Design of dual-polarized antenna used for MIMO base station and analysis of array element mutual coupling

An H-type slot antenna is designed by using slot-couple technology and two-gap-couple feed technology.It is structure-simple,easy to produce and low cost.With such features as high-gain,high isolation and dual-polarized,it is fit for MIMO mobile communication base station.It is simulated and tested.The tested data coincide well with the simulation results.In frequency band from 2.11 GHz to 2.17 GHz,the horizontal polarization gain is 9.2 dBi,the vertical polarization gain is 9.17 dBi and the port isolation is lower than-40 dB.The mutual coupling between the array elements of MIMO systems is analyzed.The smallest elements spacing d=0.86λ for the base station antenna array is given by the simulation which provides reference data for the correlation analysis of MIMO system.