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An antenna has “gain” as compared to ________

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An antenna has “gain” as compared to ________

(a) Helical antenna

(b) Marconi antenna

(c) Vertically polarized radiator

(d) Isotropic radiator

I have been asked this question during an online exam.

Query is from Frequency Translation topic in section Modulation of Analog Communications

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The correct answer is (d) Isotropic radiator

The explanation is: Isotropic radiator is considered as an ideal antenna. So all the gains of any antenna is estimated by comparing with it only.

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