Thanks for you response Smrity Dwivedi . I have another question, for example in a 4X4 MIMO configuration is possible calculated the TARC parameter with the equation attached in the figure, where:
θ: is the phase difference between port 1 and port 2.
θʹ: is the phase difference between port 1 and port 3.
θʹʹ: is the phase difference between port 1 and port 4.
What should be the phase difference between each of the ports?