-
An antenna has a power input of 40 π watts and a efficiency of 90%. The radiation intensity has to have a max of 150 W/unit solid angle. Directivity—
-
- 13.5
- 16.67
- 1.333
- 1.0748
Correct Option: B
We know,
| D = | → gain of antenna → efficiency of antenna Gain | η |
| Gain = | = 15 | 40π | (input power) |
and directivity,
| D = | = | = 16.67 | η | 0.9 |
