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Exam Questions Papers - Engineering

Q1:

A short grounded vertical antenna has a length L which is 0.05λ at frequency f. If its radiation resistance at f is R ohms, then its radiation resistance at a frequency 2f will be

A R/2Ω

B RΩ

C 2RΩ

D 4RΩ

ANS:D - 4RΩ

Rr = 80p2 ∴ Rr ∝ f2.