Dolph Microwave
Low-Power Short Waveguide Terminations
Dolph Microwave low-power short waveguide terminations absorb RF energy at the end of a waveguide path. The compact matched-load format is intended for test fixtures and terminated ports where installation length is limited. “Short” describes the body length; it does not mean a reflective shorting plate.
The DH-WMPL model table spans WR650–WR28, with individual bands within 1.13–40 GHz, listed VSWR of 1.2:1 and lengths of 20–160 mm. CW power options vary by model: the WR650 row lists 2–50 W, while WR28 lists 2–15 W. Select the rated configuration before connecting the load to an RF source.
Combined model coverage1.13–40 GHz
Listed VSWR1.2:1
Model lengths20–160 mm
This load belongs to the standard waveguide range. Use the flange fit guide to check the mating interface.
Before you order
Start with power, then check the space
CW power comes first
The WR650 row lists 2–50 W, while the WR28 row lists 2–15 W. A power range denotes available ratings, not a variable operating limit for every unit. Specify the required CW rating and confirm the selected part number. For pulses, provide peak power, pulse width and duty cycle; the CW value alone does not establish a pulse rating.Overall length changes by band
The listed WR650 load is 160 mm long. The WR28 version is 20 mm long. The table retains the dimensions for every model between them.Flange and finish
The table lists Al/Cu bodies, Chromate/Painted finish and IP65. Match the cover or grooved flange to the mating component. For an exposed installation, request the ingress-protection evidence and mounting conditions for the quoted configuration.For a measurement setup, you may also need a waveguide fixed attenuator or a waveguide calibration kit.
For the rest of your setup
Testing at more power?
A small termination is not a substitute for a higher-power load. If your test level exceeds the selected CW rating, compare the high-power termination range before placing the order. View high-power waveguide terminationsTechnical data
Specifications & dimensions
Select by the complete model row. Swipe or scroll across the table to see all columns. PDF and STEP labels identify document types; request the current files for the selected model.
| MODEL | FREQUENCY RANGE(GHz) | WG SIZE | VSWR | POWER RATING CW (W) | FLANGES TYPE | LENGTH (mm) | INGRESS PROTECTION | MATERIAL | FINISH | DATASHEET | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| COVER | GROOVED | |||||||||||
| DH-14WMPL… | 1.13-1.73 | WR650 | 1.2:1 | 2~50 | UDR14 | PDR14 | 160 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-18WMPL… | 1.45-2.2 | WR510 | 1.2:1 | 2~50 | UDR18 | PDR18 | 160 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-22WMPL… | 1.72-2.61 | WR430 | 1.2:1 | 2~50 | UDR22 | PDR22 | 145 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-26WMPL… | 2.17-3.3 | WR340 | 1.2:1 | 2~50 | UDR26 | PDR26 | 120 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-32WMPL… | 2.6-3.95 | WR284 | 1.2:1 | 2~50 | UDR32 | PDR32 | 100 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-40WMPL… | 3.22-4.9 | WR229 | 1.2:1 | 2~50 | UDR40 | PDR40 | 80 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-48WMPL… | 3.94-5.99 | WR187 | 1.2:1 | 2~50 | UDR48 | PDR48 | 55 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-58WMPL… | 4.64-7.05 | WR159 | 1.2:1 | 2~50 | UDR58 | PDR58 | 50 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-70WMPL… | 5.38-8.17 | WR137 | 1.2:1 | 2~30 | UDR70 | PDR70 | 45 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-84WMPL… | 6.57-9.99 | WR112 | 1.2:1 | 2~30 | UDR84/UBR84 | PDR84/PBR84 | 40 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-100WMPL… | 8.2-12.5 | WR90 | 1.2:1 | 2~20 | UDR100/UBR100 | PDR100/PBR100 | 40 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-120WMPL… | 9.84-15 | WR75 | 1.2:1 | 2~20 | UBR120 | PBR120 | 35 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-140WMPL… | 11.9-18 | WR62 | 1.2:1 | 2~20 | UBR140 | PBR140 | 30 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-180WMPL… | 14.5-22 | WR51 | 1.2:1 | 2~20 | UBR180 | PBR180 | 30 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-220WMPL… | 17.6-26.7 | WR42 | 1.2:1 | 2~15 | UBR220 | PBR220 | 30 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-260WMPL… | 21.7-33 | WR34 | 1.2:1 | 2~15 | UBR260 | PBR260 | 20 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| DH-320WMPL… | 26.3-40 | WR28 | 1.2:1 | 2~15 | UBR320 | PBR320 | 20 | IP65 | Al/Cu | Chromate/Painted | STEP | |
| Part Number Guide: DH-100WMPL20PA “100”—Waveguide Size | WR90 “WMPL”—Waveguide Type | Precision Low Power Min. (Short) Loads “20”— Power Rating | 20 W “P”— Flange Type | Rectangular Flat “M”— Flange Type | Rectangular Grooved “A/C”— Material | Aluminium, Cu | ||||||||||||
| Note: All Dolph-MW models include an surtec/corrosion protection treatment and are painted flat black. Flanges are unplated, polished and surtec. Other finishes and paint colors are available upon request. | ||||||||||||
Materials & ordering options
Load constructionShort waveguide section with a tapered dielectric load
Listed materialsAl/Cu
Listed finishChromate/Painted
Standard surface notesSurtec treatment; flat black paint; unplated, polished flanges
Other finishesAvailable upon request
Technical documents
Questions before ordering
Can this load be connected directly to a high-power amplifier?
Only if the power reaching the load is within its selected rating. The product table specifies low-power CW ranges, not unrestricted amplifier output.What does “short” refer to?
It refers to the compact physical format of this matched load. It is not a waveguide shorting plate.Related products
Precision Waveguide Calibration Kits
View product For calibrating the measurement setup; a compact load is not automatically a calibration standard.
Waveguide Fixed Attenuator
View product For a specified attenuation step in the test path.
High-Power Waveguide to Coaxial Adapter
View product For connecting the waveguide path to a coaxial interface.Tell us what you need
