Multiband Hybrid Loop/Monopole Slot/Planar Monopole Antenna for Mobile Phone Application

In this paper, a novel planar hybrid multiband antenna formed by a loop-type antenna, a monopole slot antenna, and a coupled planar monopole antenna for the mobile phone is proposed. The loop-type antenna comprises a driven monopole and a coupled strip that printed on the other side of the substrate and short-circuited to the ground. The 0.5? and 1.0? mode of the loop-type antenna are excited. Therefore, the 0.5? mode of the loop-type antenna forms a wide bandwidth of 326 MHz to cover the GSM850/900 operation and the 0.25? mode of the monopole slot antenna, the 1.0? mode of the loop-type antenna, and the 0.25? mode of the coupled monopole antenna provide a wide bandwidth of 1181 MHz to cover the GPS/DCS/PCS/UMTS/WLAN2.4/WiMAX operation. Finally, the 0.5? mode of the coupled monopole antenna forms a wide bandwidth to cover the WLAN5.2 operation. Moreover, the hybrid antenna occupies a compact area of 16.5 × 45 mm2 and it has good radiation characteristics over the operating bands.