Field and Wave Electromagnetics 2nd Edition by David Cheng

Exercise 55

An air-filled rectangular waveguide made of copper and having transverse dimensions a = 7.20 (cm) and b = 3.40 (cm) operates at a frequency 3 (GHz) in the dominant mode. Find (a) f c , (b) g , (c) c , and (d) the distance over which the field intensities of the propagating wave will be attenuated by 50%.