| Frequency Band | Frequency (GHz) | Circular Waveguide Size (Inches) | Circular Waveguide Size (mm) |
|---|---|---|---|
| X | 8.2-9.97 | 1.094 | 27.79 |
| 8.5-11.6 | 0.938 | 23.83 | |
| 9.97-12.4 | 0.797 | 20.24 | |
| Ku | 12.4-15.9 | 0.688 | 17.48 |
| 13.4-18.0 | 0.594 | 15.08 | |
| 15.9-18.0 | 0.500 | 12.70 | |
| K | 17.5-20.5 | 0.455 | 11.56 |
| 20-24.5 | 0.396 | 10.06 | |
| 24-26.5 | 0.328 | 8.33 | |
| Ka | 26.5-33 | 0.315 | 8.00 |
| 33-38.5 | 0.250 | 6.35 | |
| 38.5-40 | 0.219 | 5.56 | |
| Q | 33-38.5 | 0.250 | 6.35 |
| 38.5-43 | 0.219 | 5.56 | |
| 43-50 | 0.188 | 4.78 | |
| U | 40-43 | 0.210 | 5.33 |
| 43-50 | 0.188 | 4.78 | |
| 50-60 | 0.165 | 4.19 | |
| V | 50-58 | 0.165 | 4.19 |
| 58-68 | 0.141 | 3.58 | |
| 68-75 | 0.125 | 3.18 | |
| E | 60-66 | 0.136 | 3.45 |
| 66-82 | 0.125 | 3.18 | |
| 82-90 | 0.094 | 2.39 | |
| W | 75-88 | 0.112 | 2.84 |
| 88-110 | 0.094 | 2.39 | |
| F | 90-115 | 0.089 | 2.26 |
| 115-140 | 0.075 | 1.91 | |
| D | 110-140 | 0.073 | 1.85 |
| 140-160 | 0.059 | 1.50 | |
| G | 140-180 | 0.058 | 1.47 |
| 180-220 | 0.045 | 1.14 | |
| ? | 170-260 | 0.049 | 1.25 |
| 220-325 | 0.039 | 0.99 |
