PA implementations. In this paper an automatic antenna tuner system for handheld applications is presented that uses two series reactances combined with 3 simple RF-peak detectors to sense both reactive and real impedance mismatches. The control loop only requires low-frequency electronics which makes it low cost,low power and relatively easy to integrate. Measurements on a demonstrator system show correct behaviour for VSWR up to 10.
Item Type:	Article
Copyright:	© 2008 IEEE
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Integrated Circuit Design (ICD)
Link to this item:	http://purl.utwente.nl/publications/65313
Official URL:	http://dx.doi.org/10.1109/TCSII.2008.925652
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