On the Frequency Scaling of High Power CW Magnetrons

After being used for conventional household and industrial applications for decades, magnetrons are recently being used for various niche applications. As magnetrons were used in typical applications near 915 MHz and 2.45 GHz for long, we can see more availability of designs at these frequencies. This paper shows that building a CW magnetron at higher unconventional frequencies is not a straightforward task. A magnetron for 3.7 GHz output frequency is presented from scaling an existing design of 2.45 GHz magnetron from the literature. Multiphysics analysis with heating, cooling and stress analysis was performed to show why a simple frequency scaling won't work for designing CW magnetrons at higher frequencies.