A new frequency reconflgurable unequal U-slot antenna is presented in this paper. The U-slot antenna loaded with two lumped variable varactors is capable of 6 difierent frequencies switching between 2.3GHz and 3.6GHz. The small slots in the ground plane are employed for the biasing circuit to minimize the parasitic efiects towards the performance of the antenna. It is found that the unequal U-slot fed by an L-shaped feed line can reduce 30% of the size of the conventional U-slot antenna. Moreover, the proposed antenna ofiers stable radiation characteristics for each operating frequency in the tunable range. The antenna ofiers a gain of 4.5dB in average. The designs are verifled through both numerical simulations and measurements of an experimental prototype. Details of the antenna designs and measured results are presented and discussed.
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Ren et al. (2013) studied this question.
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