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In which of the following feed system, the power division among elements on aperture is done in several steps?

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In which of the following feed system, the power division among elements on aperture is done in several steps?

(a) Constrained feed systems

(b) Optical feed systems

(c) Lens array

(d) Reflect array

The question was asked at a job interview.

The question is from Phased Array in section Phased, Adaptive and Binomial Arrays of Antennas

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Correct option is (a) Constrained feed systems

For explanation I would say: The power is divided into many elements under different steps in constrained feed systems. Phased array antennas with lens or reflector arrays belong to the optical feed system. Proper aperture illumination is obtained through the optical feed system and systems power is divided in one step.

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