Title :
A Frequency Tuning Method for a Planar Inverted-F Antenna
Author :
Komulainen, Mikko ; Berg, Markus ; Jantunen, Heli ; Salonen, Erkki T. ; Free, Charles
Author_Institution :
Univ. of Oulu, Oulu
fDate :
4/1/2008 12:00:00 AM
Abstract :
A novel method is presented for electrically tuning the frequency of a planar inverted-F antenna (PIFA). A tuning circuit, comprising an RF switch and discrete passive components, has been completely integrated into the antenna element, which is thus free of dc wires. The proposed tuning method has been demonstrated with a dual-band PIFA capable of operating in four frequency bands. The antenna covers the GSM850, GSM900, GSM1800, PCS1900 and UMTS frequency ranges with over 40% total efficiency. The impact of the tuning circuit on the antenna´s efficiency and radiation pattern have been experimentally studied through comparison with the performance of a reference antenna not incorporating the tuning circuit. The proposed frequency tuning concept can be extended to more complex PIFA structures as well as other types of antennas to give enhanced electrical performance.
Keywords :
antenna radiation patterns; multifrequency antennas; planar inverted-F antennas; tuning; RF switch; discrete passive component; frequency tuning method; planar inverted-F antenna; radiation pattern; 3G mobile communication; Antenna accessories; Antenna radiation patterns; Circuit optimization; Dual band; Radio frequency; Switches; Switching circuits; Tuning; Wires; Frequency tuning; RF switches; mobile antennas; planar inverted-F antenna (PIFA);
Journal_Title :
Antennas and Propagation, IEEE Transactions on
DOI :
10.1109/TAP.2008.919200