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A type of annular planar monopole antenna is presented. The impedance and radiation characteristics of the monopole with different holes and feed gaps are experimentally examined. The measured results demonstrate that the proposed antenna is capable of providing significantly broad impedance bandwidth with acceptable radiation performance.
Chen, Z., Ammann, M., Chia, W., See, T.: Annular planar monopole antennas. IEE Proceedings on Microwaves, Antennas and Propagation, Vol.149, pp.200-2003. August, 2002.