# ieee mtt mtt-s microwave vswr RF calculator

## directional coupler smith chart microwave dictionary

September 22, 2014

## RectangularWaveguideDimensions

Our other info on waveguide can be found on these pages:

Waveguide primer (main waveguide page)

Waveguide mathematics

Waveguide construction

Waveguide loss calculation

New for September 2014! Here's two contributions from Spinner, on waveguide and waveguide flange dimensions, in pdf documents. These are the most comprehensive lists we have seen so far.

-          TD-00036 Issue K: CROSS REFERENCE FOR HOLLOW METALLIC WAVEGUIDES                    “Uli’s Waveguide List”

-          TD-00077 Issue B: FLANGES FOR ORDINARY RECTANGULAR WAVEGUIDES                        “Simone’s Flange List”

New for October 2012! We've updated the table to include WR-75, often used in SatCom work (thanks to Doug), and we've added a column for waveguide dimensions in millimeters.

We have a more complete waveguide table available in our download area, thanks to Alan D!

For the information below we reference Penn Engineering, and also a combination of material borrowed from Maury Microwave and ZAX Millimeter Wave Corporation web sites. The lower seven waveguide series were contributed by "Nameless Individual" from LockMart.

Although there are disagreements between waveguide vendors, our table is representative of the US system (other countries such as the U.K. have their own crappy nomenclature that is just as confusing). Note that two letters (F and G) are used twice in the table, illustrating the lack of industry-wide agreement.

The interior of a standard rectangular waveguide has a 2:1 aspect ratio in most cases (not exactly true for WR-90 and there are plenty of other exceptions). That is, the broad wall is twice the dimension of the narrow wall, or very nearly so. Rectangular waveguides support E-M waves only over a certain frequency band, depending on the cross-sectional dimensions. The bigger the size of the waveguide, the lower in frequency it works. Waveguides are specified in WR numbers. WR stands for "rectangular waveguide" except the military long ago decided that all adjectives must follow nouns for some reason.

Word of caution: depending on what reference you use, we have seen some disagreement in the height of the waveguide dimension, especially on the larger waveguide series such as WR650.

Further caution: the dimensions in millimeters were hand-calculated and it is always possible that they may suffer from key-punch error... these were directly calculated by multiplying inches by 25.4 with no rounding.

WR-159 was corrected on November 3, 2012 thanks to Steve...

### Waveguide frequency bands and interior dimensions

Frequency Band Waveguide Standard Frequency Limits (GHz) Inside Dimensions (inches) Inside Dimensions (mm)
WR-2300 0.32 - 0.49 23.000 x 11.500 584.2 x 292.1
WR-2100 0.35 - 0.53 21.000 x 10.500 533.4 x 266.7
WR-1800  0.43 - 0.62 18.000 x 9.000 457.2 x 288.6
WR-1500 0.49 - 0.74 15.000 x 7.500 381.0 x 190.5
WR-1150 0.64 - 0.96 11.500 x 5.750 292.1 x 146.05
WR-1000 0.75 - 1.1 9.975 x 4.875 253.365 x 126.6825
WR-770 0.96 - 1.5 7.700 x 3.385 195.58 x 97.79
WR-650 1.12 to 1.70 6.500 x 3.250 165.1 x 82.55
R band WR-430 1.70 to 2.60 4.300 x 2.150 109.22 x 54.61
D band WR-340 2.20 to 3.30 3.400 x 1.700 86.36 x 43.18
S band WR-284 2.60 to 3.95 2.840 x 1.340 72.136 x 34.036
E band WR-229 3.30 to 4.90 2.290 x 1.150 58.166 x 29.21
G band WR-187 3.95 to 5.85 1.872 x 0.872 47.5488 x 22.1488
F band WR-159 4.90 to 7.05 1.590 x 0.795 40.386 x 20.193
C band WR-137 5.85 to 8.20 1.372 x 0.622 34.8488 x 15.7988
H band WR-112 7.05 to 10.00 1.122 x 0.497 28.4988 x 12.6238
X band WR-90 8.2 to 12.4 0.900 x 0.400 22.86 x 10.16
X-Ku band WR-75 10.0 to 15.0 0.750 x 0.375 19.05 x 9.525
Ku band WR-62 12.4 to 18.0 0.622 x 0.311 15.7988 x 7.8994
K band WR-51 15.0 to 22.0 0.510 x 0.255 12.954 x 6.477
K band WR-42 18.0 to 26.5 0.420 x 0.170 10.668 x 4.318
Ka band WR-28 26.5 to 40.0 0.280 x 0.140 7.112 x 3.556
Q band WR-22 33 to 50 0.224 x 0.112 5.6896 x 2.8448
U band WR-19 40 to 60 0.188 x 0.094 4.7752 x 2.3876
V band WR-15 50 to 75 0.148 x 0.074 3.7592 x 1.8796
E band WR-12 60 to 90 0.122 x 0.061 3.0988 x 1.5494
W band WR-10 75 to 110 0.100 x 0.050 2.54 x 1.27
F band WR-8 90 to 140 0.080 x 0.040 2.032 x 1.016
D band WR-6 110 to 170 0.0650 x 0.0325 1.651 x 0.8255
G band WR-5 140 to 220 0.0510 x 0.0255 1.2954 x 0.6477
WR-4 170 to 260 0.0430 x 0.0215 1.0922 x 0.5461
WR-3 220 to 325 0.0340 x 0.0170 0.8636 x 0.4318
Y-band WR-2 325 to 500 0.0200 x 0.0100 0.508 x 0.254
WR-1.5 500 to 750 0.0150 x 0.0075 0.381 x 0.1905
WR-1 750 to 1100 0.0100 x 0.0050 0.254 x0.127

### Waveguide dimension rule of thumb

How do you know what WR number a waveguide is just by looking at it? The number is simply the dimension of the broad wall in mils, divided by 10. Thus the waveguide depicted below is WR-62 (if you look closely at the caliper it indicates 620 mils), which is used in Ku-band.

Author: The Unknown Editor
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