Rectangular Waveguide Dimensions: Standard WR Sizes Chart
Rectangular waveguides are essential components in RF and microwave engineering, offering efficient transmission of high-frequency signals. These waveguides are available in standard sizes, commonly denoted by WR numbers, such as WR28 and WR90 which indicate specific dimensions and frequency ranges. Understanding the dimensions and applications of various WR sizes is crucial for designing systems in radar, satellite communications, and test equipment. This guide presents a comprehensive chart of standard WR waveguide dimensions to assist engineers and designers in selecting the right waveguide for their applications.
Waveguide sizes
Following table mentions frequency, broad dimension and narrow dimensions for various waveguide sizes. It covers standard waveguide dimensions from WR-1 to WR-2300.
| Waveguide Size (USA std.) | Frequency (GHz) | Broad dimension-b (Inch) | Narrow dimension-a (Inch) | b (mm) | a (mm) |
| WR-2300 | 0.32-0.49 | 23.0000 | 11.5000 | 584.2 | 292.1 |
| WR-2100 | 0.35-0.53 | 21.000 | 10.5000 | 533.4 | 266.7 |
| WR-1800 | 0.43-0.62 | 18.000 | 9.0000 | 457.2 | 228.6 |
| WR-1500 | 0.49-0.74 | 15.000 | 7.5000 | 381 | 190.5 |
| WR-1150 | 0.64-0.96 | 11.500 | 5.7500 | 292.1 | 146.05 |
| WR-1000 | 0.75-1.1 | 9.975 | 4.9875 | 253.365 | 126.6825 |
| WR-975 | 0.75-1.12 | 9.750 | 4.8750 | 247.65 | 123.825 |
| WR-770 | 0.96-1.46 | 7.700 | 3.8500 | 195.58 | 97.79 |
| WR-650 | 1.12-1.70 | 6.500 | 3.2500 | 165.1 | 82.55 |
| WR-510 | 1.45-2.20 | 5.100 | 2.5500 | 129.54 | 64.77 |
| WR-430 | 1.70-2.60 | 4.300 | 2.1500 | 109.22 | 54.61 |
| WR-340 | 2.20-3.30 | 3.400 | 1.7000 | 86.36 | 43.18 |
| WR-284 | 2.60-3.95 | 2.840 | 1.4200 | 72.136 | 36.068 |
| WR-229 | 3.30-4.90 | 2.290 | 1.1450 | 58.166 | 29.083 |
| WR-187 | 3.95-5.85 | 1.870 | 0.9350 | 47.498 | 23.749 |
| WR-159 | 4.90-7.05 | 1.590 | 0.7950 | 40.386 | 20.193 |
| WR-137 | 5.85-8.20 | 1.370 | 0.6850 | 34.798 | 17.399 |
| WR-112 | 7.05-10.0 | 1.120 | 0.5600 | 28.448 | 14.224 |
| WR-102 | 7.00-11.0 | 1.020 | 0.5100 | 25.908 | 12.954 |
| WR-90 | 8.20-12.40 | 0.900 | 0.400 | 22.86 | 11.43 |
| WR-75 | 10.0-15.0 | 0.750 | 0.3750 | 19.05 | 9.525 |
| WR-62 | 12.40-18.0 | 0.620 | 0.3100 | 15.748 | 7.874 |
| WR-51 | 15.0-22.0 | 0.510 | 0.2550 | 12.954 | 6.477 |
| WR-42 | 18.0-26.5 | 0.420 | 0.2100 | 10.668 | 5.334 |
| WR-28 | 26.5-40.0 | 0.280 | 0.1400 | 7.112 | 3.556 |
| WR-22 | 33.0-50.0 | 0.220 | 0.1100 | 5.588 | 2.794 |
| WR-19 | 40.0-60.0 | 0.190 | 0.0950 | 4.826 | 2.413 |
| WR-15 | 50.0-75.0 | 0.150 | 0.0750 | 3.81 | 1.905 |
| WR-12 | 60.0-90.0 | 0.120 | 0.0600 | 3.048 | 1.524 |
| WR-10 | 75.0-110.0 | 0.100 | 0.0500 | 2.54 | 1.27 |
| WR-8 | 90.0-140.0 | 0.080 | 0.0400 | 2.032 | 1.016 |
| WR-6 | 110.0-170.0 | 0.065 | 0.0325 | 1.651 | 0.8255 |
| WR-5 | 140.0-220.0 | 0.051 | 0.0255 | 1.2954 | 0.6477 |
| WR-4 | 170.0-260.0 | 0.043 | 0.0215 | 1.0922 | 0.5461 |
| WR-3 | 220.0-325.0 | 0.034 | 0.0170 | 0.8636 | 0.4318 |
| WR-2 | 325.0-500.0 | 0.020 | 0.0100 | 0.508 | 0.254 |
| WR-1 | 750.0-1100.0 | 0.010 | 0.0050 | 0.254 | 0.127 |
Conclusion
Rectangular waveguides, with their standardized WR sizes, provide a reliable solution for transmitting microwave signals with minimal loss. The waveguide size chart serves as a valuable reference for matching waveguides to specific frequency bands and applications. By selecting the correct waveguide dimensions, engineers can ensure optimal system performance in high frequency designs. Whether for commercial or industrial use, rectangular waveguides remain a cornerstone of microwave technology.