Quantcast Waveguide-Below-Cutoff

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Figure 8-27. Enlarged View of Knitted Wire Mesh Waveguide-Below-Cutoff.
A properly designed waveguide-below-cutoff opening will act like a high-pass filter. The cutoff frequency is a
function of the cross-section of the waveguide. For a cylindrical waveguide, the cutoff frequency of the
dominant TE mode is
The cutoff frequency for the TE mode of rectangular waveguide is
In these equations,
= cutoff frequency for the dominant mode in gigahertz,
= inside diameter of a cylindrical waveguide in inches, and
= greatest dimension of rectangular waveguide in inches.


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