Explain why a two wire transmission line has no cut off frequency but a rectangular waveguide has.
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A rectangular waveguide is a hollow metallic tube with a rectangular cross section. The conducting walls of the waveguide confine the electromagnetic fields and thereby guide the electromagnetic wave. The rectangular waveguide is basically characterized by its dimensions i.e., length a and breadth b.
TEM modes only exist in waveguides with two or more conductors. Usually they are called transmission lines. If they have more than two conductors, they can be used to carry a DC current. ... There actually is no upper frequency cutoff for the TEM mode.
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