Wave transmission lines and networks – Coupling networks – Delay lines including long line elements
Reexamination Certificate
2007-08-21
2007-08-21
Lee, Benny T. (Department: 2817)
Wave transmission lines and networks
Coupling networks
Delay lines including long line elements
C333S156000
Reexamination Certificate
active
10906626
ABSTRACT:
The present invention provides a method and apparatus for a monolithic device utilizing cascaded, switchable slow-wave CPW sections that are integrated along the length of a planar transmission line. The purpose of the switchable slow-wave CPW sections elements is to enable control of the propagation constant along the transmission line while maintaining a quasi-constant characteristic impedance. The device can be used to produce true time delay phase shifting components in which large amounts of time delay can be achieved without significant variation in the effective characteristic impedance of the transmission line, and thus also the input/output return loss of the component. Additionally, for a particular value of return loss, greater time delay per unit length can be achieved in comparison to tunable capacitance-only delay components.
REFERENCES:
patent: 5369381 (1994-11-01), Gamand
patent: 6133807 (2000-10-01), Akiyama et al.
patent: 6559737 (2003-05-01), Nagra et al.
patent: 2003/0146806 (2003-08-01), Nuecther et al.
Lakshminarayanan Balaji
Weller Thomas
Lee Benny T.
Sauter Molly L.
Smith & Hopen , P.A.
University of South Florida
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