0

16kviews

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 8.2 years ago by teamques10 ★ 69k

modified 3.2 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

ADD COMMENT FOLLOW SHARE EDIT

1 Answer

0

2.1kviews

written 8.2 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)$= 10 log⁡D \\ =12.497 dB$

ADD COMMENT SHARE EDIT