Question:
The ratio of the power radiated by an antenna to the total input power to the antenna is termed ________.
The ratio of the power radiated by an antenna to the total input power to the antenna is termed ________.
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Antenna efficiency is different from gain and directivity. Gain includes both efficiency and directivity, while directivity assumes ideal (lossless) conditions.
Updated On: Jun 23, 2025
- Directivity
- Antenna gain
- Radiation resistance of the antenna
- Antenna efficiency
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The Correct Option is D
Solution and Explanation
Antenna efficiency is a measure of how effectively an antenna converts the input power into radiated power. Mathematically, it is defined as: \[ \eta = \frac{P_{\text{rad}}}{P_{\text{input}}} \] Where:
\(P_{\text{rad}}\) = Radiated Power
\(P_{\text{input}}\) = Total Input Power (includes power lost as heat)
Antenna efficiency accounts for the losses within the antenna (such as conductor and dielectric losses) and tells us how much of the input power is actually used for radiation. Hence, the term described in the question directly refers to antenna efficiency.
Final Answer: (4) Antenna efficiency
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