Rectangular to Rectangular
Adjacent or non-adjacent WR sizes, with flat or grooved flange combinations and model-dependent lengths.
View standard transitionsCustom Waveguide Transition Manufacturer
Dolph Microwave manufactures rectangular, circular, double-ridge and special waveguide transitions around your two port interfaces, operating band, flange geometry, length limit, material and test requirement.
Send a drawing, STEP file or clear sketch. Final RF performance, dimensions and documents are confirmed against the selected interfaces and approved production drawing.
0.35–91.9 GHzStandard transition catalog
WR2300–WR12Published standard coverage
From 1.05:1Selected catalog VSWR
Up to 1000 mmPublished transition length
Transition Families
Match the actual port pair, not only the waveguide band.
The quotation identifies both waveguide sections, both flange faces, the common operating band and the required mechanical envelope.
Rectangular to Circular
Published models cover R14 to R900 interfaces, circular inside diameters and lengths from 20 to 920 mm.
View rectangular-to-circularDouble-Ridge to Rectangular
Published configurations cover 2.6 to 40 GHz with model-dependent shared bands and 50 to 180 mm lengths.
View ridge-to-rectangularDouble-Ridge to Double-Ridge
Published families cover model-dependent WRD interfaces from 3.5 to 18 GHz, with typical VSWR up to 1.15:1.
View double-ridge transitionsSpecial Interface Transition
Use for mixed sizes, shapes, custom flange geometry, unusual clocking or a transition built into a larger assembly.
View special transitions
Custom Configuration
Control the RF path and the installation fit in one drawing.
Specify the actual mating parts and the available space. Dolph can review a stand-alone transition or combine the transition with bends, twists, straight sections, flexible sections or end flanges.
Both port interfacesWaveguide section, flange code, mating face and hole pattern
Common operating bandMinimum and maximum frequency used by the complete assembly
Electrical acceptanceVSWR, return loss, insertion loss and test points
Length and clockingOverall envelope, flange rotation, bend plane and mounting access
Material and finishAluminum, copper or brass options, coating and plating needs
Power and environmentAverage power, peak power, cooling, pressurization and exposure
Required filesPDF drawing, DWG, STEP and agreed inspection or RF records
Quantity and schedulePrototype quantity, production quantity and required delivery date
Two port drawings and one operating band are enough to start the review.
Add power, envelope, finish, quantity and document requirements when available.
Published Reference Data
Use the published ranges for initial selection, then confirm the final model.
| Transition family | Published frequency | Published interface scope | Published VSWR reference | Published length reference | Published materials | Product data |
|---|---|---|---|---|---|---|
| Standard rectangular transition | 0.35–91.9 GHz | WR2300–WR12 catalog coverage | Selected entries 1.05:1 | 50–1000 mm by listed models | Aluminum and copper | Model table |
| Special waveguide transition | 0.35–91.9 GHz | Mixed size, shape or interface type | Published ≤1.04:1 in overlap bands | Defined by project | Aluminum 6061 or brass | Family data |
| Rectangular to circular | 1.30–112 GHz in listed models | R14–R900 with listed circular I.D. | ≤1.10:1 or ≤1.15:1 by model | 20–920 mm | Aluminum or copper | Model table |
| Double-ridge to rectangular | 2.6–40 GHz | WRD, UDR and UBR combinations | 1.06:1–1.15:1 by configuration | 50–180 mm examples | Aluminum | Family data |
| Double-ridge transition | 3.5–18 GHz | Model-dependent WRD families | Typical ≤1.15:1 | Confirm by model | Aluminum; custom options listed | Model data |
Published values are family or model references. The quotation and approved drawing define the final operating band, interfaces, dimensions, finish, test method and acceptance limits.
Materials and Interfaces
Review EIA and IEC flange references
Specify the surfaces that affect fit, loss, corrosion and service conditions.
Published transition families list aluminum, copper, brass and oxygen-free copper depending on the product. Standard model notes list corrosion-protection treatment, flat-black paint and polished mating flanges. Other finishes and paint colors are available by request.
Base materialAluminum, copper, brass or oxygen-free copper by family and duty
Flange styleUG, CPRG, UBR, cover, grooved, choke or project-specific geometry
Surface finishChromate or Surtec treatment, paint and agreed flange treatment
Optional platingSilver or gold plating can be discussed for custom waveguide assemblies
Flange clockingDefine hole orientation and any fixed rotation between Port 1 and Port 2
Cooling or pressure featuresState air, water, gas, pressure-window or inlet needs at RFQ stage
Engineering and Production Flow
A clear approval path before production starts.
Prototype and production requirements are handled through the same interface, drawing and acceptance review.
Receive RFQ Data
Review both ports, operating band, electrical target, power, envelope, material, finish, quantity and required files.
Check Interface Fit
Confirm waveguide sections, flange standards, mating faces, clocking and usable overlap between the two ports.
Set Geometry
Define transition length, profile, bend or twist integration, mounting clearance and any cooling or pressure features.
Approve Documents
Align model designation, drawing, material, finish, tolerances, file package and RF acceptance limits before release.
Manufacture
Use the agreed mix of CNC machining, turning, forming, bending, brazing, assembly, passivation or plating.
Test and Deliver
Complete agreed dimensional and RF checks, compile the required records and prepare the order for shipment.
RFQ Checklist
Provide the details that change price, fit and RF performance.
A dimensioned drawing is preferred. A clear sketch can start the review when it identifies both interfaces and the available space.
Port 1 and Port 2Waveguide sizes, flange codes and mating-face drawings
Operating BandMinimum and maximum frequency used in service
RF AcceptanceVSWR, return loss, insertion loss and test frequencies
PowerAverage power, peak power, duty cycle and pulse data
Mechanical EnvelopeLength, nearby hardware, flange clocking and support points
Material and FinishBase metal, coating, plating and service environment
Document PackageApproval drawing, PDF, DWG, STEP and test records
Cooling or PressureAir, water, gas, inlet, pressure window or sealing needs
Commercial DataPrototype and production quantity, destination and required date
Manufacturing and Verification
Engineering, metal processing and RF verification from one supplier.
Dolph lists CNC machining, turning, waveguide forming and bending, brazing, assembly, passivation, plating and electroforming among its manufacturing capabilities.
CNC and Turning
Machined flange faces, transition bodies, circular interfaces and custom mounting geometry.
Forming and Bending
Rigid, preformed and multi-bend sections for assemblies that must follow a fixed equipment route.
Brazing and Assembly
Soldering and brazing support for copper, copper alloys and aluminum, including fully brazed custom assemblies.
Finish and Plating
Anodising, passivation, electrolytic and electroless plating, plus project-specific coating requirements.
RF Systems to 100 GHz
Dolph lists vector and scalar measurement systems up to 100 GHz for component verification work.
High-Power and Calibration Support
Published support capabilities include high-power transmitters and waveguide calibration services.
Anechoic and EMI/EMS
Dolph lists antenna anechoic chamber work and EMI/EMS testing among its measurement services.
Environmental Testing
Published services include temperature and altitude, salt fog, humidity and other environmental checks.
Related Waveguide Parts
Order the transition alone or review the complete waveguide route.
Link the transition to the surrounding sections so flange orientation, total length and assembly access are checked together.
Company and Quality Information
Founded in 2001
Published ISO 9001:2015 Certificate
Model and Drawing Data
One-Year Warranty
Check the published company, quality and warranty information before ordering.
Dolph describes its business as a microwave component and antenna feed-system manufacturer.
Company informationThe certificate scope covers waveguide component design, manufacture and sale. The document states validity through August 7, 2026; confirm current status before order.
Review certificatePublished product tables include model-level frequency, VSWR, dimensions, interfaces, material, finish and file references.
Review model tableThe website states a one-year warranty from delivery against defective material and workmanship under its terms.
Review warranty statement
Engineering References
Design
Custom Build
Installation
Power
Review design, installation and power details before release.
How to Design Waveguide Transitions Efficiently
Design considerations for impedance matching, mechanical connection and thermal conditions.
Read articleCustom Waveguide Assemblies: 5 Common Mistakes
Checks for measurement, flange selection, sealing, thermal expansion and mounting alignment.
Read articleWaveguide Installation Guide
Practical checks for flange surfaces, alignment, bolt tightening and post-installation VSWR testing.
Read articleWaveguide Power Handling
Points to confirm for continuous-wave power, peak power, breakdown limits and cooling.
Read article
Order FAQ
Questions to close before quotation and drawing approval.
Final values depend on the exact two-port combination and approved configuration.
Can you connect two different rectangular waveguide sizes?
Yes. Provide both waveguide and flange designations. The usable operating band must fit the overlap of the two interfaces and the agreed transition design.
Can the transition include a bend, twist or flexible section?
Yes. Dolph publishes custom assemblies that combine rigid sections, E-plane or H-plane bends, twists, flexible sections and end flanges.
Can you manufacture rectangular-to-circular transitions?
Yes. Published models cover R14 through R900 entries, with listed circular inside diameters, aluminum or copper construction and model-specific lengths.
Which files should we send?
Send a dimensioned PDF, DWG or STEP file when available. A clear sketch can start the review if it identifies both ports, clocking and space limits.
Can you provide drawings and test records?
State the required approval drawing, PDF, DWG, STEP, dimensional record and RF test record in the RFQ. The final document package is agreed in the quotation.
Which material and finish should we specify?
State the service environment, conductivity needs, weight limit, corrosion exposure and mating-flange treatment. Available choices depend on the transition family.
How should high-power requirements be submitted?
Provide average power, peak power, pulse width, duty cycle, pressure or gas condition and cooling requirements. Do not use frequency alone as the power specification.
Can you quote a drop-in replacement?
Yes. Send the existing drawing, sample dimensions, interface details, operating band, acceptance limits and any known installation problem.
Send the two interfaces. Receive a configuration-based quotation.
Include the operating band, electrical target, power, space limit, material, finish, document package, quantity and required date. Attach a drawing or sketch when available.