The cut off wavelength in circular waveguide guide diameter square of guide diam

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Question
The cut off wavelength in circular waveguide
Options
A. guide diameter
B. square of guide diameter
C. cube of guide diameter
D. square root of guide diameter

Correct Answer

guide diameter

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

?_c = 1.706 D for TE₁₁ mode

?_c = 1.029 D for TE₂₁ mode

?_c = 0.82 D for TE₀₁ mode

?_c = 1.306 D for TM₀₁ mode.

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