A novel design of a microstrip-line-fed printed semicircular slot antenna is proposed. A prototype of the proposed antenna is also constructed and experimentally studied. Results show that, by protruding a small rectangular slot of proper dimensions along the direction of the microstrip feed line, good impedance matching over a wide operating bandwidth for the proposed antenna can be obtained. The constructed prototype shows an operating bandwidth, determined by the 10 dB return loss, of about 46%, which is about three times that of a corresponding conventional printed wide rectangular slot antenna. Details of the proposed antenna and obtained experimental results are presented.
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Chen et al. (2000) studied this question.
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