How do ferrite circulators direct microwave energy?

Ferrite circulators direct microwave energy by utilizing the gyromagnetic properties of magnetic ceramics.1

At microwave frequencies (ranging from 1 to 300 gigahertz), these materials exhibit a unique interaction with electromagnetic waves. Because ferrites possess ferrimagnetic characteristics, they can rotate the polarization of microwave energy as it passes through them. In devices known as circulators, this rotation allows the ferrite to effectively steer or direct the microwave signal in a specific direction or orientation within a waveguide. This capability is essential for controlling the flow of energy in various microwave and radar applications.12