1.

Which TM mode in rectangular waveguide has lowest cutoff frequency?

Answer» Hz = 0 Ex = ± ZTM Hy Ey = ± ZTM Hx where E0 is the amplitude of the wave. The expressions for β, λc, fc, λg, a are the same as for TE waves. For TM wave the lowest cut off frequency in rectangular wave guide is for TM11 mode. If , the cutoff frequency for TM11 mode is about 12% more than that for TE20 mode.


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