Oversized W-band 2D periodic lattice oscillator

Cross, A. W. and MacLachlan, A. J. and Robertson, C. W. and Zhang, L. and Donaldson, C. R. and Yin, H. and Phelps, A. D. R. and Ronald, K. (2019) Oversized W-band 2D periodic lattice oscillator. In: 2019 International Vacuum Electronics Conference (IVEC). IEEE, Piscataway, N.J.. ISBN 978-1-5386-7534-2

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    Abstract

    To mitigate the conventional scaling of slow-wave vacuum electronic oscillators, in which the maximum output power reduces as the frequency increases, an oversized cylindrical structure is driven by an annular electron beam. To enhance mode selectivity a two dimensional (2D) periodic lattice structure (PSL) is used. The 2D PSL consists of shallow periodic cosinusoidal perturbations in both the azimuthal and axial directions on the inner wall of a cylindrical waveguide. Analytical theory and numerical PIC simulations have been used to design the W-band oscillator that has been constructed. The ratio of the diameter of the cylindrical cross-section of the structure to the operating wavelength is ~5. The performance of this oscillator is being measured and compared with the predictions of the numerical simulations.