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March 23, 2014

Mtg: Non-Foster Circuits for Antenna Applications: Theory and Design

by @ 4:38 pm. Filed under ALL, Communications, Electronics Design

THURSDAY April 17, 2014
SCV Antennas and Propagation, with Microwave Theory and Techniques Chapter
– negative-Z, stability, loading, matching, praticality …
Speaker: Steve Stearns, Technical Fellow, Northrop Grumman Information Systems
Time: Food and beverages at 6:00 PM; Presentation at 6:30 PM
Cost: none
Place: Agilent Technologies, 5301 Stevens Creek Blvd., Santa Clara
RSVP: not required

Non-Foster networks are active networks that use negative capacitors and negative inductors in addition to traditional passive lumped elements.  Interest in non-Foster networks has been growing during the past decade for applications such as antenna loading and matching and making active metamaterials.  Such networks are not subject to the Bode/Fano bound on match bandwidth.  Network synthesis procedures have been found that, in principle, give infinite match bandwidth for arbitrary load impedance functions.  Long-standing problems in linear circuit stability theory have been resolved .  Non-Foster counterexample circuits have been found that demonstrate certain classical linear circuit stability tests or criteria are fundamentally incorrect.  In this talk we demonstrate that a networks made from a small class of circuit elements can exhibit non-Foster behavior even if non-Foster elements are not allowed.  In other words, negative capacitors and negative inductors are not necessary base elements for creating non-Foster behavior.  Novel active non-Foster match networks for monopole and loop antennas will be described.


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