Correlation Reduction in a 4-Element MIMO Antenna using Partially Reflective Surface

This works presents the reduction of the correlation coefficients in a four element (2x2) multiple-input-multiple-output (MIMO) antenna using a partially reflective surface (PRS). The PRS has a phase gradient in two dimensions and is used above the radiating elements in a Fabry-Perot cavity configuration with reduced height. The system is designed for operation at 10 GHz. The effectiveness of the technique is demonstrated by computing and comparing the correlation coefficients based on far-fields, for with and without the PRS. The proposed structure results in more than 65% reduction in each of the three correlation coefficients, thus projecting enhanced MIMO performance.