Compact Broadband Dual-polarized Antenna with Parasitic Patches

Abstract

In this paper, a broadband compact dual-polarized antenna for base stations is proposed.This antenna consists of a pair of crossed dipoles, four triangular parasitic patches, and a box reflector.The crossed dipoles are fed by two 50 Ω coaxial cables.The increase of four parasitic patches allows the resonant point to be generated at high frequencies to further widen the impedance bandwidth; the size of the parasitic patches is reduced to realize the reduction of the antenna radiator size; and the impedance matching is improved by cutting circular slots in the dipole arms.The measured results show that the proposed antenna is able to achieve a wide impedance bandwidth of 79% (1.67 to 3.87 GHz) with VSWR less than 1.6.A stable gain of 8-8.7 dBi and a half-power beamwidth (HPBW) of 60-78 • are obtained at 2.2-3.65 GHz.In addition, the antenna radiator is very compact in size, only about 0.41λ L × 0.41λ L × 0.17λ L , where λ L is the longest operating wavelength.