PT Journal AU Vakhtomin, YB Finkel, MI Antipov, SV Smirnov, KV Kaurova, NS Drakinskii, VN Voronov, BM Gol’tsman, GN TI The gain bandwidth of mixers based on the electron heating effect in an ultrathin NbN film on a Si substrate with a buffer MgO layer SO J. of communications technol. & electronics JI J. of communications technol. & electronics PY 2003 BP 671 EP 675 VL 48 IS 6 DE NbN HEB mixers AB Measurements of the intermediate frequency band 900 GHz of mixers based on the electron heating effect (EHE) in 2-nm- and 3.5-nm-thick superconducting NbN films sputtered on MgO and Si substrates with buffer MgO layers are presented. A 2-nm-thick superconducting NbN film with a critical temperature of 9.2 K has been obtained for the first time using a buffer MgO layer. ER