Discussion
Why does aperture coupling allow the substrates to be chosen independently?
Answer: A
Because the feed network and the patch sit on opposite sides of a common ground plane, each can use the substrate that suits it: a thin dense board for compact low radiation circuitry and a thick light one for an efficient wideband patch. The slot sets the coupling strength through its length and position rather than acting as a universal transformer, the coupling does involve the dielectrics, and both structures work at the same frequency. Separating two requirements onto two substrates is the neat idea here.
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