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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).

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