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  1. Which TM mode in rectangular waveguide has lowest cutoff frequency?

    2. A.
    TM11
    B.
    TM01
    C.
    TM10
    D.
    TM21

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    Answer : Option A

    Explanation :

    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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