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Which of the following determines the direction of the antenna beam in ESA?

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Which of the following determines the direction of the antenna beam in ESA?

(a) Physical direction of antenna

(b) Direction of aircraft nose

(c) Slope of the phase taper

(d) Mechanical gimbal
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The correct choice is (c) Slope of the phase taper

The best I can explain: The ESA controls the beam by phase shifters. The slope of the phase taper determines the direction in which the antenna beam will be pointed.
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