Cryogenic Isolators for MMW Frequencies
Micro Harmonics developed a line of cryogenic millimeter wave isolators under NASA research contracts that ran from 2019-2021. Cryogenic isolators have been developed in every standard waveguide band from WR-15 (50-75 GHz) to WR-5.1 (140-220 GHz).
Additionally, a line of voltage variable attenuators was developed in the bands WR-15 through WR-10 with plans to develop attenuators in WR-8 and WR-6.5. The attenuators use the physics of Faraday rotation to cover full waveguide bands.