Design of broadband dual‐polarized planar antenna with triple radiators

Abstract

Abstract A wideband dual‐polarized planar antenna with triple radiators is proposed for the LTE600/LTE700/GSM850/GSM900 base station in this paper. A novel concept of multi‐radiator for multi‐resonance by close coupling feed is presented and analysed . The proposed antenna is mainly composed of two pairs of loop dipole, L‐shaped radiator, step dipole, two L‐shaped feed lines, balun and reflector. The reflector is designed with a centrosymmetric partible baffle for directional radiations, which contribute to stable radiations as well. Owing to the novel closely coupling scheme for multi‐radiators, three resonances are simultaneously excited within the desired band, producing a wide bandwidth of 47.7% (from 0.59 to 0.96 GHz) for |S11| < −15 dB with high isolation more than 30 dB. Moreover, an average gain of 8.8 dBi as well as stable radiation patterns are achieved simultaneously.