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Applications of mm-wave SIS mixers to middle atmosphere monitoring systems

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7 Author(s)
Suzuki, H. ; Fujitsu Labs. Ltd., Atsugi, Japan ; Imamura, T. ; Yokoyama, N. ; Suzuki, M.
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We have already developed a low-noise 100 GHz band (98-115 GHz) SIS mixer using Nb/AlOx/Nb junction technology. The mixer has a noise temperature of 17 K when used as a double sideband (DSB) heterodyne receiver. The SIS receiver has been in use in the 4 m radio telescope at Nagoya University for five years. As a further application of the SIS mixer, we developed middle-atmosphere ozone monitoring system using an SIS mixer for the first time. The system can measure ozone mixing ratio every 5 minutes. The integration time is less than 1/10 of the time needed in a conventional system using Schottky barrier diode (SBD) mixers. We have also begun developing developing a 200 GHz band (210-280 GHz) SIS mixer for radio astronomy and for monitoring other minor constituents such as ClO. The preliminary experiment showed that the mixer has a rather low noise temperature of 60 K (DSB).<>

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Applied Superconductivity, IEEE Transactions on  (Volume:5 ,  Issue: 2 )