Waveguide size
Published WFA models span WR770, WR650, WR510, WR430, WR340, WR284, WR229, WR187, WR159, WR137, WR112, WR90, WR75, WR62, WR51, WR42, WR34, WR28, WR22, WR19, WR15, WR12 and WR10.
Waveguide Fixed Attenuator
Waveguide fixed attenuators are essential components in microwave systems, designed to reduce signal power uniformly without affecting its waveform. They provide precise attenuation for signal control in various applications, including telecommunications, radar systems, and electronic testing, ensuring optimal system performance and reliability.
Dolph Microwave WFA series fixed attenuators provide defined signal reduction for standard rectangular waveguide systems from 0.96 to 112 GHz. Published models offer a maximum VSWR of 1.15:1, attenuation values from 3 to 40 dB, ±1.0 dB frequency response, model-dependent 100 to 3000 W CW power handling, aluminum or copper construction, and cover or grooved flange configurations. Broader WR2300-to-WR10, choke-flange and customized mechanical configurations are available subject to engineering review.
Published WFA Product Range
Fixed signal reduction matched to the selected waveguide band
A waveguide fixed attenuator introduces a specified amount of attenuation into the transmission path without requiring field adjustment. It is used where the required signal reduction is known in advance and must remain mechanically stable after installation.
Published WFA models cover 0.96–112 GHz and WR770–WR10. The broader product-family description also identifies WR2300–WR10 availability, including fixed, variable, cover, grooved and choke-flange configurations. Requirements outside the published WFA matrix should be reviewed as a custom or related attenuator configuration.
0.96–112
GHz
Frequency coverage in the published online WFA matrix.
WR770–WR10
Published models
Broader WR2300–WR10 family configurations are subject to confirmation.
3–40 dB
Attenuation
Commonly referenced values include 10, 20, 30 and 40 dB.
1.15:1
Maximum VSWR
Published online value; approved model documentation governs.
Electrical & Mechanical Options
Configuration points that define the finished attenuator
Frequency band alone is not sufficient for model selection. Attenuation value, CW power, flange pair, material, finish and mechanical envelope should be specified together.
Attenuation value
The online matrix lists 3–40 dB. The general product description highlights 10, 20, 30 and 40 dB as common selections, while the brochure reference table lists 3–30 dB.
CW power handling
Published values range from 100 to 3000 W CW depending on waveguide size and model. The final rating must be confirmed together with attenuation, duty conditions, cooling and installation environment.
Body material
The published table uses aluminum for WR770 through WR28 models and copper for WR22 through WR10 models. Alternative materials should be treated as an engineered option.
Flange interfaces
Cover and grooved flange designations are included in the model table. The wider family description also lists choke flanges. Each end can be specified separately where a mixed flange pair is required.
Standard or customized
Standard configurations can be selected from the published matrix. Custom mechanical layouts, finishes, paint colors and related attenuation configurations can be reviewed against the required system interface.
Application Scope
Where fixed attenuation is normally selected
Fixed attenuation is appropriate when the required signal reduction is established during system design and does not need continuous adjustment during operation.
Need field adjustment? Read about variable attenuators →
01
Telecommunications
Establishing a defined signal level in microwave communication links and transmission paths.
02
Radar systems
Reducing a known signal level before a receiver, monitoring branch or other system stage.
03
Electronic testing
Creating repeatable attenuation conditions for component, subsystem and laboratory evaluations.
04
Satellite communications
Managing signal levels within waveguide feed, ground-station and associated RF transmission assemblies.
05
Research and development
Providing a stable attenuation element for prototypes, experimental benches and characterized test paths.
Published Online Model Matrix
Standard WFA models and configuration references
Power values are displayed as W CW. Final electrical performance, dimensions, attenuation tolerance and power rating must be confirmed on the approved quotation and model drawing.
| Model | Frequency Range | WG Size | VSWR Max. | Attenuation | Frequency Response | Published CW Power | Cover Flange | Grooved Flange | Material | Finish | Files |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DH-12WFA… | 0.96–1.46 GHz | WR770 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR12 | PDR12 | Al | Chromate / Painted | Request DWG / STEP |
| DH-14WFA… | 1.13–1.73 GHz | WR650 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR14 | PDR14 | Al | Chromate / Painted | Request DWG / STEP |
| DH-18WFA… | 1.45–2.20 GHz | WR510 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR18 | PDR18 | Al | Chromate / Painted | Request DWG / STEP |
| DH-22WFA… | 1.72–2.61 GHz | WR430 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR22 | PDR22 | Al | Chromate / Painted | Request DWG / STEP |
| DH-26WFA… | 2.17–3.30 GHz | WR340 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR26 | PDR26 | Al | Chromate / Painted | Request DWG / STEP |
| DH-32WFA… | 2.60–3.95 GHz | WR284 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR32 | PDR32 | Al | Chromate / Painted | Request DWG / STEP |
| DH-40WFA… | 3.22–4.90 GHz | WR229 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR40 | PDR40 | Al | Chromate / Painted | Request DWG / STEP |
| DH-48WFA… | 3.94–5.99 GHz | WR187 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–3000 W CW | UDR48 | PDR48* | Al | Chromate / Painted | Request DWG / STEP |
| DH-58WFA… | 4.64–7.05 GHz | WR159 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–2000 W CW | UDR58 | PDR58 | Al | Chromate / Painted | Request DWG / STEP |
| DH-70WFA… | 5.38–8.17 GHz | WR137 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–2000 W CW | UDR70 | PDR70 | Al | Chromate / Painted | Request DWG / STEP |
| DH-84WFA… | 6.57–9.99 GHz | WR112 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–2000 W CW | UDR84 / UBR84 | PDR84 / PBR84 | Al | Chromate / Painted | Request DWG / STEP |
| DH-100WFA… | 8.20–12.50 GHz | WR90 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–2000 W CW | UDR100 / UBR100 | PDR100 / PBR100 | Al | Chromate / Painted | Request DWG / STEP |
| DH-120WFA… | 9.84–15.00 GHz | WR75* | 1.15:1 | 3–40 dB | ±1.0 dB | 100–1000 W CW | UDR120 / UBR120* | PDR120 / PBR120* | Al | Chromate / Painted | Request DWG / STEP |
| DH-140WFA… | 11.90–18.00 GHz | WR62 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–1000 W CW | UBR140 | PBR140 | Al | Chromate / Painted | Request DWG / STEP |
| DH-180WFA… | 14.50–22.00 GHz | WR51 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–1000 W CW | UBR180 | PBR180 | Al | Chromate / Painted | Request DWG / STEP |
| DH-220WFA… | 17.60–26.70 GHz | WR42 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–1000 W CW | UBR220 | PBR220 | Al | Chromate / Painted | Request DWG / STEP |
| DH-260WFA… | 21.70–33.00 GHz | WR34 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | UBR260 | PBR260 | Al | Chromate / Painted | Request DWG / STEP |
| DH-320WFA… | 26.30–40.00 GHz | WR28 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | UBR320 | PBR320 | Al | Chromate / Painted | Request DWG / STEP |
| DH-400WFA… | 32.90–50.10 GHz | WR22 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | FUGP400 / UG-383/U-M | — | Cu | Chromate / Painted | Request DWG / STEP |
| DH-500WFA… | 39.20–59.60 GHz | WR19 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | FUGP500 / UG-383/U-M | — | Cu | Chromate / Painted | Request DWG / STEP |
| DH-620WFA… | 49.80–75.80 GHz | WR15 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | FUGP620 / UG-385/U-M | — | Cu | Chromate / Painted | Request DWG / STEP |
| DH-740WFA… | 60.50–91.90 GHz | WR12 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | FUGP740 / UG-387/U-M | — | Cu | Chromate / Painted | Request DWG / STEP |
| DH-900WFA… | 73.80–112.00 GHz | WR10 | 1.15:1 | 3–40 dB | ±1.0 dB | 100–500 W CW | FUGP900 / UG-387/U-M | — | Cu | Chromate / Painted | Request DWG / STEP |
1
DH-120 model reference
The brochure identifies code 120 as WR75. Confirm the final approved drawing and flange designation.
2
WR187 flange reference
PDR48 is presented as the consistent grooved-flange designation. The approved drawing governs.
3
Power-unit clarification
Values are presented as W CW to align with the product part-number example and model-level power ranges.
Part Number Guide
DH-100WFA30PMA100
This example identifies the waveguide size, attenuator family, nominal attenuation, two flange ends, material and CW power rating.
DH100WFA30PMA100
DH
Dolph Microwave product prefix
100
Waveguide size code — WR90
WFA
Waveguide fixed attenuator
30
Nominal attenuation — 30 dB
P
First flange — rectangular cover / flat
M
Second flange — rectangular grooved
A / C
Material code — aluminum or copper
100
Power rating — 100 W CW
Flanges, Materials & Surface Treatment
Mechanical interfaces must match both connected waveguide sections
EIA and IEC flange references
Dolph Microwave publishes flange-designation information covering cover, grooved and choke variants across multiple WR sizes.
Open flange designation PDF →Aluminum and copper bodies
Current WFA listings use aluminum in the lower and mid-band models and copper in the WR22-to-WR10 models.
Read the waveguide material guide →Corrosion protection and paint
Published product information references corrosion-protection treatment, black painted exterior finishes and alternative finishing options subject to confirmation.
Engineering Support
Manufacturing and measurement capabilities published by Dolph Microwave
Manufacturing
• CNC machining
• Lathes and turning facilities
• Waveguide forming and bending
• Anodising and passivation
• Abrasive machining and diamond grinding
• Electrolytic and electroless plating
• Soldering and brazing
• Electroforming
Measurement and verification
• RF vector and scalar measurement systems
• Antenna anechoic chambers
• High-power transmitters
• Waveguide calibration service
• EMI and EMS testing
• Environmental testing
• Temperature and altitude testing
• Salt-fog and humidity testing
Quality Information
Documented company, quality-system and warranty information
Company background
Dolph Microwave states that it supplies microwave devices, waveguide components, feed systems and related assemblies.
About Dolph Microwave →ISO 9001 documentation
The company website provides an ISO 9001:2015 certificate covering the design, manufacture and sale of waveguide components.
View ISO certificate →Warranty terms
Warranty coverage, remedies and exclusions are governed by the formal quotation and published terms and conditions.
Read terms and conditions →Selection Checklist
Information to include with your RFQ
Providing complete operating and mechanical requirements reduces the risk of selecting the correct band but the wrong power, flange or installation configuration.
01Operating frequencyMinimum, maximum and required bandwidth.
02Waveguide designationWR size, IEC size or mating component details.
03Required attenuationNominal dB value and acceptable response.
04RF power conditionsCW power, peak power, duty cycle and ambient.
05Flange at each endCover, grooved or choke designation.
06Mechanical envelopeLength, orientation, mounting and clearance.
07Material and finishAluminum or copper, color and treatment.
08Required documentationDWG, STEP, test data and inspection records.
Related Engineering Resources
Continue configuring the complete waveguide path
Related product
High Power Fixed Attenuator
Review the separate high-power attenuator family where the standard WFA range is not suitable.
System integration
Straight Waveguide Sections
Match adjoining waveguide size, flange combination, material, finish and installation length.
Power monitoring
Crossguide Directional Couplers
Add a sampling interface where power monitoring or feedback is required alongside attenuation.
Termination
Waveguide Loads & Terminations
Review load and termination configurations for absorbing power at the end of a waveguide path.
Measurement
Precision Waveguide Calibration Kits
Prepare a waveguide VNA measurement path for component verification and characterization.
Reference
Waveguide Flange Standard EIA & IEC
Check flange families and interface designations before confirming a mixed waveguide assembly.
Frequently Asked Questions
Technical points to confirm before ordering
What is the difference between a fixed and variable waveguide attenuator?
A fixed attenuator provides a predetermined attenuation value and does not require adjustment after installation. A variable attenuator is selected when the signal level must be changed during calibration, setup or operation.
Does the standard WFA table cover WR2300 to WR10?
The general product-family description states WR2300 to WR10. The currently published detailed WFA model table begins at WR770 and extends to WR10. WR2300 through WR975 requirements should be submitted for configuration confirmation.
Are 10, 20, 30 and 40 dB the only available attenuation values?
They are highlighted as common values. The online matrix states a 3–40 dB range, while the downloadable brochure states 3–30 dB. State the exact required attenuation and allowable frequency response so the applicable model can be confirmed.
Can the two attenuator flanges be different?
The part-number example uses separate positions for the first and second flange, allowing the flange at each end to be identified independently. Provide the complete mating-flange designation for both ports.
How should I interpret the power values in the model table?
The values are presented here as watts CW. Do not select a model from the range alone; attenuation, frequency, ambient conditions and thermal installation must be reviewed together.
Can DWG, STEP and test information be supplied?
The product matrix references DWG and STEP documentation. Include the required drawing format, test data, inspection records and operating conditions with the RFQ so the deliverables can be confirmed before order placement.
Which specification takes priority when the website and brochure differ?
Use the model-specific quotation, approved drawing and agreed technical documentation as the controlling specification. General catalog and website values should be treated as selection references.
