Calculate the front-to-back ratio of an antenna in dB which

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Calculate the front-to-back ratio of an antenna in dB which radiates 3 kW in its most optimum direction and 500 watts in the opposite direction—

1. 0.782
2. 7.782
3. – 22.22
4. None of these

Correct Option: B

Front to back ratio

G_dB = 10 log₁₀		3000
		300

= 10 log₁₀6 = 7.782