Which of the following condition holds good for minimum total aperture blocking in Cassegrain?(a) Area of sub-reflector and projected area of feed are equal(b) Area of primary reflector and projected area of feed are equal(c) Area of sub-reflector greater than area of primary reflector(d) Area of sub-reflector is less than projected area of feedThis question was posed to me by my school teacher while I was bunking the class.This question is from Aperture Blockage in chapter Reflector Antenna of Antennas

Which of the following condition holds good for minimum total aperture

1.	Which of the following condition holds good for minimum total aperture blocking in Cassegrain?(a) Area of sub-reflector and projected area of feed are equal(b) Area of primary reflector and projected area of feed are equal(c) Area of sub-reflector greater than area of primary reflector(d) Area of sub-reflector is less than projected area of feedThis question was posed to me by my school teacher while I was bunking the class.This question is from Aperture Blockage in chapter Reflector Antenna of Antennas
Answer» Correct choice is (a) Area of sub-reflector and projected area of feed are equal The EXPLANATION is: Minimum total aperture blocking OCCURS when the area of sub-reflector and projected area of feed are approximately equal. In other CONDITIONS, the main ray back radiated ray GETS added up with collinear RAYS from the primary reflector.

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