PT Unknown AU Antipov, SV Vachtomin, YB Maslennikov, SN Smirnov, KV Kaurova, NS Grishina, EV Voronov, BM Goltsman, GN TI Noise performance of quasioptical ultrathin NbN hot electron bolometer mixer at 2.5 and 3.8 THz SE Proc. 5-th MSMW PY 2004 BP 592 EP 594 VL 2 DI 10.1109/MSMW.2004.1346031 DE NbN HEB mixers AB To put space-based and airborne heterodyne instruments into operation at frequencies above 1 THz the superconducting NbN hot-electron bolometer (HEB) will be incorporated into heterodyne receiver as a mixer. At frequencies above 1.3 THz the sensitivity of the NbN HEB mixers outperform the one of the Schottky diodes and SIS-mixers, and the receiver noise temperature of the NbN HEB mixers increase with frequency. In this paper we present the results of the noise temperature measurements within one batch of NbN HEB mixers based on 3.5 mn thick superconducting NbN film grown on Si substrate with MgO buffer layer at the LO frequencies 2.5 THz and 3.8 THz. PI Kharkov, Ukraine ER