Discussion
Which single factor most often limits the aperture efficiency of a simple prime focus dish?
Answer: B
On a well made dish at moderate frequency the taper against spillover compromise typically costs the most, holding aperture efficiency near sixty per cent even when everything else is good. Surface error dominates only at high frequency, cross polarisation is a small power loss though an important specification, and feed mismatch is normally a few per cent at worst. Shaped dual reflectors exist precisely because they attack this dominant term, and they are worth the complexity for that reason.
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