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In which of the following a sub-reflector called trans-reflector is present?

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In which of the following a sub-reflector called trans-reflector is present?

(a) Polarization-twist reflector

(b) Plane reflector

(c) Cassegrain

(d) Gregorian

This question was posed to me in an online interview.

My doubt is from Aperture Blockage topic in portion Reflector Antenna of Antennas

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Best answer
The correct option is (a) Polarization-twist reflector

Best explanation: It is present in Polarization-twist reflector. Sub-reflector consists of a horizontal grating of wires. Cassegrain contains a hyperboloid sub-reflector. Gregorian contains an ellipsoidal sub-reflector.

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