Discussion
Why can an array that scans only near broadside use wider element spacing?
Answer: D
A grating lobe exists mathematically but only becomes visible when its direction falls within real space, and steering the beam pushes it towards the horizon. An array that never scans far can therefore use spacing up to nearly a full wavelength and use fewer elements for a given aperture. Coupling does not depend on the beam direction in that way, spacing certainly enters the array factor, and the element pattern attenuates rather than suppresses. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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