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The performances of developed mixers across the atmospheric windows in THz region

Image Credit: M. J. Wang

The performances of developed SIS mixers for KVN, SMA, and ALMA band-10 mixers. The noise of receiver, tested in lab, includes the noise contribution of IF chain of 10K.

Building on the experience of the SMA project, we have developed our own expertise in the instrumentation of sensitive radio-wave receivers. Our routine work involve projects in the area of cryogenics, quasi-optics, microwave and mm-wave devices, analog and digital electronics, precision mechanical design and machining. In particular, we have been in pursuit of two important topics to be our core technologies─superconductor-insulator-superconductor (SIS) junction design and fabrication, and complex receiver system design and integration. We have established stable Nb-based SIS mixer fabricating process. High performance SIS mixers covering frequency range of 100-900 GHz have been developed.