Ultra-Wideband Dual-Polarized Base-Station Antenna With Stable Radiation Pattern

This communication presents an ultrawideband dual-polarized antenna consisting of a main radiator, parasitic elements, and a ground plane. The main radiator is composed of two pairs of dual dipoles, which are cross-arranged and fed by coplanar-strip lines in order to achieve
$\pm \mathrm{45}^{\circ }$
dual-polarization within a wide frequency band. Parasitic elements, including a circular patch and four pairs of dipole strips, are employed for improving the radiation performance in high frequencies, which is very essential for stabilizing the radiation pattern over the entire bandwidth. The proposed antenna can cover the frequency range from 1.7 to 5.1 GHz for both polarizations, corresponding to an ultrawide bandwidth of 100%. The gain and half-power beamwidth (HPBW) are very stable within the entire bandwidth, which are
$8.2~\pm ~0.7$
dBi and
$\mathrm{65}^{\circ }\pm \mathrm{5}^{\circ }$
, respectively. The measured results agree well with simulated ones, indicating that the proposed antenna is a very promising candidate for the future base-station communication system.