Full WRD Band Coverage
Standard model families cover double-ridge waveguide bands from WRD840 through WRD180, supporting broadband RF sampling 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
0.84–40.0 GHz
VSWR
≤1.15:1
≤1.15:1
Coupling Range
20–60 dB
20–60 dB
Directivity
12–15 dB
12–15 dB
Performance and Construction
Key Features
The couplers achieve full waveguide frequency coverage while maintaining exceptional power-handling capabilities, making them suitable for radar, satellite communications, and industrial heating systems. Their single-arm or multi-arm configurations offer flexibility for diverse signal routing needs. Constructed from corrosion-resistant aluminum or copper with Surtec-treated surfaces and chromate or painted finishes, they ensure durability in harsh operational environments.
Defined Coupling Levels
Published coupling options span 20 dB to 60 dB, allowing the sampled output level to be selected for monitoring, measurement, protection, or feedback functions.
Broadband Matching
A published VSWR of 1.15:1 supports low-reflection integration across the specified waveguide range. Model-specific insertion loss should be confirmed separately where it is a controlled requirement.
Connector Selection
N-Type, SMA and 2.92 mm female coupling ports are used across the product range to match frequency, power, cable and test-interface requirements.
Single or Dual Directional Formats
Single directional loop couplers and dual directional configurations can support forward-power sampling, reflected-power sampling, or two-direction monitoring.
Durable Metal Construction
Aluminum or copper construction, Surtec corrosion protection, polished flange faces, chromate treatment and painted finishes support demanding industrial and field environments.
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
These couplers are critical for high-frequency systems, including 5G networks, millimeter-wave radar, and microwave chemistry setups. Their pressure-sealed variants are tailored for aerospace and sealed industrial systems requiring reliable performance under extreme conditions.
- Radar and Electronic SystemsSample forward or reflected RF power in wideband radar transmitters, test systems and subsystem assemblies.
- Satellite CommunicationsProvide monitoring points within broadband uplink, downlink, ground-station or antenna-feed networks.
- 5G and Millimeter-Wave TestSupport broadband characterization and signal monitoring across high-frequency research, validation and network equipment.
- Industrial Microwave HeatingMonitor delivered and reflected power in heating, drying, plasma, materials-processing and process-control systems.
- Microwave Chemistry and Scientific ResearchProvide controlled signal access for experimental systems where wide bandwidth and repeatable power sampling are required.
Engineering Options
Customization & Support
Dolph Microwave offers tailored solutions for unique requirements, including custom coupling values, flange designs, and finishes. All models include Surtec corrosion protection and meet industrial reliability requirements. For technical specifications or design consultation, contact Dolph’s engineering team to optimize performance for your application.
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, mounting clearance and pressure-sealing requirement.
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 and interface information. Scroll horizontally on smaller screens to view all columns.
| 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 listed coupling range and directivity are product-family values. Confirm coupling tolerance, directivity across the full specified band, insertion loss, power handling, pressure rating and test conditions in the model-specific quotation or approved datasheet.
Ordering Logic
Part Number Guide
The original example part number is retained below. Use it as a configuration guide rather than as a substitute for a final approved model code.
DH-840DRWHC30NKPMA
The final part number should be confirmed against frequency range, directionality, coupling value, connector, flange arrangement and material.
- 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.
- 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.
- EnvironmentPressure sealing, temperature, corrosion exposure, vibration, finish and documentation.
Technical Documents
Downloads
The original download links are retained exactly as supplied.
Link check required: The first retained PDF is titled “High Power Termination,” not “Double-Ridge Waveguide Loop Coupler.” Keep it only if it is intentionally provided as related documentation; otherwise replace its URL with the correct coupler datasheet when available.
