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What is the radiation resistance of a short dipole of length L?(a) 20π^2 \((\frac{L}{\lambda})^2\)(b) 80π^2 \((\frac{l}{\lambda})^2\)(c) 40π^2 \((\frac{l}{\lambda})^2\)(d) 160π^2 \((\frac{l}{\lambda})^2\)This question was posed to me in exam.My doubt is from Radiation Resistance topic in section Antenna Parameters of Antennas

Answer»

Correct option is (a) 20π^2 \((\frac{L}{\LAMBDA})^2\)

For explanation I would say: RADIATION resistance of a Hertzian dipole of LENGTH l is given by R=80π^2 \((\frac{l}{\lambda})^2\)

Then SHORT dipole is of length l/2, so the radiation resistance is given by R=80π^2\((\frac{L/2}{\lambda})^2=20\pi^2 (\frac{L}{\lambda})^2.\)


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