This paper proposes novel method to widen bandwidth of a slot antenna for mobile handset. The proposed method is adding rectangular loop and high dielectric material to a simple slot antenna for controlling resonances. Fundamental and two harmonic resonances can be converged within operation bands because the proposed method provides non-uniform resonance shifts. The bandwidth remarkably enhances from 320 MHz (1900-2220 MHz) to 880 MHz (1750-2630 MHz) by using the proposed method.
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