Analysis of integrated inverted-F antennas for Bluetooth applications

Abstract

An integrated planar inverted-F antenna (PIFA) is proposed and analyzed. The antenna is printed on the RF printed circuit board of a wireless communication device. Numerical analysis data shows that such an antenna can be utilized with as small as 22 mm by 5 mm by 1 mm of volume. The volume occupancy can be further reduced by adjusting various different antenna parameters. Such guidelines have also been presented. A laboratory prototype of such an antenna has been built and tested. Measured VSWR frequency data show that the antenna has adequate bandwidth within 2:1 VSWR for Bluetooth application. Radiation patterns have been measured in three orthogonal planes of the antenna using both dominant and cross polarizations. Test data demonstrated that the Bluetooth PIFA had comparable performance to a half-wave dipole.