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

Volume

56

Issue

4

fYear

2008

fDate

4/1/2008 12:00:00 AM

Firstpage

944

Lastpage

950

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);

fLanguage

English

Journal_Title

Antennas and Propagation, IEEE Transactions on

Publisher

ieee

ISSN

0018-926X

Type

jour

DOI

10.1109/TAP.2008.919200

Filename

4483597