Rectangular Waveguide Sizes

Rectangular Waveguide Sizes

A Rectangular Waveguide is an electromagnetic feed line that is used for high frequency signals. Rectangular Waveguide conduct microwave energy has lower insertion loss than coaxial cables.

A Rectangular Waveguide must have a certain minimum cross section, relative to the wavelength of the signal to function properly. If wavelength of the signal is too long (Frequency is too low) when compared to the cross section of the waveguide, the electromagnetic fields cannot propagate. The lowest frequency range at which a waveguide will operate is where the cross section is large enough to fit one complete wavelength of the signal.

 

Rectangular Waveguide Sizes

Waveguide nameRecommended frequencyCutoff frequency
lowest order mode
Cutoff frequency
next mode
Inner dimensions of waveguide opening
EIARCSC *IECA inch[mm]B inch[mm]
WR2300WG0.0R30.32 to 0.45 GHz0.257 GHz0.513 GHz23 [584.2]11.5 [292.1]
WR2100WG0R40.35 to 0.50 GHz0.281 GHz0.562 GHz21 [533.4]10.5 [266.7]
WR1800WG1R50.45 to 0.63 GHz0.328 GHz0.656 GHz18 [457.2]9 [228.6]
WR1500WG2R60.50 to 0.75 GHz0.393 GHz0.787 GHz15 [381]7.5 [190.5]
WR1150WG3R80.63 to 0.97 GHz0.513 GHz1.026 GHz11.5 [292.1]5.75 [146.05]
WR975WG4R90.75 to 1.15 GHz0.605 GHz1.211 GHz9.75 [247.65]4.875 [123.825]
WR770WG5R120.97 to 1.45 GHz0.766 GHz1.533 GHz7.7 [195.58]3.85 [97.79]
WR650WG6R141.15 to 1.72 GHz0.908 GHz1.816 GHz6.5 [165.1]3.25 [82.55]
WR510WG7R181.45 to 2.20 GHz1.157 GHz2.314 GHz5.1 [129.54]2.55 [64.77]
WR430WG8R221.72 to 2.60 GHz1.372 GHz2.745 GHz4.3 [109.22]2.15 [54.61]
WG92.20 to 3.30 GHz1.686 GHz3.372 GHz3.5 [88.9]1.75 [44.45]
WR340WG9AR262.20 to 3.30 GHz1.736 GHz3.471 GHz3.4 [86.36]1.7 [43.18]
WR284WG10R322.60 to 3.95 GHz2.078 GHz4.156 GHz2.84 [72.136]1.34 [34.036]
WG113.30 to 4.90 GHz2.488 GHz4.976 GHz2.372 [60.2488]1.122 [28.4988]
WR229WG11AR403.30 to 4.90 GHz2.577 GHz5.154 GHz2.29 [58.166]1.145 [29.083]
WR187WG12R483.95 to 5.85 GHz3.153 GHz6.305 GHz1.872 [47.5488]0.872 [22.1488]
WR159WG13R584.90 to 7.05 GHz3.712 GHz7.423 GHz1.59 [40.386]0.795 [20.193]
WR137WG14R705.85 to 8.20 GHz4.301 GHz8.603 GHz1.372 [34.8488]0.622 [15.7988
WR112WG15R847.05 to 10 GHz5.26 GHz10.52 GHz1.122 [28.4988]0.497 [12.6238]
WR1027.00 to 11 GHz5.786 GHz11.571 GHz1.02 [25.908]0.51 [12.954]
WR90WG16R1008.20 to 12.40 GHz6.557 GHz13.114 GHz0.9 [22.86]0.4 [10.16]
WR75WG17R12010.00 to 15 GHz7.869 GHz15.737 GHz0.75 [19.05]0.375 [9.525]
WR62WG18R14012.40 to 18 GHz9.488 GHz18.976 GHz0.622 [15.7988]0.311 [7.8994]
WR51WG19R18015.00 to 22 GHz11.572 GHz23.143 GHz0.51 [12.954]0.255 [6.477]
WR42WG20R22018.00 to 26.50 GHz14.051 GHz28.102 GHz0.42 [10.668]0.17 [4.318]
WR34WG21R26022.00 to 33 GHz17.357 GHz34.715 GHz0.34 [8.636]0.17 [4.318]
WR28WG22R32026.50 to 40 GHz21.077 GHz42.154 GHz0.28 [7.112]0.14 [3.556]
WR22WG23R40033.00 to 50 GHz26.346 GHz52.692 GHz0.224 [5.6896]0.112 [2.8448]
WR19WG24R50040.00 to 60 GHz31.391 GHz62.782 GHz0.188 [4.7752]0.094 [2.3876]
WR15WG25R62050.00 to 75 GHz39.875 GHz79.75 GHz0.148 [3.7592]0.074 [1.8796]
WR12WG26R74060 to 90 GHz48.373 GHz96.746 GHz0.122 [3.0988]0.061 [1.5494]
WR10WG27R90075 to 110 GHz59.015 GHz118.03 GHz0.1 [2.54]0.05 [1.27]
WR8WG28R120090 to 140 GHz73.768 GHz147.536 GHz0.08 [2.032]0.04 [1.016]
WR6WG29R1400110 to 170 GHz90.791 GHz181.583 GHz0.065 [1.651]0.0325 [0.8255]
WR7WG29R1400110 to 170 GHz90.791 GHz181.583 GHz0.065 [1.651]0.0325 [0.8255]
WR5WG30R1800140 to 220 GHz115.714 GHz231.429 GHz0.051 [1.2954]0.0255 [0.6477]
WR4WG31R2200172 to 260 GHz137.243 GHz274.485 GHz0.043 [1.0922]0.0215 [0.5461]
WR3WG32R2600220 to 330 GHz173.571 GHz347.143 GHz0.034 [0.8636]0.017 [0.4318]

Note:

  • The “WR” designation stands for Rectangular Waveguides
  • The Number that follows “WR” is the width of the waveguide opening in mils, divided by 10. For Example WR-650 means a waveguide whose cross section width is 6500 mils.
  • The waveguide width determines the lower cutoff frequency and is equal (ideally) to ½ wavelength of the lower cutoff frequency.