SMALL-SIZE 11-BAND LTE/WWAN/WLAN INTERNAL MOBILE PHONE ANTENNA

This work presents an internal mobile phone antenna occupying a small board space of 600 mm(2) on the system circuit board and providing three wide operating bands of at least 698-960, 1710-2690, and 5150-5825 MHz for the 11-band long term evolution (LTE)/wireless wide area network (WWAN)/wideband local area network (WEAN) operation. This includes three LTE hands of LTE700/2300/2500, five WWAN bands of GSM850/900/1800/1900/UMTS, and three WLAN 2.4/5.2/5.8 GHz bands. The antenna is a coupled-fed shorted monopole, with a wide feeding strip in the coupling feed, a long shorting strip closely coupled to the shorted monopole, and a tuning stub connected to the shorting strip. The antenna's three wide operating bands are achieved and controlled by tuning the width of the feeding strip, the gap between the shorting strip and the shorted monopole, and the dimensions of the tuning stub. Operating principle of the proposed antenna is described in detail in this article. Results of the fabricated antenna are presented and discussed. The specific absorption rate results of the antenna with the presence of the user's head and hand are also studied. (C) 2010 Wiley Periodicals, Inc. Microwave Opt Technol Lett 52:2603-2608, 2010; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.25526