Circuit isolation using a signal splitter/combiner

A system of directing signals, the system comprising:

• a first-direction path configured for a first-direction signal that propagates in a first direction, the first-direction path including a first frequency band path and a second frequency band path, the first frequency band path configured to receive and amplify a first-direction first frequency band signal;
• the second frequency band path configured to receive and amplify a first-direction second frequency band signal;
• a second-direction path configured for a second-direction signal that propagates in a second direction that is opposite the first direction of the first-direction signal, the second-direction path configured to receive and amplify both a second-direction first frequency band signal and a second-direction second frequency band signal;
• a common port;
• a power splitter/combiner including a first port communicatively coupled to the first-direction path, a second port communicatively coupled to the second-direction path and a third port communicatively coupled to the common port, the power/splitter combiner configured to receive the first-direction signal from the first-direction path at the first port and direct the first-direction signal to the third port such that the first-direction signal is directed toward the common port and away from the second-direction path.