Aspects describe a wideband active quasi-circulator that has the advantages of small size, lightweight, and compatibility with monolithic microwave integrated circuit (MMIC) technology. An active quasi-circulator is provided that comprises both a power amplifier and a low noise amplifier. The active quasi-circulator can operate over a wide frequency range with isolation or substantial isolation between a power amplifier and a low noise amplifier that is tunable with isolation or substantial isolation at any frequency within the wide frequency range. The provided quasi-circulator is suitable for use in mobile units in multi-band radio frequency communication systems, as well as in other configurations.