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Antenna Characteristics Parameters (Part 2)

A certain ant...

Question

A certain antenna with an efficiency of 90% has maximum radiation intensity of 0.5 W/sr . If radiated power is 0.3 W. then the directivity of antenna is

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Solution

$D = \frac{4 π U_{m a x}}{P_{r a d}}$

$= \frac{4 π \times 0.5}{0.3} = 20.94$

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