Reduction of Specific Absorption Rate in Multiband Antenna for Mobile Applications

Technology has grown to its peak and mobile phone plays the major role in todays life. Antenna is an important device used for communication in mobile phone. Multiple antennas are used in mobile phones for each application and also the specific absorption rate (SAR) is high in these antennas that affect the human brain. The FCC limits for public exposure from cellular telephones is the SAR level of 1.6 watts/kilogram. To decrease the number of antennas in mobile phone and to reduce the SAR in the mobile phones, in this work a PIFA with Spiral slot and DGS is designed. The antenna design, simulation and the SAR calculation is done in HFSS. PIFA structure reduces the backward radiation thereby reducing the SAR value. The antenna operates in multiband (GSM 1800, UMTS) and also due to PIFA structure the SAR rate of the antenna is reduced to 1.1 watts per kilogram that meets the FCC requirement.