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What do you understand by isotropic antenna?

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What do you understand by isotropic antenna?

(a) it radiates its power uniformly in all directions

(b) it radiates its power non-uniformly in all directions

(c) it radiates its power specifically in one direction only

(d) it does not radiate any power

This question was posed to me in homework.

Enquiry is from Time Domain Description topic in chapter Double Sideband Suppressed Carrier Modulation of Analog Communications

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The correct option is (a) it radiates its power uniformly in all directions

The best explanation: An isotropic antenna is considered to be an ideal antenna that radiates power uniformly in all directions. Generally, this type of antenna does not exist. However, it is often used to determine certain antenna characteristics like antenna gain.

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