PT Unknown
AU Gao, JR
   Hiajenius, M
   Yang, ZQ
   Klapwijk, TM
   Miao, W
   Shi, SC
   Voronov, B
   Gortsman, G
TI Direct comparison of the sensitivity of a spiral and a twin-slot antenna coupled HEB mixer at 1.6 THz
SE Proc. 17[super:th] Int. Symp. Space Terahertz Technol.
PY 2006
BP 59
EP 62
DE NbN HEB mixers
AB To make a direct comparison of the sensitivity between a spiral and a twin slot antenna coupled HEB mixer, we designed both types of mixers and fabricated them in a single processing run and on the same wafer. Both mixers have similar dimensions of NbN bridges (1.5-2 pm x0.2 pm). At 1.6 THz we obtained a nearly identical receiver noise temperature from both mixers (only 5% difference), which is in a good agreement with the simulation based on semi analytical models for both antennas. In addition, by using a bandpass filter to reduce the direct detection effect and lowering the bath temperature to 2.4 K, we measured the lowest receiver noise temperature of 700 K at 1.63 THz using the twin-slot antenna mixer.
ER