Abstract: A useful model for analyzing the effect of mutual coupling (MC) of the X-type polarization diversity system is propounded by the cascading of coupling coefficients matrix from the equivalent network model. The analytical expressions for both the average received power for each antenna element and spatial correlation between elements are also derived, and the effects of both MC and the mean Direction of Arrival (DOA) on the average power and capacity of MIMO wireless channels could be investigated, with the characters of the effect of mutual coupling in a dipole system shown.

Key words: polarization diversity, mutual coupling, spatial correlation, channel capacity