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What is the power radiated by the antenna with gain called as?

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What is the power radiated by the antenna with gain called as?

(a) Critical power

(b) Transverse power

(c) Effective radiated power

(d) Transmitted power

I got this question in an interview.

Query is from Types of Antenna in section Antennas and Wave Propagation of Avionics

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The correct option is (c) Effective radiated power

The explanation is: The power radiated by an antenna with directivity and therefore gain is called the effective radiated power (ERP). The ERP is calculated by multiplying the transmitter power fed to the antenna Pt by the power gain Ap of the antenna.

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