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A circular annular planar monopole with electromagnetic coupling shows broadband properties. The planar radiator is electromagnetically coupled with a probe-fed strip, and separated from it by a thin dielectric sheet. The parametric effects on the bandwidth are examined experimentally. The measurements demonstrate that the proposed monopoles have the merit of broad impedance bandwidths in the order of 100% for VSWR=2:1 and of 4:1 for VSWR=3:1 and acceptable radiation patterns across the bandwidths.
Chen, Z. Ammann, M., Chia, M., See, T.: Circular annular planar monopoles with EM coupling. IEE Proceedings Microwaves, Antennas and Propagation,8 August, 2003, Vol.150, pp. 269-273.