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In which of the following the secondary reflector faces the primary reflector?

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In which of the following the secondary reflector faces the primary reflector?

(a) Cassegrain

(b) Gregorian

(c) Corner reflector

(d) Plane reflector

I got this question in unit test.

The origin of the question is Aperture Blockage in chapter Reflector Antenna of Antennas

1 Answer

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Correct option is (b) Gregorian

Easiest explanation: In Gregorian antenna, sub-reflector is ellipsoidal and has its concave side faces the primary reflector. In Cassegrain, sub-reflector is hyperboloid with its convex side facing the feed. Corner and plane reflectors are normal reflector antennas while Cassegrain and Gregorian are dual reflector antennas.

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