Rapidly Tunable Niobium Notch Filters

Award Information
Agency: Department of Defense
Branch: Navy
Contract: N00014-08-M-0214
Agency Tracking Number: N081-083-0668
Amount: $99,963.00
Phase: Phase I
Program: SBIR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: N08-083
Solicitation Number: 2008.1
Small Business Information
175 Clearbrook Road, Elmsford, NY, 10523
DUNS: 103734869
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 Deepnarayan Gupta
 VP Research and Development
 (914) 592-1190
 gupta@hypres.com
Business Contact
 Edward Kulinski
Title: VP Finance and Administration
Phone: (914) 592-1190
Email: ekulinski@hypres.com
Research Institution
N/A
Abstract
A major problem limiting broadband digital receivers is the presence of interference signals that saturate the analog-to-digital converter (ADC). This problem can be alleviated using analog notch filters that block these interferers before digitization, provided the notch filters can be adaptively tuned to follow rapidly shifting interferers. Superconducting thin-film filters offer superior notch rejection combined with little insertion loss outside the notch. HYPRES has developed a superconducting broadband digital-RF receiver mounted on a reliable 4K cryocooler. It is natural to combine this niobium (Nb) digital technology with a Nb-based superconducting filter technology, since they can readily be fabricated and integrated together into the same cryogenic assembly. HYPRES proposes to design, simulate, and eventually fabricate and test filter banks consisting of multiple Nb notch filters, which may be rapidly tuned across the relevant RF band. This will be carried out in collaboration with the University of Waterloo. Tuning mechanisms will be based on either of two approaches: current-biased Josephson junctions, and voltage-biased microelectromechanical (MEMS) capacitors. It is anticipated that both approaches may lead to high-Q notch filters in the 2 GHz range that may be tuned ~20% on microsecond times. The filters will also be examined for linearity and power-handling.

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

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