Microwave Ferrite Circulator

This microwave circulator is a microstrip design with a 12 mm radius. The magnetized ferrite material has a biasing field of 300 Oe in the -z direction perpendicular to the circulator plane and a saturation magnetization of 300 Gauss. The three microstrip lines forming the ports are terminated with 120 ohm resistors which approximately match the characteristic impedance of the mcrostrip. Figure 1 shows the circulator mounted on a metal ground plane.

Ferrite circulator structure.

Ferrite circulator structure.

The circulator is excited at Port 1 with a broadband input. S-Parameters were collected from a simulation and can be observed in Figure 2. The plots of S11, S21, and S31 show the first resonance near 6.6 GHz. At this frequency, Port 2 is 10 dB smaller than Port 3 while Port 1 is matched.

Broadband S-Parameters showing the isolation at the receive ports.

Broadband S-Parameters showing the isolation at the receive ports.

Steady state electric fields were also collected at 6.6 GHz, as shown in Figure 3. The null at Port 2 can be seen and is due to the interfering waves traveling around the ferrite at different velocities.

Steady state electric field strength at 6.6 GHz.

Steady state electric field strength at 6.6 GHz.

 

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