Question 1
If an electromagnetic wave described by the TE20 mode is excited and is propagating down the waveguide, what happens to the electromagnetic wave described by the TE10 mode?
Question 2
Is Kz (the direction of propagation down the waveguide) solely dependent on the cross section of the guiding structure?
Question 3
We learn in the TEM discussion that a center conductor is needed to support a TEM wave. Otherwise, only TE or TM waves can propagate down the wave guide. Consider a waveguide (for example, a circular length of pipe) and suppose we shine something like a laser beam down the waveguide. Is a TEM wave going from one end of the waveguide to the other? How do you reconcile this seemingly contradictory statements?