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Large f/D ratio is used for deep-dish reflectors.

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Large f/D ratio is used for deep-dish reflectors.

(a) True

(b) False

The question was asked in examination.

This is a very interesting question from Application of Parabolic Reflector topic in section Reflector Antenna of Antennas

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Right option is (b) False

Explanation: The ratio of focal length to the aperture size is known as the f/D ratio. Large f/D ratio is used for shallow-dish reflectors. Small f/D ratio is used for deep-dish reflectors. As the f/D ratio increases, the spillover efficiency of antenna reduces.

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