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Waveguide & Flange Selection Guide |
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A few basic facts about waveguide: Here are Waveguide Equations & Fields
- The "WR" designation stands for "waveguide, rectangular"
- The wide inside dimension in inches is the "xxx" part of WRxxx; ie, WR650 is 6.50 inches, WR90 is 0.90 inches.
- The TE10 mode of propagation is the lowest mode that is supported.
- The waveguide width determines the lower cutoff frequency and is equal (ideally) to ½ wavelength of the lower
cutoff frequency.
- The TE20, occurs when the width equals one wavelength of the lower cutoff frequency, and so on
for higher modes.
- The TE01 mode occurs when the height equals ½ wavelength of the cutoff frequency, and so on to
higher modes.
- Click here for waveguide formulas.
An H-Bend is bent in the Hard direction (along the long side).
This is the direction of the H-field in the TE10 mode. |
An E-Bend is bent in the Easy direction (along the short side).
This is the direction of the E-field in the TE10 mode. |
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Standard Rectangular Waveguide
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Click here for handy free
"ezGuide" waveguide selector software from Andrew.
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| WR975 |
RG204 (a) |
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0.75-1.12 |
0.605 |
9.750 |
4.875 |
| WR770 |
RG205 (a) |
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|
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 |
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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 |
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2.20-3.30 |
1.736 |
3.400 |
1.700 |
| WR284 |
RG48 (b) RG75 (a) |
WG10 |
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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 |
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12.40-18.00 |
9.49 |
0.622 |
0.311 |
| WR51 |
RG352 (c) RG351 (a) |
WG19 |
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15.00-22.00 |
11.6 |
0.510 |
0.255 |
| WR42 |
RG53 (b) RG121 (a) |
WG20 |
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18.00-26.5 |
14.1 |
0.420 |
0.170 |
| WR34 |
RG354 (c) |
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20.0-33.0 |
17.4 |
0.340 |
0.170 |
| WR28 |
RG96 (s) RG271 (c) |
WG22 |
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26.50-40.00 |
21.1 |
0.280 |
0.140 |
| WR22 |
RG97 (s) |
WG23 |
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33.00-50.00 |
26.4 |
0.224 |
0.112 |
| WR19 |
|
WG24 |
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40.00-60.00 |
31.4 |
0.188 |
0.0940 |
| WR15 |
RG98 (s) |
WG25 |
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50.00-75.00 |
39.9 |
0.148 |
0.0740 |
| WR12 |
RG99 (s) |
WG26 |
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60.00-90.00 |
48.4 |
0.122 |
0.0610 |
| WR10 |
|
WG27 |
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75.00-110.0 |
59.0 |
0.100 |
0.0500 |
| WR8 |
RG138 (s) |
WG28 |
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90.00-140.0 |
73.8 |
0.0800 |
0.0400 |
| WR7 |
RG136 (s) |
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110.0-170.0 |
90.8 |
0.0650 |
0.0325 |
| WR4 |
RG137 |
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170.0-260.0 |
137 |
0.0430 |
0.0215 |
| WR3 |
RG139 (s) |
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220.0-325.0 |
174 |
0.0340 |
0.0170 |
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* Per standard manufacturer's specifications ** Cutoff frequencies calculated per
standard rectangular waveguide equation.
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Double-Ridge Waveguide
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| Double-ridge waveguide provides a wider operational bandwidth at the cost of higher insertion loss and lower
power handling. The "D" in WRD stands for double-ridge. D24 at the end means a bandwidth ration of 1.24:1, etc.
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| WRD250 |
- |
2.60-7.80 |
2.093 |
1.655 |
0.715 |
| WRD350 D24 |
4-029 (a) 4-303 (b) 4-031 (c) |
3.50-8.20 |
2.915 |
1.480 |
0.688 |
| WRD475 D24 |
4-033 (a) 4-034 (b) 4-035 (c) |
4.75-11.0 |
3.961 |
1.090 |
0.506 |
| WRD500 D36 |
2-025 (a) 2-026 (b) 2-027 (c) |
5.00-18.00 |
4.222 |
0.752 |
0.323 |
| WRD650 |
- |
6.50-18.00 |
5.348 |
0.721 |
0.321 |
| WRD750 D24 |
4-037 (a) 4-038 (b) 4-039 (c) |
7.50-18.00 |
6.239 |
0.691 |
0.321 |
| WRD110 D24 |
4-041 (a) 4-042 (b) 4-043 (c) |
11.00-26.50 |
9.363 |
0.471 |
0.219 |
| WRD180 D24 |
4-045 (a) 4-046 (b) 4-047 (c) |
18.00-40.00 |
14.995 |
0.288 |
0.134 |
Waveguide Flanges
Contact Grooved |
CPR |
CMR |
 CAR |
UDR |
UER |
Square Cover |
Round Cover |
CPR Grooved |
UBR |
UAR |
PDR |
Choke |
Square Cover Grooved |
Round Cover Grooved |
CBR |
PBR |
PAR |
Flange Style Designations
Related Pages on RF Cafe
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