A circulator is a passive radio-frequency electronic device in which a signal entering any port is transmitted to the next port (only) in rotation.
Circulator may also refer to:
Passive radio frequency and microwave circulator, a device that utilizes magnetized ferrite to provide the circulator function Active radio frequency and microwave circulator, a circulator that includes semiconductors to provide the circulator function and requires a power source Optical circulator, the optical equivalent of a conventional circulator Acoustic circulator, a non-reciprocal audio device Circulator pump, a pump that is used to circulate gases, liquids, or slurries in a closed circuit Downtown circulator, a road or bus system that distributes traffic or people through a downtown area DC Circulator, a bus system in Washington, D.C.