Low-SAR hexa-band antenna for mobile applications

In this work, we describe a hexa-band mobile phone antenna with a metallic backing, designed for SAR reduction. The proposed antenna has a simple structure comprising of two radiating strips and a coupling strip which serves to enhance the bandwidth at high frequency. The antenna has been designed to cover multiple bands, namely LTE Band 13 (747-787 MHz); DCS 1800 (1710-1880MHz); PCS 1900 (1850-1990MHz); WCDMA (1920-2170MHz); LTE Band 40 (2300-2400 MHz); and Band 41 (2496-2690MHz). The designed antenna only occupies a small area of 15×29.5 mm² on the system circuit board. By adjusting the shape, location and size of the backing, the SAR is effectively reduced over all of the bands, while the efficiency of the antenna is preserved. Thus, the antenna is an excellent candidate for incorporation into smart phones for next generation wireless systems.