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.

H-BendE-Bend
Waveguide equation formula drawing fieldsAn H-Bend is bent in the Hard direction (along the long side). This is the direction of the H-field in the TE10 mode.Waveguide equation formula drawing fieldsAn E-Bend is bent in the Easy direction (along the short side). This is the direction of the E-field in the TE10 mode.
 
 Standard Rectangular Waveguide

Click here for handy free "ezGuide" waveguide selector software from Andrew.

 
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
WR975RG204 (a)  0.75-1.12 9.7504.875
WR770RG205 (a)  0.96-1.45 7.7003.850
WR650RG69 (b)
RG103 (a)
WG6 1.12-1.70 6.5003.250
WR510   1.45-2.20 5.1002.550
WR430RG104 (b)
RG105 (a)
WG8 1.70-2.60 4.3002.150
WR340 RG112 (b)
RG113 (a)
WG9A 2.20-3.30 3.4001.700
WR284RG48 (b)
RG75 (a)
WG10 2.60-3.952.082.8401.340
WR229 RG340 (c)
RG341 (a)
WG11AR403.30-4.902.5772.2901.145
WR187RG49 (b)
RG95 (a)
WG12R483.95-5.85-3.1561.8720.872
WR159 RG343 (c)
RG344 (a)
WG13R584.90-7.053.7051.5900.795
WR137RG50 (b)
RG106 (a)
WG14R705.850-8.2004.2851.3720.622
WR112RG51 (b)
RG68 (a)
WG15R847.050-10.0005.261.1220.497
WR90RG52 (b)
RG67 (a)
WG16R1008.20-12.406.560.9000.400
WR75 RG346 (c)
RG347 (a)
WG17 10.0-15.07.8470.7500.375
WR62RG91 (b)
RG349 (a)
WG18 12.40-18.009.490.6220.311
WR51 RG352 (c)
RG351 (a)
WG19 15.00-22.0011.540.5100.255
WR42RG53 (b)
RG121 (a)
WG20 18.00-26.514.080.4200.170
WR34RG354 (c)  20.0-33.017.280.3400.170
WR28RG96 (s)
RG271 (c)
WG22 26.50-40.0021.10.2800.140
WR22RG97 (s)WG23 33.00-50.00 0.2240.112
WR19 WG24 40.00-60.00 0.1880.094
WR15RG98 (s)WG25 50.00-75.00 0.1480.074
WR12RG99 (s)WG26 60.00-90.00 0.122.061
WR10 WG27 75.00-110.0 0.1000.050
WR8RG138 (s)WG28 90.00-140.0 0.0800.040
WR7RG136 (s)  110.0-170.0 0.0650.0325
WR4RG137  170.0-260.0 0.0430.0215
WR3RG139 (s)  220.0-325.0 0.03400.0170
 
 Double-Ridge Waveguide
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.
 
Designation
(a) = aluminum, (b) = brass, (c) = copper
fL - fU
(GHz)
fCO
(GHz)
Maximum
Inside
Width
(in)
Maximum
Inside
Height
(in)
WRDU.S. Mil.
MIL-W-23351-
WRD250-2.60-7.802.0931.6550.715
WRD350  D244-029 (a)
4-303 (b)
4-031 (c)
3.50-8.202.9151.4800.688
WRD475  D244-033 (a)
4-034 (b)
4-035 (c)
4.75-11.03.9611.0900.506
WRD500  D362-025 (a)
2-026 (b)
2-027 (c)
5.00-18.004.2220.7520.323
WRD650-6.50-18.005.3480.7210.321
WRD750  D244-037 (a)
4-038 (b)
4-039 (c)
7.50-18.006.2390.6910.321
WRD110  D244-041 (a)
4-042 (b)
4-043 (c)
11.00-26.509.3630.4710.219
WRD180  D244-045 (a)
4-046 (b)
4-047 (c)
18.00-40.0014.9950.2880.134
 
North American Waveguide Flange ShapesIEC Waveguide Flange Shapes

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

  • UG:   UG is the military standard MIL-DTL-3922 for a range of flange types.
  • CMR:   CMR flanges are the miniature version of the Connector Pressurized Rectangular
               (CPR) style flanges.
  • CPRG:   Connector Pressurized Rectangular (CPR) refers to a range of commercial
                  rectangular flanges. CPRG is Grooved CPR flange.
  • CPRF:   Connector Pressurized Rectangular (CPR) refers to a range of commercial
                  rectangular flanges. CPRF is flat CPR flange.
  • Cover or Plate:   Square, flat UG style flanges.
  • Choke:   UG style flanges with an o-ring groove and a choke cavity.