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An ungrounded antenna near the ground ________

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An ungrounded antenna near the ground ________

(a) must be horizontally polarized

(b) acts as an antenna array

(c) is unlikely to need a ground screen

(d) acts as a single antenna of twice the height

This question was posed to me in a job interview.

Enquiry is from Asynchronous TDM in chapter Multiplexing & Sampling of Bandpass Signal of Analog Communications

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Correct answer is (b) acts as an antenna array

To explain I would say: An ungrounded antenna near the ground acts as an antenna array. An antenna array is a combination of multiple antennae which function as a single antenna to perform the required task.

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