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In a paraboloid antenna, all rays leaving the focal point are collimated along the reflector’s axis after reflection.

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In a paraboloid antenna, all rays leaving the focal point are collimated along the reflector’s axis after reflection.

(a) True

(b) False

This question was posed to me in final exam.

The question is from Parabolic Reflector Antenna topic in section Reflector Antenna of Antennas

1 Answer

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Correct option is (a) True

Best explanation: According to the geometry of the paraboloid reflector,

⇨ All rays leaving the focal point are collimated along the reflector’s axis after reflection.

⇨ All overall ray path lengths (from the focal point to the reflector and on to the aperture plane) are the same and equal to 2F.

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