Abstract
In this paper, a Ka-band sheet-beam extended interaction oscillator (EIO) operating at $\mathbf{TM}_{\pmb{31}}$ is designed, which combines the advantages of the sheet beam and higher order mode to generate high power radiation in millimeter wave. The field distribution and output power are analyzed to show the potential of the $\mathbf{TM}_{\pmb{31}}$ mode associated with the sheet beam technology in obtaining high power. The characteristic impedance is optimized to make an effective beam-wave interaction. To demonstrate its capability, a rectangular sheet beam with a width-to-height of $\pmb{8}\mathbf{mm}\times \pmb{1}$ mm is injected in the EIO to simulate the beam-wave interaction. Simulation results show that the oscillator generates a millimeter-wave power of 81.6 kW with a beam current of 12A, a beam voltage of 30 kV. The frequency of the output millimeter wave is 35.25 GHz.
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