Intrinsic mixing behavior of superconducting NbTiN hot electron bolometer mixers based on in situ technique

► We present the measured and simulated results for 0.8 and 1.5 THz waveguide NbTiN HEB mixers. ► The measured and calculated current-voltage curves are in good agreement. ► The modeled intrinsic mixer noise temperature has slight difference from the measured results. ► The calculated and measured results show the two cooling mechanism work together.