Design a rectangular waveguide with an aspect ratio of 3 to 1 for use in the K- band 18-26.5GHzAssume that the guide is air filled?

Oh, dude, designing a rectangular waveguide, huh? Alright, so for the K-band frequencies of 18-26.5GHz, you'd want a rectangular waveguide with a 3 to 1 aspect ratio and it's air-filled. Just make sure those dimensions are spot on to keep those electromagnetic waves in check. Good luck, my friend!