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Calculate the radiation efficiency of an antenna if the input power is 100 W and the power dissipated is 5W:
1. 0.05
2. 0.95
3. 1
4. 0.4

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Correct Answer - Option 1 : 0.05

Concept:

  • An antenna receives electric signals from the transmitter circuits and converts them into electromagnetic waves.
  • The efficiency of the antenna in performing this conversion, known as antenna radiation efficiency, is defined as the ratio of the power dissipated into space to the net power delivered to the antenna by the transmitter circuits.
  • It is denoted by η.

 

Mathematically, the radiation efficiency is calculated as:

\(η=\frac{P_{dissipated}}{P_{input}}\)

Calculation:

With Pin = 100 W, and Pdissipated = 5 W

\(η=\frac{5}{100}\)

η = 0.05

Note: The percentage efficiency will be: 0.05 × 100 = 5 %

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