A Broadband $\pm 45^{\circ}$ Dual-Polarized Antenna With Y-Shaped Feeding Lines

A broadband ±45^° dual-polarized base station antenna is proposed for 2G/3G/LTE bands. The proposed antenna has Y-shaped feeding lines to impart a wide impedance bandwidth to it, and a rectangular box-shaped reflector to enhance its stability in radiation patterns over the operating frequencies. A prototype of the proposed antenna is designed, fabricated, and tested. The measured results show achievement of impedance bandwidth of 45% for at both ports, port-to-port isolation 25 dB , a stable radiation pattern with 3-dB beamwidth 68^°±2^° at H-plane and V-plane, and a stable antenna gain of 8.2 ± 0.6 dBi from 1.7 to 2.7 GHz. A broadband dual-polarized antenna array with five elements for the band is developed for base station application. Measurements show achievement of array gain of 14.8 ± 1.4 dBi, 3-dB beamwidth 66.56^°±2.22^° at H-plane at port 1 and 64.85^°±4.96^° at port 2 with over the operating frequency band. Simulation results have a good agreement with measurement ones.