Millimeter-wave Hybrid Circulators
Micro Harmonics has been awarded a NASA Phase I SBIR contract for the development of an all new hybrid circulator for millimeter-wave (MMW) applications. The contract runs from July 2020 through December 2020. In the MMW, the dominant circulator topology is the Y-junction. There are very few commercial Y-junction circulators available above 100 GHz and those tend to have bandwidths near 1-2 GHz. Our hybrid circulator is not a Y-junction and can in theory cover a full rectangular waveguide band (e.g. 110-170 GHz) with inherently high isolation between the Tx and Rx ports. The initial prototype will be designed to cover the band from 150 GHz to 200 GHz. A provisional patent has been filed.
Cryogenic Isolators for MMW Frequencies
Micro Harmonics has been awarded a NASA Phase II SBIR contract for the development of cryogenic millimeter wave isolators. The contract runs June 2019 through June 2021. Cryogenic isolators will be developed in every standard waveguide band from WR-15 (50-75 GHz) to WR-3.4 (220-330 GHz). A line of voltage variable attenuators will also be developed in the bands WR15 through WR-8. The attenuators use the physics of Faraday rotation to cover full waveguide bands.
MMW Isolators with Ultra-Low Loss
Micro Harmonics developed a line of ultra-low insertion loss isolators under NASA research contracts that ran from 2015-2018. The isolators cover full waveguide bands from WR28 (26-40 GHz) through WR-3.4 (220-330 GHz). They have the lowest insertion loss in the industry with less than 2 dB in the WR-3.4 band. Our isolators also have the industry’s smallest form factor. They employ diamond heat spreaders for improved power handling and are resistant to stray magnetic fields. We are currently working on designs to extend this line to the WR-2.8 (260-400 GHz) and WR-2.2 (330-500 GHz) bands.