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Which of the following causes aperture blockage in a Cassegrain antenna?

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Which of the following causes aperture blockage in a Cassegrain antenna?

(a) Main reflector

(b) Sub-reflector

(c) Feed radiator

(d) Noise from surroundings
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Right answer is (b) Sub-reflector

Easiest explanation: The sub-reflector causes the aperture blockage in a Cassegrain antenna. It can be reduced by reducing the size of the sub-reflector.
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