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In which of the following the power is divided in single step among the elements?

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In which of the following the power is divided in single step among the elements?

(a) Optical feed system

(b) Constrained feed system

(c) Parallel feed system

(d) Sub-array

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I'm obligated to ask this question of Phased Array in division Phased, Adaptive and Binomial Arrays of Antennas

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Right answer is (a) Optical feed system

To explain: Proper aperture illumination is obtained by the optical feed system. In constrained the power is divided into many elements under different steps. In optical feed systems power is divided in one step. In parallel feed, a number of radiators are combined into sub-arrays and then to elements in series or center fed.

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