Discussion
What is proximity coupling of a patch?
Answer: B
In proximity or electromagnetic coupling the microstrip line is sandwiched inside the dielectric stack and couples capacitively to the patch above it without touching. It gives wider bandwidth than a direct edge feed and avoids the probe inductance, but the multilayer construction is harder and alignment matters. Parasitic patch coupling and waveguide transitions are separate techniques. The family of feeding methods is best remembered by whether a galvanic connection is made and where the line sits.
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