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Which one of the following reasons for the use of a ground screen with antennas is false?

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Which one of the following reasons for the use of a ground screen with antennas is false?

(a) Impossibility of a good ground connection

(b) Provision of an earth for the antenna

(c) Protection of personnel working underneath

(d) Improvement of radiation pattern of antenna

I have been asked this question at a job interview.

This intriguing question comes from Asynchronous TDM in section Multiplexing & Sampling of Bandpass Signal of Analog Communications

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Correct option is (c) Protection of personnel working underneath

To explain I would say: If we consider the use of ground as a screen with antenna then there is no chance that it is used for protection of personnel working underneath.

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