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Which of the following efficiency is used to measure the power-loss at the feed pattern which is intercepted by reflector?

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Which of the following efficiency is used to measure the power-loss at the feed pattern which is intercepted by reflector?

(a) Spillover

(b) Illumination

(c) Taper

(d) Aperture

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Enquiry is from Basics topic in chapter Reflector Antenna of Antennas

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The correct answer is (a) Spillover

The best explanation: When the feed pattern exceeds beyond reflectors rim, not all the energy is redirected by the reflector. This power loss is measure results in spillover efficiency. Illumination efficiency is the combination of both taper and spillover efficiency. Aperture efficiency is the ratio of effective aperture to physical aperture. Taper efficiency gives the directivity measure of the antenna.

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