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MECA Electronics Attenuators

Waveguide & Flange Selection Guide

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 fields - RF Cafe
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.
Waveguide equation formula drawing fields - RF Cafe
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.

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)  0.75-1.120.6059.7504.875
WR770RG205 (a)  0.96-1.450.7667.7003.850
WR650RG69 (b)
RG103 (a)
WG6 1.12-1.700.9086.5003.250
WR510   1.45-2.201.1575.1002.550
WR430RG104 (b)
RG105 (a)
WG8 1.70-2.601.3724.3002.150
WR340 RG112 (b)
RG113 (a)
WG9A 2.20-3.301.7363.4001.700
WR284RG48 (b)
RG75 (a)
WG10 2.60-3.952.0782.8401.340
WR229 RG340 (c)
RG341 (a)
WG11AR403.30-4.902.5772.2901.145
WR187RG49 (b)
RG95 (a)
WG12R483.95-5.85-3.1521.8720.872
WR159 RG343 (c)
RG344 (a)
WG13R584.90-7.053.7121.5900.795
WR137RG50 (b)
RG106 (a)
WG14R705.850-8.2004.3011.3720.622
WR112RG51 (b)
RG68 (a)
WG15R847.050-10.0005.2601.1220.497
WR90RG52 (b)
RG67 (a)
WG16R1008.20-12.406.560.9000.400
WR75 RG346 (c)
RG347 (a)
WG17 10.0-15.07.870.7500.375
WR62RG91 (b)
RG349 (a)
WG18 12.40-18.009.490.6220.311
WR51 RG352 (c)
RG351 (a)
WG19 15.00-22.0011.60.5100.255
WR42RG53 (b)
RG121 (a)
WG20 18.00-26.514.10.4200.170
WR34RG354 (c)  20.0-33.017.40.3400.170
WR28RG96 (s)
RG271 (c)
WG22 26.50-40.0021.10.2800.140
WR22RG97 (s)WG23 33.00-50.0026.40.2240.112
WR19 WG24 40.00-60.0031.40.1880.0940
WR15RG98 (s)WG25 50.00-75.0039.90.1480.0740
WR12RG99 (s)WG26 60.00-90.0048.40.1220.0610
WR10 WG27 75.00-110.059.00.1000.0500
WR8RG138 (s)WG28 90.00-140.073.80.08000.0400
WR7RG136 (s)  110.0-170.090.80.06500.0325
WR4RG137  170.0-260.01370.04300.0215
WR3RG139 (s)  220.0-325.01740.03400.0170

  * Per standard manufacturer's specifications
** Cutoff frequencies calculated per standard rectangular waveguide equation.

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

Waveguide Flanges

North American Waveguide Flange ShapesIEC Waveguide Flange Shapes
Contact Grooved Waveguide - RF Cafe
Contact Grooved
CPR Waveguide - RF Cafe
CPR
CMR Waveguide - RF Cafe
CMR
CAR Waveguide - RF Cafe
CAR
UDR Waveguide - RF Cafe
UDR
UER Waveguide - RF Cafe
UER
Square Cover Waveguide - RF Cafe
Square Cover
Round Cover Waveguide - RF Cafe
Round Cover
CPR Grooved Waveguide - RF Cafe
CPR Grooved
UBR Waveguide - RF Cafe
UBR
UAR Waveguide - RF Cafe
UAR
PDR Waveguide - RF Cafe
PDR
Choke Waveguide - RF Cafe
Choke
Square Cover Groved Waveguide - RF Cafe
Square Cover
 Grooved
Round Cover Grooved Waveguide - RF Cafe
Round Cover
Grooved
CBR Waveguide - RF Cafe
CBR
PBR Waveguide - RF Cafe
PBR
PAR Waveguide - RF Cafe
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.

Related Pages on RF Cafe

- Properties of Modes in a Rectangular Waveguide
- Properties of Modes in a Circular Waveguide
- Waveguide & Flange Selection Guide
- Rectangular & Circular Waveguide: Equations & Fields
- Rectangular waveguide TE1,0 cutoff frequency calculator.
- Waveguide Component Vendors
- NEETS - Waveguide Theory and Application
- EWHBK, Microwave Waveguide and Coaxial Cable

Windfreak Technologies
vidaRF RF & Microwave Components - RF Cafe
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