BROAD-BAND 230GHZ FINLINE MIXER FOR ASTRONOMICAL IMAGING ARRAYS

The authors report the successful operation of an antipodal finline qu asi-particle SIS mixer at 230GHz. The mixer is fed by a waveguide diag onal horn and uses planar circuit technology and integrated tuning. Th e mixer is testd over the frequency range 213-265 GHz and a receiver n oise temperature of similar to 60K DSB over the whole of this range is obtained. This work has shown that superconducting finline mixers hav e low noise and are easy to manufacture, and are therefore suitable fo r large-format imaging arrays.