Circuit-defined dual-wideband antenna for LTE tablet device

Small-size circuit-defined tablet device antennas for LTE dual-wideband operation are presented. Two cases with dual-feed and single-feed designs are discussed. For the dual-feed design, the antenna is formed by a simple folded metal plate excited by a low-band feed (direct feed with matching network) and a high-band feed (gap-coupled feed with matching network) for LTE operation in the 698~960 and 1710~2690 MHz bands. The dual-feed antenna occupies a small size and can be disposed in a clearance area of 10 × 30 mm² (300 mm²) above the top edge of the device ground plane. The dual-wideband operation is controlled the two hybrid feeds with matching networks. The single-feed design shows a simplified matching network than the dual-feed design, with similar operating bands obtained. Details of the proposed antennas and their operating principle are presented.