Adaptive matching circuitry for compensation of finger effect on handset antennas

In this paper we present and evaluate the effect of hand on terminal antenna and discuss a method to compensate for the mismatch. A dual band PIFA was used in this study. The presence of the hand was observed to cause 2-6 dB loss in efficiency in low-band and 2-4 dB loss in highband. In this study we propose a dynamic antenna matching (DAM) technique to improve matching level that can improve the total efficiency of the antenna by 2 - 4 dB compared to the mismatched case.