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In which of the following secondary reflector is convex?

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In which of the following secondary reflector is convex?

(a) Gregorian

(b) Cassegrain

(c) Parabolic

(d) Corner

The question was asked in unit test.

The doubt is from Application of Parabolic Reflector in section Reflector Antenna of Antennas

1 Answer

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Correct answer is (b) Cassegrain

The explanation is: Dual reflector antennas have both primary and secondary reflectors. Cassegrain and Gregorian antennas are dual reflector antennas. Secondary reflector is convex for Cassegrain antenna. In Gregorian concave ellipsoidal is used as secondary reflector. Parabolic and corner antennas are normal reflector antennas.

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