MIMO Antenna Characterization in Realistic Propagation Scenario: Use of Infinitesimal Dipole Models with Cross-correlation Green's Functions

This paper focuses on envelope correlation coefficient (ECC) computation of MIMO antennas operating in realistic indoor/outdoor propagation scenario, based on an integrated scheme of infinitesimal dipole modelling (IDM) and modified Cross-correlation Green's functions (CGF). By using inbuilt field calculators and IDM principle, the radiating currents of MIMO antennas modelled in commercial full-wave solvers (eg. Ansys HFSS) can be estimated effectively. The modified CGFs further embed the effects of statistical propagation parameters directly into the electromagnetic considerations. This facilitates the ECC calculation directly from the sampled radiating currents, bypassing the conventional tedious complex far-field pattern-based method. The proposed IDM/modified-CGF methodology is validated by analyzing a two-element MIMO antennas based on strip-dipole pairs for a wide range of practical indoor/outdoor non-uniform scenario parameters.