Low profile octa-band antenna without lumped elements for WWAN/LTE metallic narrow-frame tablet computers

摘要

A low profile octa-band antenna with a small size of 74 x 5 x 0.8 mm(3) for the WWAN/LTE metallic narrow-frame tablet computer is proposed. The antenna consists of a driven strip and a ground strip. A gap of 2.5 mm in width is disposed at the top of metallic frame, and a T-shaped open slot is formed by the ground clearance and the metallic frame. As a result, additional slot resonant modes can be excited, and the operating bandwidth of the antenna is widened. With only 5 mm ground clearance, the antenna successfully covers all WWAN/LTE bands without any lumped elements. The antenna is fabricated. The measured results show that the antenna operates in 698-960 and 1710-2690 MHz bands with good radiation efficiencies. The proposed antenna is suitable for the metallic narrow-frame tablet computer applications.