Abstract
The transmission characteristics of a low-height circulator that we designed were simulated, using highfrequency electromagnetic analysis based on the finite element method. To reduce the height of the circulator, we dramatically reduced the thickness of the iron yoke and the ferrite magnet while maintaining the required magnetic bias field strength. The circulator has a hexagonal platelet shape with a diagonal line length of 7.5 mm and a height of 0.85 mm. It is composed of a 0.2-mm-thick ferrite magnet, a 0.3-mm-thick YIG ferrite platelet, a 0.17-mm-thick iron yoke, and a microstrip Y-junction. The simulation results exhibited acceptable nonreciprocal transmission characteristics with an insertion loss of 0.67 dB, and a return loss and an isolation both greater than 20 dB.
