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Kirt Blattenberger - RF Cafe Webmaster

Copyright: 1996 - 2024

Webmaster:

    Kirt Blattenberger,

    BSEE - KB3UON

RF Cafe began life in 1996 as "RF Tools" in an AOL screen name web space totaling 2 MB. Its primary purpose was to provide me with ready access to commonly needed formulas and reference material while performing my work as an RF system and circuit design engineer. The World Wide Web (Internet) was largely an unknown entity at the time and bandwidth was a scarce commodity. Dial-up modems blazed along at 14.4 kbps while tying up your telephone line, and a nice lady's voice announced "You've Got Mail" when a new message arrived...

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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-Bend E-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)

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

  * 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)

WRD U.S. Mil.

MIL-W-23351-

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

North American Waveguide Flange Shapes IEC 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.

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