Broadband dual-polarized antenna with parasitic elements for base-station applications

Abstract A broadband ±45° dual-polarized base-station antenna based on crossed-dipoles with parasitic elements has been presented in this study. This antenna consists of printed dipoles fed by integrated baluns, parasitic elements, and a ground plane below them. As a result of using parasitic elements on the dipoles and creating a suitable coupling between them, the antenna’s impedance bandwidth has been improved, and its dimensions have been reduced. The experimental results show that the proposed antenna can cover the frequency band of 1.58–2.73 GHz with | S 11 | < −15 dB and isolation better than 17 dB. The measured peak gain for the proposed antenna in the frequency band is reported as 7.8 dB. Also, the antenna’s half-power beamwidth equals 62.15° ± 1.45°. The proposed antenna is fabricated with overall dimensions of 0.67λ 0 × 0.67λ 0 × 0.17λ 0 and has been measured in the antenna laboratory.