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A crossed-dipole antenna providing polarization diversity is presented. The antenna which employs a planar reflector yields high directivity and good isolation between ports over a wide impedance bandwidth, suitable for polarization-agile wireless base-station use. The dipole wing shape is optimised, which yields the wide bandwidth. Matching is achieved using a quarter-wave balanced-to-unbalanced section which also improves the port-to-port isolation. Radiation characteristics for linear and circular polarizations are presented
Lerma, F. John, M., Ruvio, G., Ammann, M., Herscovici, N.: Wideband directional base-station antenna with dual-linear and circular-polarization capabilities. Irish Signals and Systems Conference, pp.253-256. Dublin, 28-30 June, 2006.