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A closely-packed (4mm) diversity slot antennas operating in the UWB frequency is proposed. High isolation (S21 < i20dB) of two closely-packed slot antennas can be easily achieved in a broad band by taking advantage of the directional radiation characteristics of slot antenna. Quarter-wavelength slot resonator is adopted to improve the isolation in the low-band of the UWB. The simulated current distribution and the radiation patterns of the single antenna element with and without slots are also presented to explain the mechanism of decoupling in the diversity system. Furthermore, the diversity performance of correlation coe-cient, mean efiective gains (MEGs), diversity gain (DG) are also studied.
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Mao et al. (2013) studied this question.
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