NASA SBIR 2020-I Solicitation

Proposal Summary


PROPOSAL NUMBER:
 20-1- S1.02-6080
SUBTOPIC TITLE:
 Technologies for Active Microwave Remote Sensing
PROPOSAL TITLE:
 Broadband Millimeter-Wave Hybrid Circulators for NASA Missions
SMALL BUSINESS CONCERN (Firm Name, Mail Address, City/State/Zip, Phone)
Micro Harmonics Corporation
20 South Roanoke Street, Suite 202
Fincastle, VA 24090
(540) 473-9983

Principal Investigator (Name, E-mail, Mail Address, City/State/Zip, Phone)

Name:
David Porterfield
E-mail:
david48@mhc1.com
Address:
20 South Roanoke Street, Suite 202 Fincastle, VA 24090 - 3102
Phone:
(434) 409-4044

Business Official (Name, E-mail, Mail Address, City/State/Zip, Phone)

Name:
Diane Kees
E-mail:
Diane@mhc1.com
Address:
20 South Roanoke Street, Suite 202 Fincastle, VA 24090 - 3102
Phone:
(540) 473-9983
Estimated Technology Readiness Level (TRL) :
Begin: 2
End: 4
Technical Abstract (Limit 2000 characters, approximately 200 words)

Y-junction circulators are used to direct signal flow in millimeter-wave (MMW) transmit/receive systems including radar and high speed data links. At the heart of the device is a ferrite core located at the junction of three waveguides. The magnetically biased ferrite is non-reciprocal which gives rise to the unique circulator behavior. Circulators are available with full waveguide band operation up to 40 GHz, although the isolation is generally less than 16 dB. At higher frequencies the bandwidth is severely limited by the ferrite material properties. Y-junction circulators operating between 50-90 GHz typically have bandwidths near 2 GHz and above 100 GHz the bandwidth is only 1 GHz, making them unsuitable for many systems.

What is needed is an all-new approach to the problem. We propose a novel hybrid circulator comprising an orthomode transducer (OMT) and a modified Faraday rotation isolator. These two devices can be combined to form a hybrid circulator that can operate with very high isolation over nearly full rectangular waveguide bands. Circulators with this level of performance simply do not exist in the commercial market. The hybrid circulator is thus an enabling technology, offering significantly improved performance over the current state-of-the-art. At the end of the Phase I contract, we will deliver a prototype hybrid circulator covering the 150-190 GHz band to NASA. This component will find application in NASA G-band radar systems designed for future cloud, water, and precipitation missions.

Micro Harmonics is uniquely qualified to carry out this research. We have demonstrated the accuracy of our ferrite models through previous highly successful NASA SBIR contracts. We currently produce the most advanced Faraday rotation isolators on the global market with insertion loss less than 2 dB in the WR-3.4 band 220-330 GHz. We are extending coverage to 500 GHz. With the proposed SBIR funding we have an opportunity to transform the MMW circulator technology.

Potential NASA Applications (Limit 1500 characters, approximately 150 words)

Broadband, hybrid MMW circulators should find immediate use in a wide range of NASA instruments including G-Band radar for measuring microphysical properties of clouds and upper atmospheric constituents as well as airborne science systems such as NASA Cloud Radar System (CRS) high altitude aircraft and APR-3 precipitation radar. Our initial prototype will cover the band 150-190 GHz and thus meet the needs of NASA G-band (167-175 GHz) remote sensing radars designed for future cloud, water, and precipitation missions.

Potential Non-NASA Applications (Limit 1500 characters, approximately 150 words)

Broadband hybrid millimeter-wave circulators are useful in many high-frequency transmit/receive systems including high speed data links and radar. Military applications include battlefield radar, compact range radar, imaging systems, covert communications, and chemical and bio-agent detection. Commercial applications include 5G/6G backhaul radios, airport radar and aeronautic vision enhancement.

Duration: 6

Form Generated on 06/29/2020 21:01:38