Waveguide Sizes
A waveguide is an electromagnetic feed line that is used for high frequency signals.
Waveguides conduct microwave energy at lower loss than coaxial cables and are used
in microwave communications, radars and other high frequency applications.
The 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.
Geometrically speaking there are three types of waveguides – Rectangular Waveguides,
Double Rigid Waveguides and Circular Waveguides. The tables below will give you
details on the various waveguide sizes and their properties.
Rectangular Waveguide Sizes
| Waveguide name |
Recommended frequency |
Cutoff frequency
lowest order mode |
Cutoff frequency
next mode |
Inner dimensions of waveguide opening |
| EIA |
RCSC * |
IEC |
|
|
|
A inch[mm] |
B inch[mm] |
| WR2300 |
WG0.0 |
R3 |
0.32 to 0.45 GHz |
0.257 GHz |
0.513 GHz |
23 [584.2] |
11.5 [292.1] |
| WR2100 |
WG0 |
R4 |
0.35 to 0.50 GHz |
0.281 GHz |
0.562 GHz |
21 [533.4] |
10.5 [266.7] |
| WR1800 |
WG1 |
R5 |
0.45 to 0.63 GHz |
0.328 GHz |
0.656 GHz |
18 [457.2] |
9 [228.6] |
| WR1500 |
WG2 |
R6 |
0.50 to 0.75 GHz |
0.393 GHz |
0.787 GHz |
15 [381] |
7.5 [190.5] |
| WR1150 |
WG3 |
R8 |
0.63 to 0.97 GHz |
0.513 GHz |
1.026 GHz |
11.5 [292.1] |
5.75 [146.05] |
| WR975 |
WG4 |
R9 |
0.75 to 1.15 GHz |
0.605 GHz |
1.211 GHz |
9.75 [247.65] |
4.875 [123.825] |
| WR770 |
WG5 |
R12 |
0.97 to 1.45 GHz |
0.766 GHz |
1.533 GHz |
7.7 [195.58] |
3.85 [97.79] |
| WR650 |
WG6 |
R14 |
1.15 to 1.72 GHz |
0.908 GHz |
1.816 GHz |
6.5 [165.1] |
3.25 [82.55] |
| WR510 |
WG7 |
R18 |
1.45 to 2.20 GHz |
1.157 GHz |
2.314 GHz |
5.1 [129.54] |
2.55 [64.77] |
| WR430 |
WG8 |
R22 |
1.72 to 2.60 GHz |
1.372 GHz |
2.745 GHz |
4.3 [109.22] |
2.15 [54.61] |
|
WG9 |
|
2.20 to 3.30 GHz |
1.686 GHz |
3.372 GHz |
3.5 [88.9] |
1.75 [44.45] |
| WR340 |
WG9A |
R26 |
2.20 to 3.30 GHz |
1.736 GHz |
3.471 GHz |
3.4 [86.36] |
1.7 [43.18] |
| WR284 |
WG10 |
R32 |
2.60 to 3.95 GHz |
2.078 GHz |
4.156 GHz |
2.84 [72.136] |
1.34 [34.036] |
|
WG11 |
|
3.30 to 4.90 GHz |
2.488 GHz |
4.976 GHz |
2.372 [60.2488] |
1.122 [28.4988] |
| WR229 |
WG11A |
R40 |
3.30 to 4.90 GHz |
2.577 GHz |
5.154 GHz |
2.29 [58.166] |
1.145 [29.083] |
| WR187 |
WG12 |
R48 |
3.95 to 5.85 GHz |
3.153 GHz |
6.305 GHz |
1.872 [47.5488] |
0.872 [22.1488] |
| WR159 |
WG13 |
R58 |
4.90 to 7.05 GHz |
3.712 GHz |
7.423 GHz |
1.59 [40.386] |
0.795 [20.193] |
| WR137 |
WG14 |
R70 |
5.85 to 8.20 GHz |
4.301 GHz |
8.603 GHz |
1.372 [34.8488] |
0.622 [15.7988 |
| WR112 |
WG15 |
R84 |
7.05 to 10 GHz |
5.26 GHz |
10.52 GHz |
1.122 [28.4988] |
0.497 [12.6238] |
| WR102 |
|
|
7.00 to 11 GHz |
5.786 GHz |
11.571 GHz |
1.02 [25.908] |
0.51 [12.954] |
| WR90 |
WG16 |
R100 |
8.20 to 12.40 GHz |
6.557 GHz |
13.114 GHz |
0.9 [22.86] |
0.4 [10.16] |
| WR75 |
WG17 |
R120 |
10.00 to 15 GHz |
7.869 GHz |
15.737 GHz |
0.75 [19.05] |
0.375 [9.525] |
| WR62 |
WG18 |
R140 |
12.40 to 18 GHz |
9.488 GHz |
18.976 GHz |
0.622 [15.7988] |
0.311 [7.8994] |
| WR51 |
WG19 |
R180 |
15.00 to 22 GHz |
11.572 GHz |
23.143 GHz |
0.51 [12.954] |
0.255 [6.477] |
| WR42 |
WG20 |
R220 |
18.00 to 26.50 GHz |
14.051 GHz |
28.102 GHz |
0.42 [10.668] |
0.17 [4.318] |
| WR34 |
WG21 |
R260 |
22.00 to 33 GHz |
17.357 GHz |
34.715 GHz |
0.34 [8.636] |
0.17 [4.318] |
| WR28 |
WG22 |
R320 |
26.50 to 40 GHz |
21.077 GHz |
42.154 GHz |
0.28 [7.112] |
0.14 [3.556] |
| WR22 |
WG23 |
R400 |
33.00 to 50 GHz |
26.346 GHz |
52.692 GHz |
0.224 [5.6896] |
0.112 [2.8448] |
| WR19 |
WG24 |
R500 |
40.00 to 60 GHz |
31.391 GHz |
62.782 GHz |
0.188 [4.7752] |
0.094 [2.3876] |
| WR15 |
WG25 |
R620 |
50.00 to 75 GHz |
39.875 GHz |
79.75 GHz |
0.148 [3.7592] |
0.074 [1.8796] |
| WR12 |
WG26 |
R740 |
60 to 90 GHz |
48.373 GHz |
96.746 GHz |
0.122 [3.0988] |
0.061 [1.5494] |
| WR10 |
WG27 |
R900 |
75 to 110 GHz |
59.015 GHz |
118.03 GHz |
0.1 [2.54] |
0.05 [1.27] |
| WR8 |
WG28 |
R1200 |
90 to 140 GHz |
73.768 GHz |
147.536 GHz |
0.08 [2.032] |
0.04 [1.016] |
| WR6 |
WG29 |
R1400 |
110 to 170 GHz |
90.791 GHz |
181.583 GHz |
0.065 [1.651] |
0.0325 [0.8255] |
| WR7 |
WG29 |
R1400 |
110 to 170 GHz |
90.791 GHz |
181.583 GHz |
0.065 [1.651] |
0.0325 [0.8255] |
| WR5 |
WG30 |
R1800 |
140 to 220 GHz |
115.714 GHz |
231.429 GHz |
0.051 [1.2954] |
0.0255 [0.6477] |
| WR4 |
WG31 |
R2200 |
172 to 260 GHz |
137.243 GHz |
274.485 GHz |
0.043 [1.0922] |
0.0215 [0.5461] |
| WR3 |
WG32 |
R2600 |
220 to 330 GHz |
173.571 GHz |
347.143 GHz |
0.034 [0.8636] |
0.017 [0.4318] |
| WR2 |
- |
- |
325-500 GHz |
- |
- |
0.020 [0.508] |
0.010 [0.254] |
| WR1 |
- |
- |
750-1100 GHz |
- |
- |
0.010 [0.254] |
0.0050 [0.127] |
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.
Double-ridge waveguides are rectangular waveguides with two ridges protruding parallel
to the short wall. This increases the E-Field in the waveguide improving performance.
Double Ridge Waveguide Sizes
Designation
(a)=aluminum, (b)=brass, (c)=copper, (s)=silver |
fL - fU*
(GHz) |
fCO**
(GHz) |
Inside
Width
(in) |
Inside
Height
(in) |
| WR |
U.S. Mil.
__ /U |
British
Mil. |
IEC |
| WR975 |
RG204 (a) |
|
|
0.75-1.12 |
0.605 |
9.750 |
4.875 |
| WR770 |
RG205 (a) |
|
|
0.96-1.45 |
0.766 |
7.700 |
3.850 |
| WR650 |
RG69 (b)
RG103 (a) |
WG6 |
|
1.12-1.70 |
0.908 |
6.500 |
3.250 |
| WR510 |
|
|
|
1.45-2.20 |
1.157 |
5.100 |
2.550 |
| WR430 |
RG104 (b)
RG105 (a) |
WG8 |
|
1.70-2.60 |
1.372 |
4.300 |
2.150 |
| WR340 |
RG112 (b)
RG113 (a) |
WG9A |
|
2.20-3.30 |
1.736 |
3.400 |
1.700 |
| WR284 |
RG48 (b)
RG75 (a) |
WG10 |
|
2.60-3.95 |
2.078 |
2.840 |
1.340 |
| WR229 |
RG340 (c)
RG341 (a) |
WG11A |
R40 |
3.30-4.90 |
2.577 |
2.290 |
1.145 |
| WR187 |
RG49 (b)
RG95 (a) |
WG12 |
R48 |
3.95-5.85- |
3.152 |
1.872 |
0.872 |
| WR159 |
RG343 (c)
RG344 (a) |
WG13 |
R58 |
4.90-7.05 |
3.712 |
1.590 |
0.795 |
| WR137 |
RG50 (b)
RG106 (a) |
WG14 |
R70 |
5.850-8.200 |
4.301 |
1.372 |
0.622 |
| WR112 |
RG51 (b)
RG68 (a) |
WG15 |
R84 |
7.050-10.000 |
5.260 |
1.122 |
0.497 |
| WR90 |
RG52 (b)
RG67 (a) |
WG16 |
R100 |
8.20-12.40 |
6.56 |
0.900 |
0.400 |
| WR75 |
RG346 (c)
RG347 (a) |
WG17 |
|
10.0-15.0 |
7.87 |
0.750 |
0.375 |
| WR62 |
RG91 (b)
RG349 (a) |
WG18 |
|
12.40-18.00 |
9.49 |
0.622 |
0.311 |
| WR51 |
RG352 (c)
RG351 (a) |
WG19 |
|
15.00-22.00 |
11.6 |
0.510 |
0.255 |
| WR42 |
RG53 (b)
RG121 (a) |
WG20 |
|
18.00-26.5 |
14.1 |
0.420 |
0.170 |
| WR34 |
RG354 (c) |
|
|
20.0-33.0 |
17.4 |
0.340 |
0.170 |
| WR28 |
RG96 (s)
RG271 (c) |
WG22 |
|
26.50-40.00 |
21.1 |
0.280 |
0.140 |
| WR22 |
RG97 (s) |
WG23 |
|
33.00-50.00 |
26.4 |
0.224 |
0.112 |
| WR19 |
|
WG24 |
|
40.00-60.00 |
31.4 |
0.188 |
0.0940 |
| WR15 |
RG98 (s) |
WG25 |
|
50.00-75.00 |
39.9 |
0.148 |
0.0740 |
| WR12 |
RG99 (s) |
WG26 |
|
60.00-90.00 |
48.4 |
0.122 |
0.0610 |
| WR10 |
|
WG27 |
|
75.00-110.0 |
59.0 |
0.100 |
0.0500 |
| WR8 |
RG138 (s) |
WG28 |
|
90.00-140.0 |
73.8 |
0.0800 |
0.0400 |
| WR7 |
RG136 (s) |
|
|
110.0-170.0 |
90.8 |
0.0650 |
0.0325 |
| WR4 |
RG137 |
|
|
170.0-260.0 |
137 |
0.0430 |
0.0215 |
| WR3 |
RG139 (s) |
|
|
220.0-325.0 |
174 |
0.0340 |
0.0170 |
Circular Waveguide Sizes
| FrequencyBand |
Frequency Range |
Circular WaveguideDiameter, Inches (mm) |
Cover Flange (Brass)MIL-F- 3922 UG |
Flange Type |
| X |
LOW |
8.2-9.97 |
1.094 (27.79) |
53-001 UG-39/U |
Square |
| MID |
8.5-11.6 |
0.938 (23.83) |
| HIGH |
9.97-12.4 |
0.797 (20.24) |
| Ku |
LOW |
12.4-15.9 |
0.688 (17.48) |
53-005 UG-1666/U |
Square |
| MID |
13.4-18.0 |
0.594 (15.08) |
| HIGH |
15.9-18.0 |
0.500 (12.70) |
| K |
LOW |
17.5-20.5 |
0.455 (11.56) |
54-001 UG-595/U |
Square |
| MID |
20-24.5 |
0.396 (10.06) |
| HIGH |
24-26.5 |
0.328 (8.33) |
| Ka |
LOW |
26.5-33 |
0.315 (8.00) |
54-003 UG-595/U |
Square |
| MID |
33-38.5 |
0.250 (6.35) |
| HIGH |
38.5-40 |
0.219 (5.56) |
| Q |
LOW |
33-38.5 |
0.250 (6.35) |
67B-006 UG-383/U |
Round |
| MID |
38.5-43 |
0.219 (5.56) |
| HIGH |
43-50 |
0.188 (4.78) |
| U |
LOW |
40-43 |
0.210 (5.33) |
67B-007 UG-383/U-M |
Round |
| MID |
43-50 |
0.188 (4.78) |
| HIGH |
50-60 |
0.165 (4.19) |
| V |
LOW |
50-58 |
0.165 (4.19) |
67B-008 UG-385/U |
Round |
| MID |
58-68 |
0.141 (3.58) |
| HIGH |
68-75 |
0.125 (3.18) |
| E |
LOW |
60-66 |
0.136 (3.45) |
67B-009 UG-387/U |
Round |
| MID |
66-82 |
0.125 (3.18) |
| HIGH |
82-90 |
0.094 (2.39) |
| W |
LOW |
75-88 |
0.112 (2.84) |
67B-010 UG-387/U-M |
Round |
| HIGH |
88-110 |
0.094 (2.39) |
| F |
LOW |
90-115 |
0.089 (2.26) |
-UG-387/U-M |
Round |
| HIGH |
115-140 |
0.075 (1.91) |
| D |
LOW |
110-140 |
0.073 (1.85) |
-UG-387/U-M |
Round |
| HIGH |
140-160 |
0.059 (1.50) |
| G |
LOW |
140-180 |
0.058 (1.47) |
-UG-387/U-M |
Round |
| HIGH |
180-220 |
0.045 (1.14) |
| --- |
--- |
170-260 |
0.049 (1.25) |
-UG-387/U-M |
Round |
| --- |
--- |
220-325 |
0.039 (0.99) |
-UG-387/U-M |
Round |
