Micro Harmonics introduces a new WR-10 cryogenic isolator (75-110 GHz). Typical insertion loss is less than 0.4 dB at 77 K. Typical isolation is greater than 26 dB at 77 K. Nominal insertion loss and isolation are maintained at room temperature at 1.0 dB and 19 dB respectively. Prototypes have been rigorously tested through more than 60 cryogenic cycles to 77 K without failure. Follow this link for more information. Additional models are forthcoming.