Dual-wideband single open-slot antenna for LTE/WWAN smartphone

A simple narrow open-slot antenna design is proposed for smartphone applications. It is constructed by a vertical feedline with two horizontally protruded feeding structures for achieving long term evolution (LTE)/wireless wide area network (WWAN) dual-band operation. To further excite an additional slot mode in the lower operating band, a series capacitor is loaded into one of the protruded feeding structures. For improving the impedance matching for the operating dual-bands, an L-shaped metallic plate attached to the top edge of the ground plane is also applied. Detail configuration and design of the proposed antenna is presented. The simulated and measured return loss is also addressed. From the measured results, good antenna efficiencies of more than 40% are demonstrated across the LTE/WWAN operation in the 698-960 MHz and 1710-2690 MHz bands.