Compact coupled-fed wideband antenna for internal eight-band LTE/WWAN tablet computer applications

Abstract

In this article, a compact coupled-fed antenna for eight-band LTE/WWAN tablet computer applications is proposed. The designed antenna consists of an L-shaped monopole, a long meandered strip, a long radiation strip, and a short shorted strip. The long meandered strip and long radiation strip can generate a dual-resonance characteristic for the antenna’s lower band, making it capable of a wideband operation to cover the desired LTE700/GSM850/900 (698–960 MHz) bands. Furthermore, the notch in the long radiation strip can also influence the bandwidth of the antenna’s lower band. The long radiation strip can generate an additional higher order resonant mode at the upper band, combining the two resonant modes contributed by the L-shaped monopole and the short shorted strip to form a wide upper band, covering GSM1800/1900/UMTS2100/LTE2300/2500 (1710–2690 MHz) bands. With the proposed scheme, the antenna only occupies a small volume of 60 12 4 mm3 and can mainly be disposed on a 0.8-mm thick FR4 substrate. The antenna is mounted at the top edge of the display ground which supports a 150 200 mm2 display for the tablet computer. Reasonably good radiating efficiency and antenna gain are also achieved for the practical tablet computer.