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How is the radar beam moved in the ESA?

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How is the radar beam moved in the ESA?

(a) Phase shift

(b) Mechanical gimbal

(c) Mechanical servos

(d) Hydraulics
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The correct answer is (a) Phase shift

Explanation: In ESA, the antenna’s beam is moved electronically by setting the phase angles of phase shifters located at each radiating element to provide a linear phase taper across the array surface.
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