Origin of Sideband and Spurious Noises in Microwave Oven Magnetron

Baek I.-K., Sattorov M., Bhattacharya R., Kim S., Hong D., Min S.-H., Park G.-S.
IEEE Transactions on Electron Devices, 64(8), 3413(2017)
DOI:10.1109/TED.2017.2714339

Abstract

The 3-D particle-in-cell (PIC) simulations are performed to determine the origin of sideband and spurious noises generated in a cooker magnetron. A novel simulation technique is used, which introduces cathode emission current nonuniformities. These nonuniformities are due to nonuniform distributions of electric field on a thermionic emission surface, which result from cathode geometry. It is shown that cathode end-caps shape and magnetic pole-piece geometries are the causes of sideband and spurious noises in conventional microwave ovens. The 3-D simulation results are in satisfactory agreement with the spectrum of a typical cooker magnetron. © 1963-2012 IEEE.