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Home ＞ News Center ＞ FAQ ＞ Waveguide Sizes
Waveguide Sizes
Source: | Author:TSI | Published time: 2016-08-20 | 680 Views | 🔊 Click to read aloud ❚❚ ▶ | Share:

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

Microwave Engineering Corporation | Rectangular Waveguide & Flanges

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] 
WR2300WG0.0 R3 0.32 to 0.45 GHz 0.257 GHz 0.513 GHz 23 [584.2] 11.5 [292.1] 
WR2100WG0 R4 0.35 to 0.50 GHz 0.281 GHz 0.562 GHz 21 [533.4] 10.5 [266.7] 
WR1800WG1 R5 0.45 to 0.63 GHz 0.328 GHz 0.656 GHz 18 [457.2] 9 [228.6] 
WR1500WG2 R6 0.50 to 0.75 GHz 0.393 GHz 0.787 GHz 15 [381] 7.5 [190.5] 
WR1150WG3 R8 0.63 to 0.97 GHz 0.513 GHz 1.026 GHz 11.5 [292.1] 5.75 [146.05] 
WR975WG4 R9 0.75 to 1.15 GHz 0.605 GHz 1.211 GHz 9.75 [247.65] 4.875 [123.825] 
WR770WG5 R12 0.97 to 1.45 GHz 0.766 GHz 1.533 GHz 7.7 [195.58] 3.85 [97.79] 
WR650WG6 R14 1.15 to 1.72 GHz 0.908 GHz 1.816 GHz 6.5 [165.1] 3.25 [82.55] 
WR510WG7 R18 1.45 to 2.20 GHz 1.157 GHz 2.314 GHz 5.1 [129.54] 2.55 [64.77] 
WR430WG8 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] 
WR340WG9A R26 2.20 to 3.30 GHz 1.736 GHz 3.471 GHz 3.4 [86.36] 1.7 [43.18] 
WR284WG10 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] 
WR229WG11A R40 3.30 to 4.90 GHz 2.577 GHz 5.154 GHz 2.29 [58.166] 1.145 [29.083] 
WR187WG12 R48 3.95 to 5.85 GHz 3.153 GHz 6.305 GHz 1.872 [47.5488] 0.872 [22.1488] 
WR159WG13 R58 4.90 to 7.05 GHz 3.712 GHz 7.423 GHz 1.59 [40.386] 0.795 [20.193] 
WR137WG14 R70 5.85 to 8.20 GHz 4.301 GHz 8.603 GHz 1.372 [34.8488] 0.622 [15.7988 
WR112WG15 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] 
WR90WG16 R100 8.20 to 12.40 GHz 6.557 GHz 13.114 GHz 0.9 [22.86] 0.4 [10.16] 
WR75WG17 R120 10.00 to 15 GHz 7.869 GHz 15.737 GHz 0.75 [19.05] 0.375 [9.525] 
WR62WG18 R140 12.40 to 18 GHz 9.488 GHz 18.976 GHz 0.622 [15.7988] 0.311 [7.8994] 
WR51WG19 R180 15.00 to 22 GHz 11.572 GHz 23.143 GHz 0.51 [12.954] 0.255 [6.477] 
WR42WG20 R220 18.00 to 26.50 GHz 14.051 GHz 28.102 GHz 0.42 [10.668] 0.17 [4.318] 
WR34WG21 R260 22.00 to 33 GHz 17.357 GHz 34.715 GHz 0.34 [8.636] 0.17 [4.318] 
WR28WG22 R320 26.50 to 40 GHz 21.077 GHz 42.154 GHz 0.28 [7.112] 0.14 [3.556] 
WR22WG23 R400 33.00 to 50 GHz 26.346 GHz 52.692 GHz 0.224 [5.6896] 0.112 [2.8448] 
WR19WG24 R500 40.00 to 60 GHz 31.391 GHz 62.782 GHz 0.188 [4.7752] 0.094 [2.3876] 
WR15WG25 R620 50.00 to 75 GHz 39.875 GHz 79.75 GHz 0.148 [3.7592] 0.074 [1.8796] 
WR12WG26 R740 60 to 90 GHz 48.373 GHz 96.746 GHz 0.122 [3.0988] 0.061 [1.5494] 
WR10WG27 R900 75 to 110 GHz 59.015 GHz 118.03 GHz 0.1 [2.54] 0.05 [1.27] 
WR8WG28 R1200 90 to 140 GHz 73.768 GHz 147.536 GHz 0.08 [2.032] 0.04 [1.016] 
WR6WG29 R1400 110 to 170 GHz 90.791 GHz 181.583 GHz 0.065 [1.651] 0.0325 [0.8255] 
WR7WG29 R1400 110 to 170 GHz 90.791 GHz 181.583 GHz 0.065 [1.651] 0.0325 [0.8255] 
WR5WG30 R1800 140 to 220 GHz 115.714 GHz 231.429 GHz 0.051 [1.2954] 0.0255 [0.6477] 
WR4WG31 R2200 172 to 260 GHz 137.243 GHz 274.485 GHz 0.043 [1.0922] 0.0215 [0.5461] 
WR3WG32 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)
WRU.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 


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