SAR reduced antenna solution for tablet application

A novel SAR (specific absorption rate) reduced solution for tablet application is presented in this paper. The proposed antenna is constructed an IFA (inverted-F antenna) with a shorted loop structure and easy realized for tablet device applications. The antenna radiators are printed on a single layer FR4 substrate with small size of 51.2 × 8.2 × 0.4 mm³ and fed by a RF coaxial cable with I-PEX connector. The proposed antenna can support triplet-bands (850/1900/2100) of WWAN communication system that covers 824~894 MHz, 1850~1990 MHz and 1920~2170 MHz and operate with minimum 40% radiation efficiency across these bands. The active performance TRP are measured about 28.5 dBm and 27.5 dBm in GRPS 850/1900 channels respectively, and about 19.5 and 21.5 dBm in both WCDMA band II and band V. The SAR performance of tablet back and tip side that we measured are less than 1.3 mW/g in low and high band which can meet FCC SAR limitation within 1.6 mW/g. All simulation data are simulated by SEMCAD EM software tool [1] and SAR test results are measured by DASY5 SAR equipment.