Active RF Circulators

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: W31P4Q-07-C-0006
Agency Tracking Number: 05SB2-0273
Amount: $2,249,700.00
Phase: Phase II
Program: SBIR
Awards Year: 2007
Solicitation Year: 2005
Solicitation Topic Code: SB052-016
Solicitation Number: 2005.2
Small Business Information
APPLIED RADAR, INC.
210 Airport Street, North Kingstown, RI, 02852
DUNS: 041546834
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 William Weedon
 President/CEO
 (401) 295-0062
 whw@appliedradar.com
Business Contact
 William Weedon
Title: President/CEO
Phone: (401) 295-0062
Email: whw@appliedradar.com
Research Institution
N/A
Abstract
The development of broadband high-isolation active circulators with simultaneous transmit and receive (STAR) capabilities would enable increased persistence in intelligence, surveillance and reconnaissance (ISR) systems and allow multiple simultaneous radar modes including SAR, GMTI and AMTI for global and local multifunction and multi-task operations. Previous works in MMIC active circulators demonstrated the concept and feasibility to realize the devices with stringent design requirements in order to achieve broadband and high isolation operation. Various active circulator configurations which are capable of STAR applications have been studied in our Phase I R&D, including a compilation of desired specifications for STAR radar application. The Phase I investigation also considered available device technologies and substrate materials in terms of power handling, frequency, bandwidth, isolation and interface matching. The Phase II effort will extend this work to implement and realize a broadband high-isolation active circulator with STAR and MMIC capabilities. The proposed work will include a trade-space study on the performance sensitivity of the active circulator based on power-to-noise and bandwidth-to-isolation requirements, development of active matching circuitry at antenna interface, development of feedforward cancellation circuits, final selection of foundry technology for device fabrication in terms of high power and low noise Figure (NF) applications, and finally device fabrication and testing. The development of a high-performance MMIC-based circulator will enable system-on-a-chip architectures with high isolation over a relatively wide bandwidth, while minimizing size and cost for phased array radar application.

* information listed above is at the time of submission.

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