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If you are referring to mutual coupling, I would expect a Sxy value rather than an impedance. As any transmission path, it can be measured by two port method, and as with any antenna measurement, you have to consider cable effects.
I guess mutual coupling and mutual impedance are two different phenomena. I m wrong?
The mutual impedance is determined by subtracting the input impedance of the single patch from the input impedance of the patch with the other patch. 1 port measurement should be ok.
According to the definition in text books, the mutual impedance could be calculated from two-port S-parameters. Mutual coupling would be just another representation of the same data, I think.
Determining the mutual impedance as a one-port measurement requires, that the impedance of a single element has been measured in absence of the other before. Also the mutual impedance has to be calculated. Thus I assume a two port measurement as more reliable. In any case, the mutual impedance is a kind of virtual parameter, that can't be directly measured and is strongly affected by a varied antenna port reference plane.
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