Rectangular Waveguide Dimensions: Standard WR Sizes Chart

Rectangular waveguides are indispensable 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

The following table mentions the frequency, broad dimension, and narrow dimension 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-23000.32-0.4923.000011.5000584.2292.1
WR-21000.35-0.5321.00010.5000533.4266.7
WR-18000.43-0.6218.0009.0000457.2228.6
WR-15000.49-0.7415.0007.5000381190.5
WR-11500.64-0.9611.5005.7500292.1146.05
WR-10000.75-1.19.9754.9875253.365126.6825
WR-9750.75-1.129.7504.8750247.65123.825
WR-7700.96-1.467.7003.8500195.5897.79
WR-6501.12-1.706.5003.2500165.182.55
WR-5101.45-2.205.1002.5500129.5464.77
WR-4301.70-2.604.3002.1500109.2254.61
WR-3402.20-3.303.4001.700086.3643.18
WR-2842.60-3.952.8401.420072.13636.068
WR-2293.30-4.902.2901.145058.16629.083
WR-1873.95-5.851.8700.935047.49823.749
WR-1594.90-7.051.5900.795040.38620.193
WR-1375.85-8.201.3700.685034.79817.399
WR-1127.05-10.01.1200.560028.44814.224
WR-1027.00-11.01.0200.510025.90812.954
WR-908.20-12.400.9000.40022.8611.43
WR-7510.0-15.00.7500.375019.059.525
WR-6212.40-18.00.6200.310015.7487.874
WR-5115.0-22.00.5100.255012.9546.477
WR-4218.0-26.50.4200.210010.6685.334
WR-2826.5-40.00.2800.14007.1123.556
WR-2233.0-50.00.2200.11005.5882.794
WR-1940.0-60.00.1900.09504.8262.413
WR-1550.0-75.00.1500.07503.811.905
WR-1260.0-90.00.1200.06003.0481.524
WR-1075.0-110.00.1000.05002.541.27
WR-890.0-140.00.0800.04002.0321.016
WR-6110.0-170.00.0650.03251.6510.8255
WR-5140.0-220.00.0510.02551.29540.6477
WR-4170.0-260.00.0430.02151.09220.5461
WR-3220.0-325.00.0340.01700.86360.4318
WR-2325.0-500.00.0200.01000.5080.254
WR-1750.0-1100.00.0100.00500.2540.127

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.