The following is a chart on waveguide dimensions.

Waveguide frequency bands and interior sizes

Frequency Band
Waveguide StandardFrequency Limits (GHz)Inside Dimensions (inches)
 WR-23000.32 – 0.4923.000 x 11.500
 WR-21000.35 – 0.5321.000 x 10.500
 WR-1800 0.43 – 0.6218.000 x 9.000
 WR-15000.49 – 0.7415.000 x 7.500
 WR-11500.64 – 0.9611.500 x 5.750
 WR-10000.75 – 1.19.975 x 4.875
 WR-7700.96 – 1.57.700 x 3.385
 WR-6501.12 to 1.706.500 x 3.250
R bandWR-4301.70 to 2.604.300 x 2.150
D bandWR-3402.20 to 3.303.400 x 1.700
S bandWR-2842.60 to 3.952.840 x 1.340
E bandWR-2293.30 to 4.902.290 x 1.150
G band
WR-1873.95 to 5.851.872 x 0.872
F bandWR-1594.90 to 7.051.590 x 0.795
C band
WR-1375.85 to 8.201.372 x 0.622
H band
WR-1127.05 to 10.001.122 x 0.497
X bandWR-908.2 to 12.40.900 x 0.400
Ku bandWR-6212.4 to 18.00.622 x 0.311
K bandWR-5115.0 to 22.00.510 x 0.255
K bandWR-4218.0 to 26.50.420 x 0.170
Ka bandWR-2826.5 to 40.00.280 x 0.140
Q bandWR-2233 to 500.224 x 0.112
U bandWR-1940 to 600.188 x 0.094
V bandWR-1550 to 750.148 x 0.074
E band
WR-1260 to 900.122 x 0.061
W bandWR-1075 to 1100.100 x 0.050
F bandWR-890 to 1400.080 x 0.040
D bandWR-6110 to 1700.0650 x 0.0325
G bandWR-5140 to 2200.0510 x 0.0255
WR-4
170 to 2600.0430 x 0.0215
WR-3220 to 3250.0340 x 0.0170
Y-bandWR-2325 to 5000.0200 x 0.0100
WR-1.5500 to 7500.0150 x 0.0075
WR-1750 to 11000.0100 x 0.0050