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Rectangular-To-Circular-Waveguide-Transition

Rectangular To Circular Waveguide Transition

A Rectangular to Circular Waveguide Transition is a specialized component used to seamlessly convert the mode of transmission between rectangular and circular waveguides. It ensures efficient signal transfer, minimizing reflections and losses, making it essential for diverse microwave and RF systems where waveguide interface changes are required.

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Standard & Custom Waveguide Transition

Dolph Microwave rectangular-to-circular waveguide transitions provide a controlled interface between rectangular and circular waveguide sections in microwave and RF transmission systems. The published standard series covers 1.30 to 112 GHz, with model-specific maximum VSWR of ≤1.10 or ≤1.15, rectangular interfaces from WR650 to WR10, and circular-waveguide inner diameters from 157 mm to 2.388 mm. Aluminum and copper configurations are listed, with chromate treatment and painted finish. Custom waveguide size, length, flange, material, cooling and mechanical arrangements can be reviewed according to the application.

Product Overview

Controlled Interface Between Rectangular and Circular Waveguides

This transition is used where a microwave assembly must change from a rectangular waveguide interface to a circular waveguide section. Its gradual geometry provides the mechanical interface and mode-conversion structure needed to reduce the reflection associated with an abrupt change in cross-section.

The final operating band, circular-waveguide mode, polarization arrangement, flange configuration and power capability should be confirmed for the complete system. The listed frequency range represents the model-specific operating range of the assembled transition.

Rectangular Interface IEC R / EIA WR designation
Circular Interface Specified internal diameter
Product Range

Published Models and Broader Custom Capability

STANDARD CATALOG SERIES 22 listed models
Frequency 1.30–112 GHz
Rectangular WG WR650–WR10
VSWR Max. ≤1.10 / ≤1.15
Length 20–920 mm
Circular I.D. 157–2.388 mm
GENERAL CUSTOM CAPABILITY Project-specific configuration
Waveguide size WR2300–WR10
Average power 100–6000 W CW or higher
Cooling Air / water
Material Aluminum / copper
Flanges Cover / grooved / choke

Power handling and cooling requirements are not assigned individually in the current standard-model table. Confirm the required CW or peak power, duty cycle, operating frequency, environment and cooling arrangement when requesting a quotation.

Key Features

Configuration Options for Waveguide System Integration

Broad Size Coverage

Standard models span WR650 to WR10, while broader project configurations are stated from WR2300 to WR10.

High-Power Options

General capability is stated from 100 to 6000 watts CW or higher, subject to the selected design and operating conditions.

Air or Water Cooling

Cooling can be reviewed for applications where thermal dissipation must be addressed at the transition assembly.

Aluminum or Copper

The published series lists aluminum for WR650 through WR28 models and copper for WR22 through WR10 models.

Multiple Flange Families

Cover, grooved and choke arrangements are available with round, square, CPRF, CPRG and FUGP designations by waveguide size.

Selection Guide

Information Required for Model Selection

1
Operating frequency

Provide the full operating range rather than only the center frequency. The selected transition must cover the overlapping usable band of both interfaces.

2
Rectangular waveguide designation

Specify the EIA WR designation, IEC R designation, internal dimensions or an existing mating-component drawing.

3
Circular-waveguide interface

Confirm the circular-waveguide internal diameter, flange details, required mode and polarization relationship within the complete system.

4
RF performance requirements

State the required maximum VSWR, insertion-loss requirement, bandwidth and any mode-purity or polarization criteria. Insertion loss is not listed in the current standard-model table.

5
Power and cooling

Provide CW power, peak power, pulse width, duty cycle and available cooling conditions so the thermal and electrical design can be reviewed.

6
Mechanical and documentation requirements

Specify transition length, flange faces, material, finish, paint color, mounting envelope, compliance documentation, test report and STEP-file requirements.

Engineering Notes

Important Points Before Ordering

A matching waveguide designation alone is not sufficient to define the complete transition. Frequency, circular diameter, mode, flange faces, length, power and system geometry should be reviewed together.

VSWR is model-specific Models up to DH-140RCA15.088 are listed at ≤1.10. DH-180RCA12.7 through DH-900RCA2.388 are listed at ≤1.15.
Power capability requires confirmation The 100–6000 W CW or higher statement is a general capability and should not be applied automatically to every catalog model.
Mode and polarization must be defined The current table identifies frequency, interface size and VSWR but does not specify the required circular-waveguide mode or polarization orientation.
Mechanical compatibility matters Confirm bolt pattern, gasket or O-ring arrangement, flange face, available installation length and adjacent-component clearance.
Standard Model Table

Rectangular-to-Circular Transition Specifications

22 standard model entries Scroll horizontally on mobile devices to view all columns.
Model Frequency
(GHz)		 VSWR
Max.		 Length
(mm)		 IEC WG EIA WG Circular WG I.D.
(mm)		 Material Finish RoHS & REACH Resources
DH-14RCA157 1.30-1.70≤1.10920R14WR650157AlChromate/PaintedComply PDF · STEP
DH-18RCA114.58 1.7-2.2002≤1.10820R18WR510114.58AlChromate/PaintedComply PDF · STEP
DH-22RCA97.87 2.07-2.61≤1.10580R22WR43097.87AlChromate/PaintedComply PDF · STEP
DH-26RCA83.62 2.42-3.30≤1.10500R26WR34083.62AlChromate/PaintedComply PDF · STEP
DH-32RCA71.42 2.83-3.88≤1.10420R32WR28471.42AlChromate/PaintedComply PDF · STEP
DH-40RCA51.99 3.22-4.90≤1.10350R40WR22951.99AlChromate/PaintedComply PDF · STEP
DH-48RCA44.45 3.94-5.33≤1.10300R48WR18744.45AlChromate/PaintedComply PDF · STEP
DH-58RCA38.1 5.3-7.05≤1.10230R58WR15938.1AlChromate/PaintedComply PDF · STEP
DH-70RCA32.537 6.21-8.17≤1.10200R70WR13732.537AlChromate/PaintedComply PDF · STEP
DH-84RCA27.788 7.30-9.97≤1.10200R84WR11227.788AlChromate/PaintedComply PDF · STEP
DH-100RCA23.825 8.50-11.6≤1.10160R100WR9023.825AlChromate/PaintedComply PDF · STEP
DH-120RCA17.415 11.6-15.0≤1.10130R120WR7517.415AlChromate/PaintedComply PDF · STEP
DH-140RCA15.088 13.4-18.0≤1.10100R140WR6215.088AlChromate/PaintedComply PDF · STEP
DH-180RCA12.7 15.9-21.8≤1.15100R180WR5112.7AlChromate/PaintedComply PDF · STEP
DH-220RCA9.525 21.2-26.7≤1.1560R220WR429.525AlChromate/PaintedComply PDF · STEP
DH-260RCA8.331 24.3-33.0≤1.1560R260WR348.331AlChromate/PaintedComply PDF · STEP
DH-320RCA7.137 31.8-40.0≤1.1550R320WR287.137AlChromate/PaintedComply PDF · STEP
DH-400RCA5.563 36.4-49.8≤1.1550R400WR225.563CuChromate/PaintedComply PDF · STEP
DH-500RCA4.369 46.3-59.6≤1.1540R500WR194.369CuChromate/PaintedComply PDF · STEP
DH-620RCA3.581 56.6-75.8≤1.1530R620WR153.581CuChromate/PaintedComply PDF · STEP
DH-740RCA3.175 63.5-87.2≤1.1530R740WR123.175CuChromate/PaintedComply PDF · STEP
DH-900RCA2.388 84.8-112≤1.1520R900WR102.388CuChromate/PaintedComply PDF · STEP

STEP links lead to the contact page so the required model-specific file can be confirmed. The consolidated product PDF is preserved in the download section below.

Part Number Guide

DH-100RCA23.825PMA160

The published example combines the rectangular waveguide size, transition type, circular-waveguide diameter, flange selections, material and overall length.

100 Waveguide size
WR90
RCA Rectangle-to-circular transition
23.825 Circular WG I.D.
Ø23.825 mm
P / M Flat flange
Grooved flange
A / C Aluminum
Copper
160 Overall length
160 mm
Published finish note

Dolph states that its models include Surtec/corrosion-protection treatment and are painted flat black. Flanges are described as unplated, polished and Surtec treated. Other finishes and paint colors are available upon request.

Flange Reference

IEC and EIA Flange Type Designations

Dolph Microwave publishes flange designations based on current IEC and EIA waveguide standards. Available flange families depend on the waveguide size and required mating face.

FAPRound cover
FAMRound grooved
FAERound choke
FBPSquare cover
FBMSquare grooved
FBESquare choke
FDPCPRF
FDMCPRG
FUGPFUGP designation
View flange designations for WR650 to WR10 +
EIA WG IEC WG Published Flange Designations
WR650R14FDP14, FDM14
WR510R18FDP18, FDM18
WR430R22FDP22, FDM22
WR340R26FDP26, FDM26
WR284R32FAP32, FAM32, FAE32, FDP32, FDM32
WR229R40FAP40, FAM40, FAE40, FDP40, FDM40
WR187R48FAP48, FAM48, FAE48, FDP48, FDM48
WR159R58FAP58, FAM58, FAE58, FDP58, FDM58
WR137R70FAP70, FAM70, FAE70, FDP70, FDM70
WR112R84FBP84, FBM84, FBE84, FDP84, FDM84
WR90R100FBP100, FBM100, FBE100, FDP100, FDM100
WR75R120FBP120, FBM120, FBE120, FDP120, FDM120
WR62R140FBP140, FBM140, FBE140, FDP140, FDM140
WR51R180FBP180, FBM180, FBE180, FDP180, FDM180
WR42R220FBP220, FBM220, FBE220
WR34R260FBP260, FBM260, FBE260
WR28R320FBP320, FBM320, FBE320
WR22R400FAP400, FAM400, FUGP400
WR19R500FAP500, FAM500, FUGP500
WR15R620FAP620, FAM620, FUGP620
WR12R740FAP740, FAM740, FUGP740
WR10R900FAP900, FAM900, FUGP900
Applications

Integration Across Microwave and RF Systems

1 Radar Systems

Interface conversion within transmitter, receiver, rotary-joint, antenna-feed and test assemblies.

2 Satellite Communications

Connection of rectangular waveguide chains to circular-waveguide antenna-feed and polarization components.

3 Telecommunications

Mechanical and electromagnetic integration of different waveguide geometries in microwave links.

4 Research & Testing

Laboratory fixtures and measurement setups requiring a defined transition between interfaces.

5 Aerospace & Defense

Custom microwave assemblies where installation envelope, mass, interface and RF performance must be coordinated.

Company Capabilities

Manufacturing, Measurement and Engineering Support

MANUFACTURING
  • •CNC machining, milling and turning
  • •Waveguide forming and bending
  • •Soldering and brazing of copper, copper alloys and aluminum
  • •Anodising, passivation and plating processes
  • •Abrasive machining, diamond grinding and electroforming
View manufacturing capabilities
MEASUREMENT & SUPPORT
  • •RF vector and scalar systems up to 100 GHz
  • •Antenna anechoic chambers and high-power transmitters
  • •Waveguide calibration service
  • •EMI and EMS testing
  • •Temperature, altitude, salt-fog and humidity testing capabilities
View research and support services
2001 Company founded
ISO 9001:2015 documentation
100 GHz Published RF measurement capability
1 Year Published product warranty

Company-level manufacturing and measurement capabilities do not mean that every listed transition automatically includes every test. Confirm the inspection scope, report format and acceptance criteria during quotation.

Technical Downloads

Product and Reference Documents

Rectangular-to-Circular Transition PDF Original product datasheet link retained. Flange Type Designations PDF Original IEC and EIA flange reference link retained. Published ISO 9001:2015 Certificate View the certificate and its stated certification scope and validity information.
Technical Reading

Waveguide Selection Resources

Frequently Asked Questions

Rectangular-to-Circular Transition FAQ

What is the difference between the catalog range and the WR2300-to-WR10 capability? +
The current rectangular-to-circular model table lists 22 standard products from WR650 to WR10. The broader WR2300-to-WR10 statement describes general customization capability and does not mean that every size is available as an identical standard catalog model.
How should I choose the correct model? +
Start with the required operating-frequency range, then match the rectangular waveguide designation and circular-waveguide internal diameter. Confirm VSWR, mode, polarization, flange faces, available length, material, power and cooling before final selection.
Does the published frequency range equal the full operating range of the rectangular waveguide? +
Not necessarily. The published value is the operating range of the complete transition and may be limited by the overlapping usable bands of the rectangular and circular interfaces.
Are insertion-loss values available? +
The current standard-model table publishes frequency and maximum VSWR but does not list insertion loss. Include the required insertion-loss limit and test conditions in the enquiry.
Can the transition be supplied with water cooling? +
Air- and water-cooling arrangements are listed as available options. The required solution depends on the selected size, frequency, CW or peak power, duty cycle and installation conditions.
Are PDF and STEP resources available? +
The consolidated product PDF and flange-designation PDF are available above. Request the model-specific STEP file by providing the exact model number and required flange arrangement.
What warranty is published for Dolph Microwave products? +
Dolph Microwave publishes a one-year warranty from the date of delivery against defective materials and workmanship, subject to the company’s published warranty terms.
Engineering Enquiry

Specify the Transition Around Your System Interfaces

Send the operating band, rectangular waveguide size, circular internal diameter, flange faces, power, cooling, material, length and required documentation for configuration review.

Discuss Your Requirement sales@dolphmicrowave.com

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DOLPH-MW WARRANTY

Dolph Microwave warrants our products to be free from defective material and workmanship for a period of one year from the date of delivery. All defective parts will be replaced and repair work required by normal use will be performed, without charge, within this one year period. This warranty shall be exclusive and in lieu of all other warranties expressed or implied.

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CONTACT DOLPH

FengHuiNan Road NO.34, High-Tech Zone, Xi an, China
Tel/Fax: (+86) 29-8881-0979
E-mail: Sales@dolphmicrowave.com

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