Low‐profile multibranch monopole antenna with integrated matching circuit for Lte/Wwan/Wlan operation in the tablet computer

A low profile, small-size, planar tablet computer antenna for the long-term evolution (LTE)/wireless wide area network and 2.4-GHz WLAN operation is presented. The antenna is formed by three monopole strips configured into a compact configuration and printed on a thin FR4 substrate of size 10 × 40 mm2. A high-pass matching circuit is integrated thereon, without increasing the antenna size, to greatly enhance the antenna's low-band bandwidth to cover the LTE700/GSM850/900 operation (704–960 MHz) with a low-antenna profile of 10 mm. The antenna's higher band is formed by two wide resonant modes contributed by the monopole strips and can cover the GSM1800/1900/UMTS/LTE2300/2500 operation (1710–2170/2300–2400/2500–2690 MHz). In addition, one of the resonant modes in the higher band can be adjusted to occur at about 2.4 GHz such that enhanced radiation characteristics for frequencies in the 2400–2484-MHz WLAN band are obtained for the proposed antenna. © 2014 Wiley Periodicals, Inc. Microwave Opt Technol Lett 56:1662–1666, 2014