Wave transmission lines and networks – Coupling networks – Frequency domain filters utilizing only lumped parameters
Reexamination Certificate
2000-12-20
2002-10-22
Bettendorf, Justin P. (Department: 2817)
Wave transmission lines and networks
Coupling networks
Frequency domain filters utilizing only lumped parameters
C333S175000, C333S219000
Reexamination Certificate
active
06469596
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention is in the field of electrical components, and in particular relates to composite capacitor/inductor resonant circuits.
2. Description of the Prior Art
Resonant circuits use inductive and capacitive components. Twenty years ago these two components were combined using two coils. A second coil, having a diameter somewhat smaller than a first coil, was partially inserted axially inside the first coil. The inductance of the windings plus the capacitance between the windings was used to develop a series resonant circuit that did not require a separate capacitor. (See A. C. Doty, Jr. et al., “Introducing the Incons,” OST, p. 11-14, February 1979, and U. S. Pat. Nos.3,980,975, 4,128,818, and 4,236,127.)
SUMMARY OF THE INVENTION
A composite capacitor/inductor resonant circuit is described employing alternate layers of conducting annuli and insulating annuli, coaxially positioned. Each annulus has a gap circumferentially positioned to provide a location for the primary inductor switch. The switch is connected to opposing ends of the separate annuli. Conceptually this arrangement forms a parallel plate transmission line with a switch positioned across the opposing ends. At resonance, the distributed circuit behaves as a lumped inductor and capacitor.
REFERENCES:
patent: 4812791 (1989-03-01), Makimoto et al.
patent: 06314917 (1994-11-01), None
A. C. Doty, Jr. et al., “Introducing the Incons,” OST, p. 11-14, Feb. 1979.
Frederick W. Grover, Inductance Calculations: Working Formulas and Tables, Dover, 1962.
Hull Jonathan P.
Scholfield David W.
Bettendorf Justin P.
Callahan Kenneth E.
Skorich James M.
The United States of America as represented by the Secretary of
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