Discussion
What happens to a patch's front to back ratio on a small ground plane?
Answer: A
Waves reaching the edge of a small ground plane diffract around it and radiate backwards, so the front to back ratio falls and the pattern develops ripples. A ground plane extending a wavelength or so beyond the patch is a common rule. Surface wave energy is worse rather than better on a small board because the edge is nearer, the ground plane is electrically essential, and the pattern remains directional. Edge diffraction is the recurring penalty of finite structures.
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