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The radiation resistance of antenna is $72\Omega$ and the loss resistance is $8\Omega$. Calculate its directivity in dB if the power gain is 16.

written 8.0 years ago by teamques10 ★ 69k

modified 2.9 years ago by pedsangini276 • 4.8k

Mumbai University > Electronics Engineering > Sem 5 > Electromagnetic Engineering

Marks: 5 Marks

Year: Dec 2014

electromagnetic field and wave theory

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written 8.0 years ago by teamques10 ★ 69k

Given: Radiation resistance = Rr = 72Ω

Loss resistance Rl = 8Ω

G = 16

1. $η =\dfrac{R_R}{R_A+ R_L} ×100 \\ η=90 \%$

2. G$= η D \\ =17.77$

3. D(dB)$= 10 log⁡D \\ =12.497 dB$

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