Small‐size wideband chip antenna for WWAN/LTE operation and close integration with nearby conducting elements in the mobile handset

A wideband chip antenna having a small size of 3 × 15 × 35 mm3 for application in the mobile handset to cover eight-band WWAN/LTE operation is presented. The antenna is mainly formed by a direct-feed two-branch strip and a coupled-fed shorted strip. The two-branch strip functions as an efficient radiator and also as a coupling feed to capacitively excite the shorted strip. The coupled-fed shorted strip contributes a wide resonant mode at about 800 MHz to cover the LTE700/GSM850/900 (704∼ 960 MHz) operation. The two-branch strip and the shorted strip together contribute their fundamental or higher-order resonant modes to cover the GSM1800/1900/UMTS/LTE2300/2500 (1710∼ 2690 MHz) operation. There are also ground planes located on two side surfaces of the chip antenna, which are grounded to the system ground plane printed on the main circuit board of the mobile handset. This configuration allows the antenna to be closely integrated with nearby conducting or electronic elements such as a universal series bus connector to achieve compact integration of the internal antenna in the mobile handset. Details of the proposed antenna are presented. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett, 2011; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26200