A low-noise double-dipole antenna SIS mixer at 1 THz

Abstract A quasi-optical mixer employing a Nb/Al/AlOx/Nb twin-SIS junction with a NbTiN/SiO2/Al microstrip coupling circuit is tested at 800–1000 GHz. The receiver noise temperature TRX=250 K (DSB) is measured at 935 GHz for the bath temperature 2 K at IF=1.5 GHz; TRX remains below 350 K within the frequency range 850–1000 GHz. The integrated lens-antenna demonstrated good beam symmetry with sidelobes below −16 dB.

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