High Power Termination
The WHPL series terminates a rectangular waveguide path by absorbing incident RF power. The published air-cooled models span WR650 to WR10, with individual bands within 1.13–112 GHz and model-dependent CW ratings of 10–4000 W. Select the load by its complete model row, flange and cooling conditions; a low VSWR does not establish a peak-power rating or guarantee protection under every fault.
Dolph Microwave high-power waveguide terminations provide a dissipative load at the end of a transmission line or an unused RF port. The published air-cooled WHPL models list VSWR values from 1.03:1 to 1.15:1 and CW ratings from 10 W to 4000 W, depending on the selected band and model. Confirm airflow, ambient temperature, installation orientation and incident power before applying a rating. Material, flange, finish and ingress-protection entries remain tied to the model table.
Product range at a glance
Frequency & WR Size
Match the complete operating band to the corresponding standard rectangular waveguide size.
Continuous Power
Provide continuous power, anticipated peak power and duty profile.
Cooling Conditions
Air-cooled models require sufficient ventilation and heat-release clearance.
Flange Interface
Confirm cover or grooved construction and the exact EIA/IEC designation.
Air-cooled model matrix
| Model | Freq. Range (GHz) | WG Size | VSWR | Avg. Power CW (W) | Cooling Method | Cover Flange | Grooved Flange | Ingress Protection | Material | Finish |
|---|---|---|---|---|---|---|---|---|---|---|
| DH-14WHPL… | 1.13–1.73 | WR650 | 1.03:1 | 1000–4000 | Air Cooled | UDR14 | PDR14 | IP65 | Al/Cu | Chromate/Painted |
| DH-18WHPL… | 1.45–2.2 | WR510 | 1.03:1 | 1000–3000 | Air Cooled | UDR18 | PDR18 | IP65 | Al/Cu | Chromate/Painted |
| DH-22WHPL… | 1.72–2.61 | WR430 | 1.03:1 | 100–3000 | Air Cooled | UDR22 | PDR22 | IP65 | Al/Cu | Chromate/Painted |
| DH-26WHPL… | 2.17–3.3 | WR340 | 1.03:1 | 100–3000 | Air Cooled | UDR26 | PDR26 | IP65 | Al/Cu | Chromate/Painted |
| DH-32WHPL… | 2.6–3.95 | WR284 | 1.03:1 | 100–3000 | Air Cooled | UDR32 | PDR32 | IP65 | Al/Cu | Chromate/Painted |
| DH-40WHPL… | 3.22–4.9 | WR229 | 1.03:1 | 100–3000 | Air Cooled | UDR40 | PDR40 | IP65 | Al/Cu | Chromate/Painted |
| DH-48WHPL… | 3.94–5.99 | WR187 | 1.03:1 | 100–3000 | Air Cooled | UDR48 | PDR348 | IP65 | Al/Cu | Chromate/Painted |
| DH-58WHPL… | 4.64–7.05 | WR159 | 1.03:1 | 100–3000 | Air Cooled | UDR58 | PDR58 | IP65 | Al/Cu | Chromate/Painted |
| DH-70WHPL… | 5.38–8.17 | WR137 | 1.03:1 | 100–3000 | Air Cooled | UDR70 | PDR70 | IP65 | Al/Cu | Chromate/Painted |
| DH-84WHPL… | 6.57–9.99 | WR112 | 1.03:1 | 100–3000 | Air Cooled | UDR84/UBR84 | PDR84/PBR84 | IP65 | Al/Cu | Chromate/Painted |
| DH-100WHPL… | 8.2–12.5 | WR90 | 1.03:1 | 100–3000 | Air Cooled | UDR100/UBR100 | PDR100/PBR100 | IP65 | Al/Cu | Chromate/Painted |
| DH-120WHPL… | 9.84–15 | WR75 | 1.03:1 | 100–3000 | Air Cooled | UBR120 | PBR120 | IP65 | Al/Cu | Chromate/Painted |
| DH-140WHPL… | 11.9–18 | WR62 | 1.03:1 | 100–3000 | Air Cooled | UBR140 | PBR140 | IP65 | Al/Cu | Chromate/Painted |
| DH-180WHPL… | 14.5–22 | WR51 | 1.03:1 | 100–2500 | Air Cooled | UBR180 | PBR180 | IP65 | Al/Cu | Chromate/Painted |
| DH-220WHPL… | 17.6–26.7 | WR42 | 1.03:1 | 100–2500 | Air Cooled | UBR220 | PBR220 | IP65 | Al/Cu | Chromate/Painted |
| DH-260WHPL… | 21.7–33 | WR34 | 1.03:1 | 100–2500 | Air Cooled | UBR260 | PBR260 | IP65 | Al/Cu | Chromate/Painted |
| DH-320WHPL… | 26.3–40 | WR28 | 1.03:1 | 100–2500 | Air Cooled | UBR320 | PBR320 | IP65 | Al/Cu | Chromate/Painted |
| DH-400WHPL… | 32.9–50.1 | WR22 | 1.15:1 | 100–1500 | Air Cooled | FUGP400 | UG-383U/M | IP65 | Al/Cu | Chromate/Painted |
| DH-500WHPL… | 39.2–59.6 | WR19 | 1.15:1 | 100–1500 | Air Cooled | FUGP500 | UG-383U/M | IP65 | Al/Cu | Chromate/Painted |
| DH-620WHPL… | 49.8–75.8 | WR15 | 1.15:1 | 100–1500 | Air Cooled | FUGP620 | UG-385U/M | IP65 | Al/Cu | Chromate/Painted |
| DH-740WHPL… | 60.5–91.9 | WR12 | 1.15:1 | 10–100 | Air Cooled | FUGP740 | UG-387U/M | IP65 | Al/Cu | Chromate/Painted |
| DH-900WHPL… | 73.8–112 | WR10 | 1.15:1 | 10–100 | Air Cooled | FUGP900 | UG-387U/M | IP65 | Al/Cu | Chromate/Painted |
Materials
Published material options are aluminum or copper, selected according to thermal, mass, conductivity and mechanical requirements.
Surface Protection
Published models include Surtec/corrosion protection treatment and flat-black paint. Flanges are unplated, polished and Surtec treated.
Flange Options
Cover and grooved flange designations are listed by model. Verify mating compatibility before ordering.
Capabilities available for component support
RF Measurement
The company support page lists vector and scalar RF measurement resources up to 100 GHz. This does not establish measured full-band acceptance for every model listed up to 112 GHz; request the test coverage and report for the selected load.
Environmental Testing
Temperature, humidity, salt-fog and other environmental testing must be specified for the delivered assembly. General facility capability is not evidence that every load has passed each test.
Precision Manufacturing
Capabilities include CNC milling and turning, waveguide forming and bending, brazing, soldering, plating, passivation and assembly.
Technical reading for specification work
Waveguide Power Handling: CW, Peak Power, Breakdown and Cooling
Review practical power limits and thermal considerations.Waveguide Frequency Bands Chart: WR Sizes and Cutoff Frequency
Compare operating ranges before selecting the load size.Waveguide Flange Size Guide: EIA, IEC and Gasket Fit
Verify mating flange and gasket compatibility.Compatible products for the waveguide path
High Power Water-Cooled Loads
For substantially higher average-power dissipation.
Waveguide Termination
Review the broader termination product family.
High-Power Waveguide Coaxial Adapter
Transition between waveguide and coaxial interfaces.
Straight Waveguide Sections
Connect the load into a rigid transmission path.
Waveguide Flange Standard EIA & IEC
Check flange families and designation conventions.
Low Power Min (Short) Termination
A compact alternative for lower-power applications.
