New Compact Triple-Band Antenna for Mobile Handsets

The antennas must work in several bands in multi-band systems, and the size must be compact enough. Based on it, a new compact triple-band (GSM/DCS/ISM) planar inverted-F antenna(PIFA) was presented and a prototype was constructed and studied. The S_(11) parameters were measured, and the bandwidths are 3.4%, 10.3%, and 2.1% for corresponding band, respectively. For real use, the presence of the plastic case and the hand were considered, and the resulting data of the influence were measured and discussed. The radiation patterns and gains in free space were also measured, which show that this type of PIFA is suitable for multi-band mobile communication applications.