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In this paper, a novel dual band frequency tunable slot antenna using varactors is presented. By varying the bias voltage of the varactors, the length of the slot is tuned equivalently, thus both the lower resonant frequency and the higher resonant frequency can be tuned simultaneously with a constant frequency of f2/f1. The first resonant frequency can be tuned from 1.36 GHz to 1.52 GHz while the...
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