The dimensions and operating frequencies of a rectangular waveguide are chosen to support only one propagating mode. … 6.4. 3 Practical Rectangular Waveguide. ModeCut-off frequency (GHz)TE1021.07 GHzTE0142.15 GHzTE1147.13 GHzTM10not supported6.4: Rectangular Waveguide – Engineering LibreTexts eng.libretexts.org › … › 6: Waveguides