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A novel wideband tri-plate monopole antenna comprising three folded rectangular plates spaced by 120° and connected together at the antenna's central axis is presented. The antenna occupies a small cross-sectional area of 10 mm in diameter and yet provides a large bandwidth of >10 GHz (about 2.7–12.9 GHz here). In addition, the antenna shows improved omnidirectional radiation patterns across the passband.
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Wong et al. (2004) studied this question.
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