A Compact Tunable Internal Antenna for Personal Communication Handsets

This letter presents a compact tunable internal planar inverted-F antenna (PIFA) for personal communication handset applications. The antenna operates at following frequency bands: DCS, PCS, UMTS, WiBro, WiMax and/or WiBro phase 3, and WLAN. A single varactor diode is attached to the antenna in a proper location between the main patch and supplemental patch in order to get tuning over the wide frequency range around 2 GHz. The antenna was designed and optimized by using CST microwave studio program. Measured return losses $({\rm S}_{11})$ and radiation patterns of the antenna were carried on Anritsu 37377C Vector Network Analyzer and in standard anechoic chamber room. The surface current distributions, the co-polarization and cross- polarization patterns of the antenna are given to demonstrate the antenna's performance.