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In order to overcome the shortcoming of narrow bandwidth of conventional PIFA, a novel bandwidth enhancement approach is proposed in this paper. A handset antenna technique that combines a parallel excitation of PIFA and slot radiators is presented. To improve the bandwidth of handset antennas in both low and high bands, slots can be introduced into the radiating patch of different shapes such as rectangular and Hshape. Comparison between the PIFA with U-slot on the radiating patch of these shapes can provide that which shape is suitable for enhanced antenna performance.
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