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Two new configurations of circular wire mesh and annular ring monopole antennas have been investigated and the results are compared with the corresponding circular disc monopole antenna. For the wire mesh monopole antenna of diameter 26 cm with peripheral metal strip, the measured bandwidth for voltage standing wave ratio ≤ 2 has been obtained from 258 to 5240 MHz, which has a bandwidth ratio of 20.3:1. For annular ring monopole with outer diameter of 26 cm and inner diameter 14 cm, the measured band width for voltage standing wave ratio ≤ 2 has been obtained from 245 to 5275 MHz leading to 21.5:1 bandwidth ratio. These new configurations have less wind loading and weight as compared to circular disc monopole antenna.
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Ray et al. (2006) studied this question.
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