WG and WR waveguide dimensions and sizes

- RF waveguide dimensions, waveguide sizes, cut off frequencies and other waveguide data for WR waveguide and WG waveguide systems.


RF waveguides used for the transmission of radio frequency energy come in a variety of sizes and designations such as WG waveguide and WR waveguide are seen in the specifications and literature.Waveguide sizes and waveguide dimensions determine the properties of the RF waveguide, including parameters such as the waveguide cut off frequency and many other properties.

Waveguide sizes are standardised to enable waveguides from different manufacturers to be used together. In this way the industry is able to benefit from the ability to use waveguide with known properties, etc.


Waveguide size standards

There are a number of different standards for waveguides. These tend tob e country specific. Some of the major standards include:

  • WR waveguide system:   EIA designation (Standard US) using a WR designator to indicate the size
  • WG waveguide system:   RCSC Designation (Standard UK)

Both systems are in widespread use and enable the waveguide sizes to be matched and known>.


WG waveguide sizes and dimensions

The figures given below are for rigid rectangular waveguides, as these are the most common form of waveguide used.



WG Design Freq range* Waveguide cut off * Theoretical attn dB / 30m Material Band Waveguide dimensions (mm)
WG00 0.32 - 0.49 0.256 0.051 - 0.031 Alum B 584 x 292
WG0 0.35 - 0.53 0.281 0.054 - 0.034 Alum B,C 533 x 267
WG1 0.41 - 0.625 0.328 0.056 - 0.038 Alum B,C 457 x 229
WG2 0.49 - 0.75 0.393 0.069 - 0.050 Alum C 381 x 191
WG3 0.64 - 0.96 0.513 0.128 - 0.075 Alum C 292 x 146
WG4 0.75 - 1.12 0.605 0.137 - 0.095 Alum C,D 248 x 124
WG5 0.96 - 1.45 0.766 0.201 - 0.136 Alum D 196 x 98
WG6 1.12 - 1.70 0.908 0.317 - 0.212 Brass D 165 x 83
WG6 1.12 - 1.70 0.908 0.269 - 0.178 Alum D 165 x 83
WG7 1.45 - 2.20 1.157     D,E 131 x 65
WG8 1.70 - 2.60 1.372 0.588 - 0.385 Brass E 109 x 55
WG8 1.70 - 2.60 1.372 0.501 - 0.330 Alum E 109 x 55
WG9A 2.20 - 3.30 1.736 0.877 - 0.572 Brass E,F 86 x 43
WG9A 2.20 - 3.30 1.736 0.751 - 0.492 Alum E,F 86 x 43
WG10 2.60 - 3.95 2.078 1.102 - 0.752 Brass E,F 72 x 34
WG10 2.60 - 3.95 2.078 0.940 - 0.641 Alum E,F 72 x 34
WG11A 3.30 - 4.90 2.577     F,G 59 x 29
WG12 3.95 x 5.85 3.152 2.08 - 1.44 Brass F,G 48 x 22
WG12 3.95 x 5.85 3.152 1.77 - 1.12 Alum F,G 48 x 22
WG13 4.90 - 7.05 3.711     G,H 40 x 20
WG14 5.85 - 8.20 4.301 2.87 - 2.30 Brass H 35 x 16
WG14 5.85 - 8.20 4.301 2.45 - 1.94 Alum H 35 x 16
WG15 7.05 - 10.0 5.26 4.12 - 3.21 Brass I 29 x 13
WG15 7.05 - 10.0 5.26 3.50 - 2.74 Alum I 29 x 13

WG waveguide dimensions, sizes and waveguide cut-off frequencies
for rigid rectangular RF waveguides

* waveguide cut off frequency in GHz and for TE10 mode
Alum = Aluminium


US WR waveguide sizes

The WR waveguide designation system is used within the USA and is also widely used in many other areas around the globe. Like the WG waveguide sizes, the WR waveguide designations start with the letters WR.


WR Designation WG Equivalent Standard Freq Range GHz Inside dimensions (inches)
WR340 WG9A 2.20 - 3.30 3.400 x 1.700
WR284 WG10 2.60 - 3.95 2.840 x 1.340
WR229 WG11A 3.30 - 4.90 2.290 x 1.150
WR187 WG12 3.95 - 5.85 1.872 x 0.872
WR159 WG13 4.90 - 7.05 1.590 x 0.795
WR137 WG14 5.85 - 8.20 1.372 x 0.622
WR112 WG15 7.05 - 10.00 1.122 x 0.497
WR90 WG16 8.2 - 12.4 0.900 x 0.400
WR75 WG17 10.0 - 15.0 0.750 x 0.375
WR62 WG18 12.4 - 18.0 0.622 x 0.311
WR51 WG19 15.0 - 22.0 0.510 x 0.255
WR42 WG20 18.0 - 26.5 0.420 x 0.170
WR28 WG22 26.5 - 40.0 0.280 x 0.140
WR22 WG23 33 - 50 0.224 x 0.112
WR19 WG24 40 - 60 0.188 x 0.094
WR15 WG25 50 - 75 0.148 x 0.074
WR12 WG26 60 - 90 0.122 x 0.061

WR waveguide dimensions, sizes and waveguide cut-off frequencies
for rigid rectangular RF waveguides

It can be seen from the table that the WR number is taken from the internal measurement in mils of the wider side of the waveguide.

The waveguide dimensions are of great importance as they determine the operating range of the waveguide. The standard waveguide sizes also enable complete coverage of the frequency spectrum, and choice of the particular waveguide size for a given application should take account of the frequency range required as well as other considerations including loss, mechanical size and weight, etc..

By Ian Poole


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