PT Unknown
AU Cherednichenko, S
   Kroug, M
   Khosropanah, P
   Adam, A
   Merkel, H
   Kolberg, E
   Loudkov, D
   Voronov, B
   Gol'tsman, G
   Richter, H
   Hübers, HW
TI A broadband terahertz heterodyne receiver with an NbN HEB mixer
SE Proc. 13[super:th] Int. Symp. Space Terahertz Technol.
PY 2002
BP 85
EP 95
DE NbN HEB mixers
AB We present a broadband and low noise heterodyne receiver for 1.4-1.7 THz designed for the Hershel Space Observatory. A phonon- cooled NbN HEB mixer was integrated with a normal metal double- slot antenna and an elliptical silicon lens. DSB receiver noise temperature Tr was measured from 1 GHz through 8GHz intermediate frequency band with 50 MHz instantaneous bandwidth. At 4.2 K bath temperature and at 1.6 THz LO frequency Tr is 800 K with the receiver noise bandwidth of 5 GHz. While at 2 K bath temperature Tr was as low as 700 K. At 0.6 THz and 1.1 THz a spiral antenna integrated NbN HEB mixer showed the receiver noise temperature 500 K and 800 K, though no antireflection coating was used in this case. Tr of 1100 K was achieved at 2.5 THz while the receiver noise bandwidth was 4 GHz.
PI Cambridge, MA, USA
ER