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The approximate gain of a parabolic reflector antenna at operating frequency 40 GHz diameter 20 m and illumination efficiency is 55%—
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- 1.139 × 103
- 1.139 × 105
- 1.00 × 103
- None of these
Correct Option: C
| Gain GP = | . Ae | . AK | |||||||||
| λ2 |  |  | 2 | ||||||||
| = | × | | | . (65) | |||||||||
| | 2 | 4 | ||||||||||
| = | × π | | | × (.065) | 0.09 | 4 |
= 1.139 × 105
