Question

What is the approximate distance between directors for a Yagi-Uda antenna operating at frequency 150MHz?

(a) 0.4m

(b) 1.6m

(c) 2m

(d) 4.8m

This question was addressed to me in a job interview.

My query is from Construction of Yagi in chapter Folded Dipole & Yagi – Uda Antenna of Antennas

Answer 1

Right choice is (a) 0.4m

Best explanation: λ = \(\frac{c}{f} = \frac{3×10^8}{150MHz}=2m \)

The distance between directors of Yagi-Uda antenna is 0.2λ

⇨ D=0.2λ=0.2(2)=0.4m