Broadwall directional couplers use multiple coupling apertures to transfer a defined fraction of power from the main guide to a sampling path. Dolph lists WR650–WR28 configurations over 1.13–40 GHz, with 3–40 dB nominal coupling and single- or dual-direction outputs. Select the port style, coupling and directivity together, then check sample-port power and instrument compatibility.
Multi-hole broadwall couplers provide directional samples from a waveguide transmission path. Published configurations cover 1.13–40 GHz and WR650–WR28, with 3–40 dB nominal coupling and waveguide or coaxial sample ports. Single-direction and dual-direction arrangements serve different monitoring requirements; select the actual port diagram before assigning sensors or loads.
The coupler uses a precision-machined Tchebyscheff coupling-hole distribution between the main waveguide and secondary arm. A precision-ground tapered load element terminates the secondary arm. This construction is used to obtain high directivity and stable coupling across the specified band.
The selected coupling determines the split. In an ideal matched example, 3 dB coupling transfers about half the incident power to the coupled path, whereas 20 dB transfers 1%. Thus “a small sample” does not describe every listed coupling value; include the split when checking through-path power and sensor limits.
The aperture distribution and secondary-arm termination distinguish energy travelling in the intended direction from energy travelling in the opposite direction.
The sampled signal is delivered through a waveguide or coaxial port for power monitoring, frequency monitoring and reflected-power measurements.
Single-direction broadwall coupler with two main-line waveguide ports and one waveguide secondary port.
Four-waveguide-port arrangement with an unterminated secondary line for external connection or system integration.
Waveguide through line with one coaxial coupled output. N-Type is listed for lower bands, SMA for higher bands, and 2.92 mm K-type for applicable WR42–WR28 units.
Waveguide main line with two coaxial secondary ports for a four-port arrangement.
Dual-arm broadwall directional coupler for separate forward and reverse waveguide sampling outputs.
Dual-direction monitoring with two waveguide main-line ports and separate coaxial forward/reverse sample ports.
The table preserves the published standard model bands. VSWR columns shown here correspond to waveguide-secondary configurations (Styles 1, 2 and 5). Coaxial-secondary configurations use the style-specific values described above.
| Model Prefix | Frequency (GHz) | IEC | EIA | Main VSWR Max | WG Secondary VSWR Max | Published Flange Family | Material |
|---|---|---|---|---|---|---|---|
| DH-14 | 1.13–1.73 | R14 | WR650 | 1.10 | 1.15 | FDP / FDM | Al / Cu |
| DH-18 | 1.45–2.20 | R18 | WR510 | 1.10 | 1.15 | FDP / FDM | Al / Cu |
| DH-22 | 1.72–2.61 | R22 | WR430 | 1.10 | 1.15 | FDP / FDM | Al / Cu |
| DH-26 | 2.17–3.30 | R26 | WR340 | 1.10 | 1.15 | FDP / FDM | Al / Cu |
| DH-32 | 2.60–3.95 | R32 | WR284 | 1.10 | 1.15 | FDP / FDM | Al / Cu |
| DH-40 | 3.22–4.90 | R40 | WR229 | 1.08 | 1.12 | FDP / FDM | Al / Cu |
| DH-48 | 3.94–5.99 | R48 | WR187 | 1.08 | 1.12 | FDP / FDM | Al / Cu |
| DH-58 | 4.64–7.05 | R58 | WR159 | 1.08 | 1.12 | FDP / FDM | Al / Cu |
| DH-70 | 5.38–8.17 | R70 | WR137 | 1.08 | 1.12 | FDP / FDM | Al / Cu |
| DH-84 | 6.57–9.99 | R84 | WR112 | 1.08 | 1.12 | FBP / FBM / FBE | Al / Cu |
| DH-100 | 8.20–12.40 | R100 | WR90 | 1.08 | 1.12 | FBP / FBM / FBE | Al / Cu |
| DH-120 | 9.84–15.0 | R120 | WR75 | 1.08 | 1.12 | FBP / FBM / FBE | Al / Cu |
| DH-140 | 11.9–18.0 | R140 | WR62 | 1.10 | 1.15 | FBP / FBM / FBE | Al / Cu |
| DH-180 | 14.5–22.0 | R180 | WR51 | 1.10 | 1.15 | FBP / FBM / FBE | Al / Cu |
| DH-220 | 17.6–26.7 | R220 | WR42 | 1.10 | 1.15 | FBP / FBM / FBE | Al / Cu |
| DH-260 | 21.7–33.0 | R260 | WR34 | 1.10 | 1.15 | FBP / FBM / FBE | Al / Cu |
| DH-320 | 26.3–40.0 | R320 | WR28 | 1.10 | 1.15 | FBP / FBM / FBE | Al / Cu |
Datasheet notes: nominal coupling accuracy ±0.7 dB; frequency sensitivity ±1 dB; coupling range 3–40 dB; material Al/Cu; multiple flange types are available; standard finish is corrosion protection plus black top coat.
Provide the operating frequency range and the corresponding IEC or EIA waveguide size.
Choose one sampled direction or separate forward and reverse sampled outputs.
Confirm waveguide or coaxial coupled ports, connector type and main-line flange arrangement.
Provide the required CW and peak power, pulse conditions, maximum mismatch, sample-port termination and sensor input limit, together with material, finish, drawing envelope and quantity. Coupling and directivity specifications do not replace power ratings.
Tchebyscheff coupling-hole distribution is used to support directivity and coupling flatness.
A precision-ground tapered load element is used in the terminated secondary arm.
The specification tables list aluminum and copper. The product page also describes oxygen-free hard copper or copper-alloy construction.
Corrosion-protection treatment plus black top coat. Other finishes or mechanical arrangements can be reviewed on request.
Sampling incident or reflected energy in test setups, transmitter chains and waveguide assemblies.
Directional monitoring and diagnostic sampling within qualified radar and defence microwave subsystems.
Signal and power sampling in uplink, downlink, earth-station and antenna-feed waveguide networks.
The through path remains connected while power is sampled, but coupling diverts power and the device also has real dissipative loss. Include both effects in the link budget; continuous monitoring does not imply zero insertion loss.
Frequency monitoring, reflected-power evaluation and experimental microwave measurements.
Integration into larger waveguide runs where port orientation, flange type or mechanical envelope must match an existing system.
Eight-page specification covering six port arrangements, model tables, accuracy, sensitivity, connector notes and ordering information.
Technical ReferenceWaveguide Flange Standard EIA & IECReview the flange designation system used when selecting mating interfaces.
Product CategoryStandard Waveguide ComponentsBrowse related standard waveguide products for a complete RF transmission assembly.
Compact crossguide sampling arrangements with waveguide and coaxial port options.
Alternative CouplerWaveguide Loop CouplerLoop-coupled configurations for applications requiring a different coupling structure.
Alternative CouplerWaveguide Probe CouplerProbe-based sample-port configurations for selected waveguide systems.
System IntegrationWaveguide-to-Coaxial AdaptersConnect waveguide runs to coaxial instruments, cables and RF equipment.
System IntegrationWaveguide TerminationsMatched terminations for unused ports, measurement setups and waveguide assemblies.
System IntegrationFlexible WaveguideFlexible routing sections for alignment, installation and vibration accommodation.
Background on how conductor, substrate and mechanical material choices influence RF performance.
Coupling StructureHow Many Holes Can Be Used in a Directional Coupler?An introduction to coupling apertures and the difference between physical ports and coupling holes.
Component ComparisonDirectional Couplers vs. TapsCompare directional signal sampling with non-directional signal division.
The published standard product line covers 1.13–40 GHz, corresponding to WR650 through WR28. Additional sizes or special configurations are available for review on request.
The product datasheet lists a nominal coupling range of 3–40 dB. The website identifies common values including 3, 6, 10, 20, 30 and 40 dB. Confirm the required value and operating band when requesting a model.
WC identifies single-arm broadwall configurations in the datasheet. WUC is used for four-port secondary-line arrangements. WDXC identifies dual-arm configurations for separate forward and reverse sampling.
Yes. The six published styles include waveguide secondary ports and coaxial secondary ports. Listed coaxial interfaces include N-Type, SMA and 2.92 mm K-type according to waveguide band and configuration.
Use the value for the selected port style and model. Waveguide-secondary and single-coax configurations list up to 20–38 dB minimum, while the two-coax four-port Style 4 lists 20–25 dB minimum.
The datasheet separately states nominal coupling accuracy of ±0.7 dB and frequency sensitivity of ±1 dB. These are not a complete power-measurement uncertainty specification. Include sensor calibration, cable loss, mismatch and directivity when setting the measurement acceptance requirement.
The specification tables list aluminum and copper. The product page also references oxygen-free hard copper or copper alloy. The standard ordering note states corrosion protection plus a black top coat.
Provide frequency range, waveguide size, required coupling, single- or dual-direction monitoring, coupled-port interface, connector and flange types, material, mechanical drawing or envelope, quantity and any environmental or documentation requirements.
For technical review, include the frequency range, waveguide size, coupling value, port arrangement, connector, flange, material, mechanical constraints and quantity.
Contact Dolph Microwave sales@dolphmicrowave.com +86 29 8881 0979
