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Blocking Matrix Switches

A blocking matrix switch is constructed with switches on both the input ports and the output ports. Each input signal can be switched to only one output port at a time. If your application requires an input to be available to more than one output simultaneously, then a non-blocking matrix becomes necessary. Example block diagrams for blocking matrix switches are shown below the model selection table.

The two most notable advantages of a blocking matrix switch are insertion loss and isolation. Because the matrix construction uses only switches, the insertion loss will be lower than any other matrix configuration. Using only switches also makes it possible to maintain very high isolation from input to output because switches have better isolation characteristics than power divider/combiners. The one disadvantage is that each input is only available to a single output.

Below is a sortable table containing our online blocking matrix switch models. If you can’t find a model that meets your requirements, please contact us. One of our engineers will work with you to pick out an existing model or design a custom model for your application. JFW does not charge NRE’s and our pricing for custom models is in-line with our catalog models.

Sample Test Programs
Ethernet & RS-232 Commands
GPIB Commands

Click the column headers to sort our online models. For your specific application, please contact JFW for assistance or use our Inquiry Form.

JFW Model #ImpedanceConfigurationUnused PortsFrequency StartFrequency StopRF Input PowerRF Connectors
50MS-21150 Ohms4 x 8 Blocking RF Matrix SwitchReflective0 MHz (DC)6000 MHz1 WattSMA
50MS-28650 Ohms12 x 4 Blocking RF Matrix SwitchAbsorptive0 MHz (DC)6000 MHz1 WattSMA
50MS-29150 Ohms12 x 8 Blocking RF Matrix SwitchAbsorptive700 MHz3000 MHz0.1 WattN
50MS-30350 Ohms3 x 3 Blocking RF Matrix SwitchReflective0 MHz (DC)6000 MHz1 WattN
50MS-30550 Ohms18 x 4 Blocking RF Matrix SwitchAbsorptive0 MHz (DC)6000 MHz1 WattSMA
50MS-32350 Ohms12 x 12 Blocking RF Matrix SwitchAbsorptive700 MHz3000 MHz1 WattN
50MS-33450 Ohms2 x 12 Blocking RF Matrix SwitchAbsorptive700 MHz3000 MHz1 WattN
50MS-33750 Ohms24 x 4 Blocking RF Matrix SwitchAbsorptive700 MHz3000 MHz0.1 WattsN, SMA, TNC
50MS-34050 Ohms40 x 8 Blocking RF Matrix SwitchReflective500 MHz6000 MHz0.2 WattN, SMA
50MS-34250 Ohms2 x 18 Blocking RF Matrix SwitchAbsorptive700 MHz3000 MHz1 WattN
50MS-35650 Ohms2 x 12 Blocking RF Matrix SwitchAbsorptive0 MHz (DC)26500 MHz0.25 WattsSMA
50MS-36750 Ohms4 x 4 Blocking RF Matrix SwitchAbsorptive0 MHz (DC)40000 MHz8 Watts2.92 mm

Blocking Matrix Switch Examples

A blocking matrix switch is built with switches on both the inputs and the outputs. A 3×3 blocking matrix switch uses 1P3T switches on both halves of the matrix. The switches limit the matrix functionality so that each input signal can be connected to only one output port at a time.

3 x 3 Blocking Matrix > maximum of 3 active paths through the matrix
8 x 4 Blocking Matrix > maximum of 4 active paths through the matrix
4 x 8 Blocking Matrix > maximum of 4 active paths through the matrix
8 x 2 Blocking Matrix > maximum of 2 active paths through the matrix

Block Diagram #1
This block diagram illustrates the construction of a 3 X 3 blocking matrix switch. It shows all of the connectivity between the input ports and the output ports. A 1P3T switch can have only one active path.

Block Diagram #2
This block diagram shows one possible setting of a 3 X 3 blocking matrix switch. There are three input signals (blue, red, green). Each input signal is connected to one output port. The three colored paths are the three active paths through the matrix. A 3 x 3 blocking matrix has a maximum of 3 active paths.

Block Diagram #3
This block diagram shows another possible setting of the 3 X 3 blocking matrix switch. There are three input signals (blue, red, green). Each input signal is connected to one output port. The three colored paths are the three active paths through the matrix. A 3 x 3 blocking matrix has a maximum of 3 active paths.

Capabilities & Options

Custom Models
The models listed in the above table showcase some of our standard RF matrix switches. However, most of JFW’s test system business involves custom designed models. JFW does not charge NRE’s for custom models. We encourage you to email us your specific requirement (sales@jfwindustries.com). We will respond with a ROM (rough order of magnitude) quote in 1-2 days.

Remote Commands
JFW has standard remote commands for GPIB, Ethernet, and RS-232 controlled models. The command syntax is simple and allows easy control of the RF path settings. In addition to our standard commands, JFW can also provide customer specific commands upon request.

Test Software
JFW provides a GUI test program with all Ethernet and RS-232 controlled test systems. The test software for RF matrix switches has all of the remote commands built in for easy testing. Check out our sample test programs to see for yourself.

Options
Impedance:
50 Ohm or 75 Ohm models available
Remote Control: Ethernet, RS-232, GPIB, or TTL
Manual Control: Keypad and display
Enclosures: Benchtop or 19″, 23″, 24″ rack enclosures
Supplied Power: AC, Dual redundant AC, or DC powered
RF Connectors: BNC, TNC, SMA, N, etc.
Attenuators: Electro-mechanical (up to 18GHz) or Solid-State (up to 6GHz)

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