The QCY-G0401202 from QuinStar is a Dual Junction Cryogenic Circulator that operates from 4 to 12 GHz. It provides an insertion loss of 0.4 dB with an isolation of 36 dB. The field-displacement device offers exceptional broadband performance down to the mK range. This circulator housing is made of OHFC copper and designed for optimal thermalization. It is available in a module that measures 0.52 (W) 2.76 (L) X 1.4 (H) inches with standard Mµ-metal or double shielding and SMA (M/F) connectors. This cryogenic circulator is suitable for quantum computing, radio astronomy, and particle physics research applications.