1.

For a half-wave dipole with length λ/12, what is the antenna efficiency if the Radiation resistance is 2Ω?(a) 0.73(b) 0.073(c) 0.37(d) 0.78The question was posed to me during an interview for a job.Origin of the question is Radiation Resistance in section Antenna Parameters of Antennas

Answer»

Right OPTION is (a) 0.73

To ELABORATE: Radiation resistance \(R_{rad}=80π^2(\frac{l}{\lambda})^2=80π^2 (\frac{\lambda/12}{\lambda})^2\)=5.48Ω

Antenna EFFICIENCY \(\eta=\frac{R_{rad}}{R_{rad}+R_{LOSS}}=\frac{5.48}{5.48+2}=0.73\)


Discussion

No Comment Found

Related InterviewSolutions