How to select RF Dual Directional Couplers
RF dual directional couplers are four port devices in which two directional couplers are connected in series, in opposing directions or a directional coupler with a single main line and two secondary lines for coupling.
Frequency (MHz): This is the frequency range over which the coupler can operate while providing a constant level of coupling with minimal loss and reflection.
Coupling (dB): This is the ratio of incident power fed to the main port to the power at the output of the coupled port.
Coupling Variation (dB): The maximum peak-to-peak variation in coupling expected over the specified frequency range for dual directional couplers.
Insertion Loss (dB): The reduction in output power due to the power transferred to the coupled line.
Directivity (dB): The difference between the power level of the coupled and isolated ports. The directivity is a measure of independence of the coupled and isolated ports.
Average Power (W): The level of power that a coupler can handle while maintaining minimal reflections i.e with a matched load.
Impedance (Ohms): The impedance of a coupler must match the circuit/system it is connected to; this will minimize any reflection within the circuit/system. Usually the impedance is 50 Ohms or 75 Ohms.
Package Type: RF Couplers are 4 port devices available with various connector options – SMA, N Type, BNC etc.