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Two kinds of band-notched ultra wide-band slot antennas are proposed.Printed on a dielectric substrate of FR4 with relative permittivity of 4.4 and fed by a 50 Ω microstrip line, the proposed antennas introduce semicircular annular strips to reject the frequency band (5.15-5.85GHz) limited by IEEE802.11a.The parameters which affect the performance of the antennas in terms of its frequency domain characteristics are investigated in this paper.
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Zhang et al. (2007) studied this question.
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