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A novel coaxial-fed E-shaped microstrip patch antenna is proposed in this paper. The proposed antenna is found to have a much broader impedance bandwidth as compared to the conventional U-slot antenna. An impedance bandwidth of about 33.8% is achieved for the proposed E-plane antenna. Through the use of a washer on the proposed antenna, the probe inductor is compensated, and an impedance bandwidth of 40% is thus obtained. The E-plane radiation pattern for both the proposed antenna and the one incorporated with the washer remains relatively constant through the band. A comparison between the U-slot antenna and our proposed antennas is made in the paper.
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Ooi et al. (2000) studied this question.
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