The radiation resistance of an antenna is 72 Ω, and loss

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The radiation resistance of an antenna is 72 Ω, and loss resistance is 8 Ω. What is the directivity if the power gain is 16?

1. 17.78
2. 14.4
3. 16
4. None of these

Correct Option: A

Directivity = G/η , where η = efficiency

=	R_r	=	72	=	72	=	9	= 0.9
	R_r + R_l		72 + 8		80		10

Now,

D =	16	= 17.78
	0.9