Question

Find the diameter of the conical horn operating at frequency 900MHz with the slant length 1.5cm?

(a) 1.224 cm

(b) 12.24 cm

(c) 0.122 cm

(d) 1.224 m

This question was addressed to me in homework.

The doubt is from Design topic in portion Horn Antenna of Antennas

Answer 1

Correct answer is (b) 12.24 cm

The explanation is: Diameter \( = \sqrt{3λL}=\sqrt{\frac{3c}{f} L}=\sqrt{\frac{3×3×10^10}{900×10^6}×1.5}=12.24 cm \)