Discussion
Why does mutual coupling matter more in a closely spaced array?
Answer: C
The field from a neighbour falls with distance, so at a quarter wavelength the induced current is a large fraction of the driven one and the impedance shifts markedly. At a full wavelength it is much weaker. Feed length depends on the layout, resonant frequency is a property of the element, and grating lobes appear at wide rather than close spacing. Coupling is the reason an array cannot be designed one element at a time.
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