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Which of the following regarding the Cassegrain feed system is false?

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Which of the following regarding the Cassegrain feed system is false?

(a) Spill over is reduced

(b) It is a dual reflector antenna

(c) Minor lobe radiation increases

(d) A convex sub-reflector is used

The question was posed to me in an internship interview.

The query is from Feeding Systems topic in chapter Reflector Antenna of Antennas

1 Answer

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Right choice is (c) Minor lobe radiation increases

The explanation: Spill over is the power loss when the reflector fails to redirect the energy. With the use of sub-reflector, this is reduced. Thus the minor lobe radiation also decreased. A convex hyperboloid is used as a sub-reflector. It is a dual reflector antenna with primary and two secondary radiators.

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