A coaxial switch is a passive electromechanical relay used to switch RF signals from one channel to another. This type of switch is widely used in signal routing situations that require high frequency, high power, and high RF performance. It is also frequently used in RF testing systems, such as antennas, satellite communications, telecommunications, base stations, avionics, or other applications that require switching RF signals from one end to another.
Switch port
NPMT: which means n-pole m-throw, where n is the number of input ports and m is the number of output ports. For example, an RF switch with one input port and two output ports is called a single pole double throw, or SPDT/1P2T. If the RF switch has one input and 6 outputs, then we need to choose the SP6T RF switch.
RF characteristics
We usually take four items into consideration: Insert loss, VSWR, Isolation and Power.
Frequency type:
We can choose the coaxial switch according to the frequency range of our system. The max frequency we can offer is 67GHz. Usually, we can determine the frequency of coaxial switch based on its connector type.
SMA Connector: DC-18GHz/DC-26.5GHz
N Connector: DC-12GHz
2.92mm Connector: DC-40GHz/DC-43.5GHz
1.85mm Connector: DC-50GHz/DC-53GHz/DC-67GHz
SC Connector: DC-6GHz
Average power: Below picture shows the average power db design’s switches.
Voltage:
The coaxial switch includes an electromagnetic coil and magnet, which require DC voltage to drive the switch to the corresponding RF path. The voltage types commonly used in coaxial switches are as follows: 5V.12V.24V.28V. Usually customers will not use 5V voltage directly. We support an option TTL to let a low voltage like 5v to control RF switch.
Drive type：
Failsafe：When no external control voltage is applied, one channel is always conducting. Add an external power supply, the RF channel is conducted to another. When the voltage cut off, the former RF channel is conducting.
Latching: Latching type switch need continuously power supply to keep the revelant RF channel conducting. After the power supply disappears, the latching drive can remain in its final state.
Normally Open: This working mode is only valid for SPNT. Without the controlling voltage, all switch channels are not conducting; Add an external power supply and select the specified channel for the switch; When the external voltage is not applied, the switch returns to a state where all channels are not conducting.
Indicator: This function is helps to show the switch status.
Post time: Mar-06-2024