Circulator

A circulator is a specialized device used in microwave and radio frequency systems to direct signals in a specific sequence between multiple ports. It allows signals to flow in a one-way loop—sending signals from one port to the next in a consistent direction—without allowing reverse flow. This controlled directionality helps protect sensitive equipment, manage signal routing, and improve system efficiency. Commonly used in radar, satellite, and communication systems, circulators are essential for isolating transmit and receive paths, ensuring signals are properly directed, and preventing interference or damage.