Millimeter wave radar SoC (system on a chip) are evolving from 4 to 72 antennas on a single chip. Is there a simple (ELI5) explanation as to why 72 antennas (vs 4) are desirable?

My intuition says it improves either / both resolution and discrimination: the preferred explanation explains, in the simplest of terms qualitative terms that sharpens one's intuition and transitions \ follows-up with a mathematical treatise to the improvement.

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    $\begingroup$ Hi and welcome to Physics SE! I think this is a good question, but it might help if you could provide a reference (e.g. link to an external article). $\endgroup$ – Time4Tea Jul 29 '18 at 0:34
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    $\begingroup$ Search term "phased array". $\endgroup$ – dmckee Jul 29 '18 at 1:09

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