Discussion
Statement I: Aperture efficiency includes the effect of illumination taper.
Statement II: Aperture efficiency includes the effect of spillover past the reflector edge.
In the light of the above statements, choose the correct answer.
Answer: C
Both statements are correct. Aperture efficiency is the product of several factors, of which taper and spillover are the two largest and the ones that trade directly against each other, with blockage, phase error, surface tolerance and cross polarisation loss making up the rest. Quoting a single efficiency figure without saying which factors it includes is a frequent source of disagreement between a manufacturer's specification and a measured result.
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