A new compact low-loss fast phase-shift high-power microwave (HPM) phase shifter (PS) is proposed, designed, and cold and high-power tested. Firstly, based on solving the scattering matrix and eigenvectors, we design a novel HPM dual circular polarizer, and then a dumbbell-like metal plug driven by a highspeed servomotor is used to slide a short circuit along the dual circular polarized port to adjust the output RF phase, which varies 180 by moving the plug with a quarter of the guided wavelength. The X-band PS has a total length of 9.5 cm and a power capacity achieved 300 MW at 30-ns HPM pulse. A fast phase shift of 310 was achieved within 0.1 s in test, a high precision of phase shift 1 can be realized, and the tested insertion loss was 0.15 dB.Index Terms-High power microwave (HPM), phase shifter (PS).
The application of a resonant magnetic field to suppress the multipactor at the vacuum/dielectric interface of a high-power microwave window was theoretically proposed by Chang et al. [Appl. Phys. Lett. 96, 111502 (2010)] and the proof-of-principle was experimentally demonstrated by Chang et al. [Appl. Phys. Lett. 97, 141501 (2010)]. However, for transmitting gigawatt power, conventional large-scale magnets have the significant drawback of a nonuniform and heterogeneous B-field, which enhances the multipactor rather than suppresses it. The Halbach-like magnets for generating the transverse homogeneous B-field in a large scale are studied for suppressing the multipactor; the underlying physics in the particle-in-cell simulation was simulated, and the window breakdown threshold was significantly enhanced at multi-gigawatt.
An ultra compact 4-way high-power microwave (HPM) waveguide combiner to realize coherent microwave combination was theoretically designed and proof-of-principle experimentally tested. The theoretical and experimental S-parameters are basically consistent with each other, and the multi-channels of HPM combiner are effectively isolated with each other to avoid the inter-modulating among the HPM sources. The C-band HPM experiment was carried out, and the power capacity of the HPM combiner was demonstrated to reach multi-gigawatts.
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