Broadband WRD Coverage
Standard families span WRD840 through WRD180, covering published operating ranges from 0.84 GHz to 40 GHz.
Double Ridge Waveguide Loop Coupler
Dolph Microwave’s Double-Ridge Waveguide Loop Couplers deliver precision performance across 0.84–40 GHz, optimized for high-power RF systems like radar, 5G, and satellite communications. Engineered with WRD-series waveguides, these couplers feature 20–60 dB coupling (±1.5 dB accuracy), 1.15:1 VSWR, and 12–15 dB directivity. Available with N-Type, SMA, or 2.92mm connectors and corrosion-resistant aluminum/copper construction, they ensure reliability in demanding environments. Customizable flange types (flat/grooved) and Surtec-treated finishes meet MIL-STD standards.
Double-Ridge Waveguide Coupler
Broadband Signal Sampling for High-Power RF and Microwave Systems
Dolph Microwave’s Double-Ridge Waveguide Loop Couplers are precision-engineered components designed for high-power RF and microwave systems, operating across full waveguide frequency bands from 0.84 GHz to 40 GHz. Utilizing a robust double-ridge waveguide architecture, these couplers provide low-reflection performance with VSWR ≤1.15:1 and precise coupling values ranging from 20 dB to 60 dB, with consistent directivity of 12–15 dB. Ideal for applications demanding high power handling and wideband performance, they are available in WRD-series waveguide sizes, including WRD840 for 0.84–2.0 GHz and WRD180 for 18–40 GHz, and support coaxial interfaces such as N-Type, SMA, or 2.92 mm connectors.
Frequency Coverage
0.84–40.0 GHz
VSWR
≤1.15:1
Coupling Range
20–60 dB
Directivity
12–15 dB
Performance and Construction
Key Features
Designed for broadband signal sampling in high-power RF systems, the range combines selectable coupling, directional monitoring and durable WRD interfaces.
Single or Dual Directional Sampling
Single-directional and dual-directional formats support forward-power, reflected-power or two-direction monitoring.
Selectable Coupling and Coaxial Output
Published coupling values range from 20 dB to 60 dB, with N-Type, SMA or 2.92 mm female outputs selected according to the model range.
Material, Flange and Finish Options
Aluminum or copper construction is available with cover and grooved flange combinations, Surtec corrosion protection and chromate or painted finishes.
Operating Principle
How a Waveguide Loop Coupler Is Used
A loop coupler samples a controlled portion of the electromagnetic energy traveling through the main double-ridge waveguide path. The sampled signal is routed to a coaxial output without requiring the primary high-power signal to be connected directly to lower-power measurement equipment.
Forward-Power Monitoring
The coupling port can provide a reduced-level representation of transmitted power for system supervision, calibration, control loops or protection circuits.
- Power-amplifier and transmitter monitoring.
- Closed-loop process control.
- Test and verification signal access.
Reflected-Power Monitoring
A directional or dual-directional arrangement can be configured to sample reflected energy and support load-condition or mismatch monitoring.
- Antenna or load mismatch detection.
- Protection of sensitive RF sources.
- Commissioning and maintenance diagnostics.
01
Select the WRD Band
Match the coupler to the complete operating frequency range and the existing double-ridge waveguide size.
02
Define the Sample Level
Choose the coupling value according to main-line power, instrument input range and required measurement margin.
03
Confirm Direction and Interface
Specify forward, reverse or dual-direction sampling, along with coupling connector, flange arrangement and orientation.
Typical Uses
Applications
Double-ridge loop couplers provide reduced-level signal access for monitoring, measurement and protection functions in broadband RF and microwave systems.
- Radar and Electronic SystemsSample forward or reflected RF power in radar transmitters, subsystem assemblies and electronic test platforms.
- Satellite CommunicationsProvide monitoring points within broadband ground-station, antenna-feed, uplink and downlink equipment.
- Broadband RF and Millimeter-Wave TestSupport characterization, calibration and signal monitoring across research, validation and production-test systems.
- Industrial Microwave SystemsMonitor delivered and reflected power in heating, drying, plasma, materials-processing and process-control equipment.
Engineering Options
Customization & Support
Dolph Microwave can review custom coupling values, flange designs, connector arrangements, materials and finishes against the required operating band and system interface.
Coupling Configuration
Specify coupling level, tolerance, forward or reverse sampling direction, single or dual outputs and required directivity.
Mechanical Interface
Choose the WRD size, cover and grooved flange combination, connector orientation and available mounting clearance. Pressure-sealed construction can be evaluated when supported by project requirements and engineering review.
Material and Finish
Define aluminum or copper construction, Surtec or chromate treatment, paint color, environmental exposure and flange-face requirements.
Standard Model Range
Double-Ridge Waveguide Loop Coupler Specifications
The table retains the original published model range, waveguide interfaces, coupling outputs, materials and finish information.
| Model | Freq. Range (GHz) |
WG Size | VSWR | Coupling (dB) |
Directivity (dB) |
Coupling Output | Flange Type | Material | Finish | Datasheet | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cover | Grooved | DWG | STEP | |||||||||
| DH-840DRWHC30… | 0.84–2.0 | WRD840 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD840U24 | FMWRD840U24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-150DRWHC30… | 1.5–3.6 | WRD150 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD150D24 | FMWRD150D24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-200DRWHC30… | 2.0–4.8 | WRD200 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD200D24 | FMWRD200D24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-250DRWHC30… | 2.6–7.8 | WRD250 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD250D30 | FMWRD250D30 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-350DRWHC30… | 3.5–8.2 | WRD350 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD350D24 | FMWRD350D24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-475DRWHC30… | 4.75–11.0 | WRD475 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD475D24 | FMWRD475D24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-500DRWHC30… | 5.0–18.0 | WRD500 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD500D36 | FMWRD500D36 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-580DRWHC30… | 5.8–16.0 | WRD580 | 1.15:1 | 20–60 | 12–15 | N-K | FPWRD580D28 | FMWRD580D28 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-650DRWHC30… | 6.5–18.0 | WRD650 | 1.15:1 | 20–60 | 12–15 | SMA-K | FPWRD650D28 | FMWRD650D28 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-700DRWHC30… | 7.0–18.5 | WRD700 | 1.15:1 | 20–60 | 12–15 | SMA-K | FPWRD700D26 | FMWRD700D26 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-750DRWHC30… | 7.5–18.0 | WRD750 | 1.15:1 | 20–60 | 12–15 | SMA-K | FPWRD750D24 | FMWRD750D24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-110DRWHC30… | 11.0–26.5 | WRD110 | 1.15:1 | 20–60 | 12–15 | 2.92-K | FPWRD110C24 | FMWRD110C24 | Al/Cu | Chromate/Painted | DWG | STEP |
| DH-180DRWHC30… | 18.0–40.0 | WRD180 | 1.15:1 | 20–60 | 12–15 | 2.92-K | FPWRD180C24 | FMWRD180C24 | Al/Cu | Chromate/Painted | DWG | STEP |
Selection note: The coupling and directivity values shown are product-family data. Confirm coupling tolerance, full-band directivity, insertion loss, power handling and test conditions in the model-specific quotation or approved datasheet.
Ordering Logic
Part Number Guide
The example below shows how waveguide size, directionality, coupling, connector, flange and material are encoded. Confirm the final code in the approved quotation.
DH-840DRWHC30NKPMA- 840DRWaveguide size: WRD840
- WHCSingle directional loop coupler
- WDHCDual directional loop coupler
- 30Coupling: 30 dB
- NCoupling connector: N-Type
- KInterface type: Female
- PFlange type: Rectangular flat
- MFlange type: Rectangular grooved
- A / CMaterial: Aluminum / Copper
Surface Protection
Finish and Corrosion-Protection Note
All Dolph-MW models include a Surtec/corrosion-protection treatment and are painted flat black. Flanges are unplated, polished and Surtec treated. Other finishes and paint colors are available upon request.
Specification-Based Quotation
Information to Include in a Coupler RFQ
Complete inputs are required to verify the coupling port, waveguide interfaces, sampling direction and performance across the intended operating band.
Request Technical Review- Frequency RangeMinimum and maximum operating frequencies, including any restricted sub-bands.
- Waveguide SizeRequired WRD series and mating component details.
- Coupling ValueNominal dB value, acceptable tolerance and frequency flatness.
- DirectionalitySingle or dual directional arrangement and required sampling orientation.
- Main-Line PowerAverage power, peak power, duty cycle and pulse conditions.
- Coaxial OutputN-Type, SMA, 2.92 mm or another interface, including gender and orientation.
- Flange ArrangementCover/grooved combination, flange codes, clocking and mounting constraints.
- EnvironmentTemperature, corrosion exposure, vibration, sealing requirements, finish and documentation.
Technical Documents
Downloads
Use the available technical files for related product and flange-reference information.
