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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

This question was addressed to me in an internship interview.

My question is from Electronic Scanned Array Radar topic in chapter Surveillance Systems, Mapping and Multimode Radars of Avionics

1 Answer

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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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