A Compact Tunable Internal Antenna for Personal Communication Handsets

Abstract

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 (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.