915 & 2450 MHz Microwave Isolator
Help manage power reflected back toward your microwave source. Choose the isolator by frequency, power, cooling and waveguide connection, with a sampling coupler option where needed.
What needs to match your system?
The forward power rating is only part of the choice. Reflected power, cooling services and the connection to the source also matter.
Start with the operating limits
| Specification | Detail |
|---|---|
| Frequency Range | 915 MHz and 2450 MHz |
| Waveguide Size | WR340, WR430, WR975 |
| Handling Power | 6 KW, 10 KW, up to 20 kW cw |
| Cooling | Water or Air-Cooled |
| Flange Type | Cover and Grooved |
These are the published feature specifications. Check the detailed model data below for the configuration you need.
Need a measurement port as well?
The catalogue includes isolator-plus-coupler versions. If you prefer separate components, a stand-alone coupler can be reviewed alongside the isolator. Agree on the measurement arrangement and the mechanical connections together.
See the microwave coupler specifications.
For a system with a separate output path and absorbing load, also review the microwave circulator and microwave water load. These are different component choices, not automatic substitutes for the same assembly.
Check the fit before placing the order
Electrical ratings are not enough if the flanges, connectors or mounting points do not fit. A marked-up drawing is the clearest way to show the space you have.
Keeping an existing installation
Provide the old model, waveguide size, flange faces and mounting dimensions. Include cooling connections and any access limits around the equipment.
Changing the operating conditions
If the frequency, power or cooling has changed, send the new conditions with the old part details. Select against the new requirement before reusing the old specification.
Use the flange designation guide when naming the mating connection. Include a photo if the flange code is not known.
Agree on the build and the checks
Dolph’s manufacturing work includes CNC machining, turning, waveguide forming, brazing, plating and assembly. For a custom part, send the drawing requirements and the checks your team needs before ordering.
If you need dimensional results, RF measurements or specific inspection records, list them with your enquiry. Confirm the scope with the selected configuration. See Dolph’s manufacturing capabilities.
Full model and construction details
Compare the frequency, waveguide, connection and material before choosing a model. Send the catalogue reference if an entry matches your requirement.
The electrical, cooling and finish tables have different row counts. Their model correspondence needs confirmation. Three original cooling headers read “Water Pressure”; those headers are retained below, so do not infer a field name or dimension unit from them.
Electrical model catalogue
| Model | Config. | WR Type | Frequency (MHZ) | VSWR | IL (dB) | Isolation (dB) |
|---|---|---|---|---|---|---|
| DH-9WISO915PMA… | Isolator | WR975 | 915±25 | 1.2 | 0.25 | 20 |
| DH-9WISO+WHC915PMA… | Isolator+Coupler | WR975 | 915±25 | 1.2 | 0.25 | 20 |
| DH-14WISO1300PMA… | Isolator | WR650 | 1300±25 | 1.2 | 0.25 | 20 |
| DH-14WISO+WHC1300PMA… | Isolator+Coupler | WR650 | 1300±25 | 1.2 | 0.25 | 20 |
| DH-22WISO2450PMA… | Isolator | WR430 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-22WISO2450PMA… | Isolator | WR430 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-22WISO+WHC2450PMA… | Isolator+Coupler | WR430 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-26WISO2450PMA… | Isolator | WR340 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-26WISO2450PMA… | Isolator | WR340 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-26WISO+WHC2450PMA… | Isolator+Coupler | WR340 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-32WISO2450PMA… | Isolator | WR284 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-32WISO2450PMA… | Isolator | WR284 | 2450±25 | 1.2 | 0.25 | 20 |
| DH-32WISO+WHC2450PMA… | Isolator+Coupler | WR284 | 2450±25 | 1.2 | 0.25 | 20 |
Power and cooling catalogue
| Coupling (dB) | Handling Power (KW) | Cooling | Water Flow | Water Pressure | Water Pressure | Water Pressure |
|---|---|---|---|---|---|---|
| 20-75-100 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 511*852*213 | |
| 30-60 | 20-75-100 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 511*852*213 |
| 10 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 350*580*170 | |
| 30-60 | 10 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 350*580*170 |
| 3-5-6-15 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 183*335*112 | |
| 3 | Air | 183*335*95 | ||||
| 6 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 183*335*112 | |
| 30-60 | 3-5-6-15 | Water-Direct | 3-5L/min | 0.14MPa | Quick Connector | 183*335*112 |
Finish and material
| Flange Type | Inside Finish | Body Finish | Material |
|---|---|---|---|
| Cover/Grooved | Iridite per MIL-C-5541 | Anticorrosion Black Painted | Al |
| Cover/Grooved | Iridite per MIL-C-5541 | Anticorrosion Black Painted | Al |
| Cover/Grooved | Iridite per MIL-C-5541 | Anticorrosion Black Painted | Al |
| Cover/Grooved | Iridite per MIL-C-5541 | Anticorrosion Black Painted | Al |
Ordering information: DH – 26 WISO 2450 P M A 6KW
| Code | Description |
|---|---|
| DH | Dolph Microwave |
| 26 | Waveguide Type WR340 |
| WISO | Waveguide Isolator |
| 2450 | Freq. 2450 MHz |
| P | Flange Cover |
| M | Flange Grooved |
| A | Material Al |
| 6KW | Handling Power 6KW CW |
Questions before you order
Are the forward and reflected power limits the same?
Do not assume they are. Send both requirements and the expected operating duration. The selected isolator and cooling arrangement need to be checked together.
Can I replace a water-cooled unit with an air-cooled one?
The catalogue lists both cooling methods, but that does not make them interchangeable. Confirm the frequency, power, airflow and mechanical space for the proposed replacement.
The catalogue lists more frequencies and powers. Which values apply?
Use the exact configuration agreed for your order. The feature summary and the detailed tables cover different entries. Some table groups have different row counts, so their correspondence needs confirmation.
Do I need an isolator or a circulator with a load?
That depends on the required port arrangement and how reflected power is handled in your system. Send a simple connection sketch with the operating conditions so those choices can be compared.
Other parts worth checking
These components serve different jobs in a microwave system. Compare their own specifications and interfaces before combining them.
Microwave Water Load
For an absorbing termination with water cooling.
View product
Microwave Circulator
For routing microwave power between waveguide ports.
View product
Microwave Tuners
For adjusting the impedance match to the load.
View productHave a drawing or an existing part?
Send it with the details below. If some details are missing, tell us what you know and which points still need checking.
- Frequency; forward and reflected power
- Operating duration and cooling conditions
- Isolator only or a coupler-equipped assembly
- Waveguide, flange, mounting and coolant connections
Add the quantity, delivery destination and target date. Ask for the proposed configuration, drawing, price and lead time to be included in the quotation.
Email your requirements
