System and Method for a Directional Coupler

A method of operating a circuit comprising a directional coupler having a plurality of ports comprising an input port, a transmitted port, an isolated port and a coupled port, and an adjustable termination coupled to at least one of the plurality of ports, the method comprising:

• receiving a first signal from at least one of the input port and the transmitted port;
• monitoring a second signal from at least one of the isolated port and the coupled port;
• and
• adjusting the adjustable termination to increase a directivity of the directional coupler based on the monitoring.

A radio frequency (RF) system comprising:

• a directional coupler having a plurality of ports comprising an input port, a transmitted port, an isolated port and a coupled port;
• a direction select switch having a first input coupled to the isolated port, a second input coupled to the coupled port, a switch signal output port, a first termination output port, and a second termination output port, wherein, in a first state, the direction select switch is configured to couple the isolated port to the switch signal output port and the coupled port to the first termination output port, and in a second state the direction select switch is configured to couple the coupled port to the switch signal output port and the isolated port to the second termination output port;
• a first adjustable impedance element coupled to the first termination output port;
• and
• a second adjustable impedance element coupled to the second termination output port.