摘要：The Q-band （33-50 GHz） fast sweep frequency modulated continuous wave （FMCW） reflectometry has been recently developed for electron density profile measurement on the Joint TEXT tokamak. It operates in ordinary mode （O-mode） with a 20 μs sweeping period, covering the density range from 1 × 10^19m 3 to 3 × 10^19m-3. On the bench test, a Yttrium Iron Garnet （YIG） filter is used for the dynamic calibration of the voltage controlled oscillator （VCO） to obtain a linear frequency sweep. Besides, the use of a power combiner helps to improve the sideband suppression level of the single side-band modulator （SSBM）. The reconstructed density profiles are presented, which demonstrate the capability of the reflectometry.