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In which of the following feed there is no impedance mismatch?

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In which of the following feed there is no impedance mismatch?

(a) Offset feed

(b) Cassegrain feed

(c) Front feed

(d) Gregorian feed

This question was posed to me in my homework.

This intriguing question originated from Application of Parabolic Reflector topic in section Reflector Antenna of Antennas

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Right option is (a) Offset feed

The best I can explain: In Front feed, due to the reflections from the dishes impedance mismatch occurs. Cassegrain and Gregorian are front feed dual reflectors. Offset feed there is no aperture blocking and no impedance mismatch.

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