Discussion
What is the radiation pattern of a patch antenna over a large ground plane?
Answer: C
The two radiating edges add in phase broadside, and the ground plane suppresses radiation backwards, so the pattern is a single broad lobe pointing away from the board. That makes patches natural for conformal mounting on a surface that should radiate outward. A doughnut belongs to a dipole, end fire to a travelling wave structure, and an omnidirectional pattern in the board plane to a monopole. The pattern follows directly from the two slot model.
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