Waveguide & Wavelength
Rectangular Waveguide Wavelength Calculator
Guide wavelength, free-space wavelength and cut-off for the TE10 mode of a rectangular waveguide.
Result
Enter the inputs above and select Calculate.
Formula: λ_g = λ₀ / √(1 − (λ₀ / λ_c)²), with λ_c = 2a
Below cut-off the mode is evanescent and the guide wavelength is undefined — the result reads “—” there.
The guide wavelength is always longer than the free-space wavelength, which is why waveguide sections are cut to λ_g and not λ₀.