TY  - ABST
AU  - Semenov, Alexei D.
AU  - Hübers, Heinz-Wilhelm
AU  - Richter, Heiko
AU  - Smirnov, Konstantin
AU  - Gol'tsman, Gregory N.
AU  - Voronov, Boris M.
PY  - 2004
DA  - 2004//
TI  - Superconducting hot-electron bolometer mixer for terahertz heterodyne receivers
T2  - Proc. 15[super:th] Int. Symp. Space Terahertz Technol.
BT  - Proc. 15[super:th] Int. Symp. Space Terahertz Technol.
SP  - 164
KW  - NbN HEB mixers
AB  - A number of on-going astronomical and atmospheric research programs are aimed to the Terahertz (THz) spectral region. At frequencies above about 1.4 THz heterodyne receivers planned for these missions will use superconducting hot-electron bolometers as a mixers. We present current results on the development of superconducting NbN hot- electron bolometer mixer and quasioptical radiation coupling scheme for GREAT (German Receiver for Astronomy at Terahertz Frequencies, to be used aboard of SOFIA) and TELIS (Terahertz Limb Sounder). The mixer is incorporated into hybrid antenna consisting of a planar feed antenna, which has either logarithmic spiral or double-slot configuration, and hyperhemispherical silicon lens. For the log-spiral feed antenna, the double side-band receiver noise temperature of 5500 K was achieved at 4.3 THz. The noise temperature shows less than 3 dB increase in the intermediate frequency band from 4 GHz to 7 GHz. The hybrid antenna had almost frequency independent and symmetric radiation pattern with the beam-width slightly broader than expected for a diffraction limited pattern. Results of FTS measurements in the direct detection regime agreed with the spectral dependence of the noise temperature for spiral antennas with different spacing of inner terminals.
UR  - https://www.nrao.edu/meetings/isstt/2004.shtml
N1  - exported from refbase (https://db.rplab.ru/refbase/show.php?record=1492), last updated on Tue, 18 May 2021 12:46:33 -0500
ID  - Semenov_etal2004
ER  -