Small-size LTE/WWAN planar printed antenna for ultrathin smartphone application

A compact small-size LTE/WWAN planar printed antenna for ultrathin smartphone application is presented, which achieves two wide operating bands of 647-972 MHz and 1605-2770 MHz to cover LTE (LTE700/2300/2500) and WWAN (GSM850/900/1800/1900/UMTS2100) bands. A feeding strip and an inverted M-shaped parasitic shorting strip are combined to form the proposed coupled-fed antenna with a simple structure and small size of 15 x 36 mm(2). So it can be easily printed on the circuit board and it is convenient to adjust antenna performance. At the same time, a rectangular notch on the circuit board not only can be used to place the battery for ultrathin smartphone application but also changes the ground plane current path to achieve a better impedance matching, especially in the low-band (698-960 MHz). Moreover, the proposed antenna allows tighter integration of multiple electronic components, such as USB, microphone. In addition, the design process and measured results of the proposed antenna are also provided below. (c) 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2116-2120, 2015