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  1. The cut off wavelength in circular waveguide

    2. A.
    guide diameter
    B.
    square of guide diameter
    C.
    cube of guide diameter
    D.
    square root of guide diameter

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    Answer : Option A

    Explanation :

    Some applications require dual polarization capability. Circular waveguide has this capability.

    These analysis uses cylindrical coordinates.

    In circular waveguide TE11 mode has the lowest cut off frequency and is the dominant mode.

    If D is diameter of waveguide

    λc = 1.706 D for TE11 mode

    λc = 1.029 D for TE21 mode

    λc = 0.82 D for TE01 mode

    λc = 1.306 D for TM01 mode.

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