Rectangular Waveguide Calculator (Cutoff Frequency)

How to use the Rectangular Waveguide Calculator

1. Enter or select: Broad wall a, Narrow wall b, Mode type, Mode index m, Mode index n, Operating frequency.
2. The results (Cutoff frequency fc, Propagation, Cutoff wavelength, Guide wavelength λg, Phase velocity, Group velocity, Wave impedance, Single-mode (TE₁₀) band) are calculated instantly as you type.
3. Use “Copy link” to share the calculation with the same input values.

Formula

• f_c = (c/2)·√((m/a)² + (n/b)²)
• λ_g = λ/√(1 − (f_c/f)²)
• Z_TE = η/√(1 − (f_c/f)²), Z_TM = η√(1 − (f_c/f)²)