Discussion
What does the Ruze equation describe?
Answer: A
Ruze relates the root mean square surface error, measured in wavelengths, to the gain lost and the scattered power that appears in the side lobes. An error of a sixteenth of a wavelength costs about a decibel, which is the usual manufacturing criterion. The other options describe beamwidth scaling, feed positioning and bandwidth, all of which are governed by different relations. Ruze is what turns a mechanical tolerance into an electrical specification, and it is why the same dish is excellent at one frequency and useless at ten times it.
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