Active RF Circulators

Award Information
Agency: Department of Defense
Branch: Defense Advanced Research Projects Agency
Contract: W31P4Q-06-C-0076
Agency Tracking Number: 05SB2-0273
Amount: $148,986.00
Phase: Phase I
Program: SBIR
Solicitation Topic Code: SB052-016
Solicitation Number: 2005.2
Solicitation Year: 2005
Award Year: 2005
Award Start Date (Proposal Award Date): 2005-11-08
Award End Date (Contract End Date): 2006-07-15
Small Business Information
210 Airport Street, Quonset Point, North Kingstown, RI, 02852
DUNS: 041546834
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 William Weedon
 (401) 295-0062
Business Contact
 William Weedon
Title: President/CEO
Phone: (401) 295-0062
Research Institution
Applied Radar Inc. proposes the development of active MMIC-based circulators in order to achieve high isolation between transmit and receive paths for simultaneous transmit and receive (STAR) phased-array radar system architectures. This technology will enable increased persistence in intelligence, surveillance and reconnaissance (ISR) systems and allow multiple simultaneous radar modes including SAR, GMTI and AMTI. The different pulse widths required by these various radar modes often precludes simultaneous multi-mode radar operation. Previous work in active MMIC circulators in the early 1990's demonstrated the concept of active circulator, but did not achieve the required performance. Recent advances in chip-level RF modeling, advances in device processes and new materials such as SiGe, GaN, and SiC show promise of achieving an active circulator with up to 40 dB of T/R isolation with less than 0.5 dB of loss, while handling 1 Watt or more of CW power. There is also a growing trend towards the integration of multiple RF components in a single chip. The development of a high-performance MMIC-based circulator will enable system-on-a-chip architectures, enabling increased phased-array functionality, while reducing size and cost.

* Information listed above is at the time of submission. *

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