TY  - JOUR
AU  - Semenov, A. D.
AU  - Hübers, Heinz-Wilhelm
AU  - Richter, H.
AU  - Birk, M.
AU  - Krocka, M.
AU  - Mair, U.
AU  - Vachtomin, Yu B.
AU  - Finkel, M. I.
AU  - Antipov, S. V.
AU  - Voronov, B. M.
AU  - Smirnov, K. V.
AU  - Kaurova, N. S.
AU  - Drakinski, V. N.
AU  - Gol'tsman, G. N.
PY  - 2003
DA  - 2003//
TI  - Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers
JO  - IEEE Trans. Appl. Supercond.
SP  - 168
EP  - 171
VL  - 13
IS  - 2
KW  - NbN HEB mixers
AB  - We present recent results showing the development of superconducting NbN hot-electron bolometer mixer for German receiver for astronomy at terahertz frequencies and terahertz limb sounder. The mixer is incorporated into a planar feed antenna, which has either logarithmic spiral or double-slot configuration, and backed on a silicon lens. The hybrid antenna had almost frequency independent and symmetric radiation pattern slightly broader than expected for a diffraction limited antenna. At 2.5 THz the best 2200 K double side-band receiver noise temperature was achieved across a 1 GHz intermediate frequency bandwidth centred at 1.5 GHz. For this operation regime, a receiver conversion efficiency of -17 dB was directly measured and the loss budget was evaluated. The mixer response was linear at load temperatures smaller than 400 K. Implementation of the MgO buffer layer on Si resulted in an increased 5.2 GHz gain bandwidth. The receiver was tested in the laboratory environment by measuring a methanol emission line at 2.5 THz.
UR  - https://doi.org/10.1109/TASC.2003.813672
DO  - 10.1109/TASC.2003.813672
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=343), last updated on Tue, 18 May 2021 12:41:52 -0500
ID  - Semenov_etal2003
ER  -