An antenna with an efficiency of 90% has a maximum radiation intensity of 0.5 W/Steradian. Calculate the directive gain of the antenna when the input power to the antenna is 0.4 W.

An antenna with an efficiency of 90% has a maximum radiation intensity

1.	An antenna with an efficiency of 90% has a maximum radiation intensity of 0.5 W/Steradian. Calculate the directive gain of the antenna when the input power to the antenna is 0.4 W.
A.	18.23
B.	17.4
C.	11.2
D.	21.6
Answer» C. 11.2

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An antenna with an efficiency of 90% has a maximum radiation intensity of 0.5 W/Steradian. Calculate the directive gain of the antenna when the input power to the antenna is 0.4 W.

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