Discussion
What does a superstrate layer above a patch do?
Answer: D
A dielectric cover of the right thickness forms a partially reflecting surface that resonates with the ground plane and concentrates the radiation, raising gain by several decibels. A wrongly chosen thickness does the opposite. Radomes over patches must therefore be designed rather than merely fitted. Absorption is small in a good dielectric, the pattern remains broadside, and the ground plane is essential. A layer that looks like mere protection can change the electrical behaviour substantially.
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