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Which technique uses spot beam antennas to divide the area covered by the satellite into smaller segments?

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Which technique uses spot beam antennas to divide the area covered by the satellite into smaller segments?

(a) Spatial isolation

(b) Frequency reuse

(c) Multiplexing

(d) Modulation

I had been asked this question in an interview for internship.

I want to ask this question from Satellite Communication Systems topic in portion Satellite Communication of Avionics

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Right answer is (a) Spatial isolation

The explanation is: By using narrow beam or spot beam antennas, the area on the earth covered by the satellite can be divided up into smaller segments. Earth stations in each segment may actually use the same frequency, but because of the very narrow beam widths of the antennas, there is no interference between adjacent segments.

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