Question

Find the aperture width of the H-plane horn operating at frequency 900MHz with the slant length 5cm?

(a) 2.236 cm

(b) 22.36 cm

(c) 0.224 cm

(d) 2.236 m

I got this question in homework.

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

Answer 1

The correct option is (b) 22.36 cm

The explanation is: Aperture width \( = \sqrt{3λL}=\sqrt{\frac{3c}{f} L}=\sqrt{\frac{3×3×10^{10}}{900×10^6}×5}=22.36 cm\)