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Which of the following is used to avoid the aperture blockage due to secondary reflector?

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Which of the following is used to avoid the aperture blockage due to secondary reflector?

(a) Offset feed system

(b) Cassegrain

(c) Plane reflector

(d) Parabolic antenna

I got this question during an interview.

My doubt is from Aperture Blockage in division Reflector Antenna of Antennas

1 Answer

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Best answer
Correct answer is (a) Offset feed system

The best explanation: Offset feed system is used to avoid the aperture blocking effect due to the dependence of secondary reflector. In this a feed radiator is placed at the focus in an inclined position such that all rays are collimated without formation of blockage region. In Cassegrain, plane reflector there is a blocking effect.

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