The Planar Coupled-Fed Multiband Antenna for Mobile Handset Application

The planar multiband monopole antenna with a coupled shorted strip and a main antenna suited to smart phone applications is proposed in the paper. The antenna occupies 52.5×15 mm² and printed on a single layer 0.8mm-thick FR4 substrate. By properly designing the dimensions of the antenna and tuning a coupling gap, it can be excited successfully multiple resonances covering our desired frequency bands. The measured results show that the antenna with enough impedance bandwidths ranged from 684-1142 MHz and 1618-2935 MHz, based on 6 dB return loss. In addition, the antenna has good radiation properties including nearly onmi-directional radiation patterns in the horizontal planes, efficiencies varied from 54 - 95% and gains from 1 - 4.2 dBi, respectively. Thus, it can fully covers ten-bands LTE-700/2300/2500, GSM-850/900, DCS-1800, PCS-1900, UMTS-2000, WiMAX-2300, WLAN-2400. It is suitable for smart handset applications.