Got a little confused by the cutoff phenomena happened
in waveguides, need your help please.
a rectangular waveguide has its first two cutoff
freq to be TE10 ~ 6.56GHz and TE20 ~ 13.12GHz, and
I feed in a wave of freq 14GHz (does this wave have
to be a TE or TM wave so that it can actually propagate?)
, then there should have at least two modes(TE10&TE20)
co-exist inside the waveguide right? and, although
the wave bears two different modes for propagation,
it still maintains its own frequency, i.e. 14GHz,
right? if I'm right so far, then the thing bothers
me a lot is that, how can this monochromatic wave
having two different wavelengths inside the waveguide?
Thank you so much for your patient explanation!