Abstract
By embedding four radial slots in ground plane, enhanced performances of a probe-fed annular-ring patch antenna operated at the TM/sub 21/ mode for conical-pattem radiation have been obtained. The size reduction achieved for the proposed antenna is about 75%, compared with the corresponding conventional annular-ring patch antenna at a fixed operating frequency. Moreover, with the large lowering in the resonant frequency, the impedance bandwidth of the proposed antenna can greatly be increased by a factor of about 4.8. Also, the antenna gain measured is increased by about 3 dBi. Owing to these enhanced performances, the proposed antenna is suitable for present-day mobile communication. In addition, the design of adding a reflecting plate behind the antenna's ground plane to reduce the backward radiation due to the embedded slots in the ground plane is also studied.
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