A Wideband Dual-Polarized Antenna Using Shorted Dipoles

Abstract

A novel design method of a wideband dual-polarized antenna is presented by using shorted dipoles, integrated baluns, and crossed feed lines. Simulation and equivalent circuit analysis of the antenna are given. To validate the design method, an antenna prototype is designed, optimized, fabricated, and measured. Measured results verify that the proposed antenna has an impedance bandwidth of 74.5% (from 1.69 to 3.7 GHz) for VSWR <; 1.5 at both ports, and the isolation between the two ports is over 30 dB. Stable gain of 8-8.7 dBi and half-power beamwidth (HPBW) of 65°-70° are obtained for 2G/3G/4G base station frequency bands (1.7-2.7 GHz). Compared to the other reported dual-polarized dipole antennas, the presented antenna achieves wide impedance bandwidth, high port isolation, stable antenna gain, and HPBW with a simple structure and compact size.

Keywords

• Balun
• base station
• dual-polarized antenna
• shorted dipoles
• wideband antenna