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A transmitting antenna radiates 251 W isotropically. A receiving antenna located 100 m away from the transmitting antenna has an effective aperture of 500 cm2. The total received power by the antenna is—
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- 10 µW
- 1 µW
- 20 µW
- 100 µW
Correct Option: D
As we know from the relation that
| PR = | |
| 4∏r2 |
where GT = 1 for isotropic antenna
| PR = | |
| 4∏r2 |
| PR = | |
| 4∏ × (100)2 |
= 99.86 µW
