Multiphysics Analysis of a 2.45 GHz Magnetron in Free Running and Injection Locked Modes

Magnetrons being compact high power oscillators, find wide applications in industrial heating systems, long range mm-wave RADARs and Wireless Power Transfer circuits. Magnetrons exhibit high phase noise in free running mode, and are stabilized using the well-known injection locking technique. In this paper, a numerical multiphysics analysis scheme is proposed to study operating principles of a 2.45 GHz commercial Continuous Wave magnetron in free running as well as injection locked mode. The CAD model of the magnetron is developed in CST. The free running frequency of the CAD model is calculated to be 2.4594 GHz, which is stabilized and pulled to 2.4501 GHz through injection locking. Thermal multiphysics analysis is also performed to compute mechanical stresses on the anode during high power operation. The proposed numerical scheme can be implemented to furnish injection locking requirements for high power magnetrons at other frequencies.