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 MIL-HDBK-419A
Figure 8-27. Enlarged View of Knitted Wire Mesh
8.5.3.1 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
d
= greatest dimension of rectangular waveguide in inches.
b
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