GATE EC 2001 Electromagnetics Solution Q 6

GATE EC 2001 Electromagnetics Solution Q 6

A medium wave radio transmitter operating at a wavelength of 492 m has a tower antenna of height 124 m. What is the radiation resistance of the antenna ?

(a) 25\;\Omega

(b) 36.5\;\Omega

(c) 50\;\Omega

(d) 73\;\Omega

Ans :- (b)

Explanation

\frac\lambda4=\frac{492}4=123\simeq L

So, it is a quarter wave monopole antenna. Hence,

R_a=36.5\;\Omega

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