A Compact Multiband Inverted-F Antenna for LTE/WWAN/GPS/WiMAX/WLAN Operations in the Laptop Computer

An inverted-F antenna with multiband operations for Long-Term Evolution (LTE700/2300/2500), wireless wide area network (WWAN), GPS, WiMAX (2.3/2.5/3.5 GHz), and WLAN (2.4 GHz) applications is presented. The antenna consists of multibranch strips and is fabricated on both sides of an Al
$_{2}{\hbox{O}}_{3}$
ceramic substrate, which has a compact size of
$97\,({L})\times 11.2\,({ W})\times 0.5\,({ T})\ {\hbox{mm}}^{3}$
to be embedded inside the laptop computer as an internal antenna. Four operating bands covering 646–983, 1503–1589, 1696–2963, and 3396–3646 MHz for the LTE, WWAN, GPS, WiMAX (2.3/2.5/3.5 GHz) and WLAN (2.4 GHz) systems are achieved with good radiation efficiencies.