Discussion
The random surface error of a reflector is related to its gain loss by the _____ equation.
Answer: D
The Ruze equation converts a root mean square surface error, expressed in wavelengths, into a gain loss and a scattered side lobe level. It is what turns a mechanical tolerance into an electrical specification and sets the highest frequency at which a given reflector is worth using. Friis governs a transmission link, Babinet relates slots to dipoles, and Fraunhofer names the far field region rather than any equation about surfaces.
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