Rectangular
waveguide dimensions
Updated November
3, 2012
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 October 2012! We've updated the table to include WR75, 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 industrywide
agreement.
The interior of a standard rectangular
waveguide has a 2:1 aspect ratio in most cases (not exactly true for WR90 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 EM waves only over a certain frequency band,
depending on the crosssectional 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 handcalculated and it is always possible that they may suffer from keypunch error... these were directly calculated by multiplying inches by 25.4 with no rounding.
WR159 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) 

WR2300 
0.32  0.49 
23.000 x 11.500 
584.2 x 292.1 

WR2100 
0.35  0.53 
21.000 x 10.500 
533.4 x 266.7 

WR1800 
0.43  0.62 
18.000 x 9.000 
457.2 x 288.6 

WR1500 
0.49  0.74 
15.000 x 7.500 
381.0 x 190.5 

WR1150 
0.64  0.96 
11.500 x 5.750 
292.1 x 146.05 

WR1000 
0.75  1.1 
9.975 x 4.875 
253.365 x 126.6825 

WR770 
0.96  1.5 
7.700 x 3.385 
195.58 x 97.79 

WR650 
1.12
to 1.70 
6.500
x 3.250 
165.1 x 82.55 
R
band 
WR430

1.70
to 2.60 
4.300
x 2.150 
109.22 x 54.61 
D
band 
WR340

2.20
to 3.30 
3.400
x 1.700 
86.36 x 43.18 
S
band 
WR284 
2.60
to 3.95 
2.840
x 1.340 
72.136 x 34.036 
E
band 
WR229

3.30
to 4.90 
2.290
x 1.150 
58.166 x 29.21 
G
band

WR187

3.95
to 5.85 
1.872
x 0.872 
47.5488 x 22.1488 
F
band 
WR159

4.90
to 7.05 
1.590
x 0.795 
40.386 x 20.193 
C
band

WR137 
5.85
to 8.20 
1.372
x 0.622 
34.8488 x 15.7988 
H
band

WR112

7.05
to 10.00 
1.122
x 0.497 
28.4988 x 12.6238 
X band 
WR90 
8.2 to 12.4 
0.900 x 0.400 
22.86 x 10.16 
XKu band 
WR75 
10.0 to 15.0 
0.750 x 0.375 
19.05 x 9.525 
Ku band 
WR62 
12.4 to 18.0 
0.622 x 0.311 
15.7988 x 7.8994 
K band 
WR51 
15.0 to 22.0 
0.510 x 0.255 
12.954 x 6.477 
K band 
WR42 
18.0 to 26.5 
0.420 x 0.170 
10.668 x 4.318 
Ka band 
WR28 
26.5 to 40.0 
0.280 x 0.140 
7.112 x 3.556 
Q band 
WR22 
33 to 50 
0.224 x 0.112 
5.6896 x 2.8448 
U band 
WR19 
40 to 60 
0.188 x 0.094 
4.7752 x 2.3876 
V band 
WR15 
50 to 75 
0.148 x 0.074 
3.7592 x 1.8796 
E band 
WR12 
60 to 90 
0.122 x 0.061 
3.0988 x 1.5494 
W band 
WR10 
75 to 110 
0.100 x 0.050 
2.54 x 1.27 
F band 
WR8 
90 to 140 
0.080 x 0.040 
2.032 x 1.016 
D band 
WR6 
110 to 170 
0.0650 x 0.0325 
1.651 x 0.8255 
G band 
WR5 
140 to 220 
0.0510 x 0.0255 
1.2954 x 0.6477 

WR4 
170 to 260 
0.0430 x 0.0215 
1.0922 x 0.5461 

WR3 
220 to 325 
0.0340 x 0.0170 
0.8636 x 0.4318 
Yband 
WR2 
325 to 500 
0.0200 x 0.0100 
0.508 x 0.254 

WR1.5 
500 to 750 
0.0150 x 0.0075 
0.381 x 0.1905 

WR1 
750 to 1100 
0.0100 x 0.0050 
0.254 x0.127 
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 WR62 (if you look closely at the caliper it indicates
620 mils), which is used in Kuband.
