s.  Frequency modulation reflectometer has been developed to measure the plasma density profile of the Korea Superconducting Tokamak Advanced Research tokamak. Three reflectometers are operating in extraordinary polarization mode in the frequency range of Q band (00.0-00 GHz), V band (00-00 GHz), and W band (00-000 GHz) to measure the density up to 0 × 00