In this letter, a dual-band parasitic radiator is designed and optimized to modify the current distribution on the
ground plane of a handheld terminal. Using a variable-length dual-band parasitic radiator, the ground current distribution is
controlled, and low specific absorption rate (SAR) and high radiation efficiency at 900 and 1880 MHz are obtained. The proposed
antenna scheme consisting of a dual-band parasitic element and a driven dual-band antenna reduces the peak SAR by 50% and 40% at 900 and 1880 MHz, respectively, compared to a conventional
dual-band antenna. Significant increase in radiation efficiency is also obtained.
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