Discussion
What is spillover in a reflector antenna?
Answer: C
Spillover is the portion of the feed pattern that passes beyond the edge of the reflector and is lost, or worse, arrives as a side lobe pointing at warm ground. Illuminating the edge weakly reduces it but worsens the taper efficiency, so an optimum edge taper of about ten decibels is usual. Panel leakage, coverage footprint and strut scattering are all real effects but are separately named. The taper against spillover trade is the central compromise in feed design.
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