Tunable bridge circuit

Details Tunable bridge circuit Tunable bridge circuit

2006-03-14

2006-03-14

Ham, Seungsook (Department: 2817)

Wave transmission lines and networks

Coupling networks

Frequency domain filters utilizing only lumped parameters

C333S174000

Reexamination Certificate

active

07012483

ABSTRACT:
A tuning circuit for use in an electrical circuit network is disclosed. The tuning circuit includes a bridge circuit. The bridge circuit comprises a first adjustable capacitance grouping, a second adjustable capacitance grouping and a third adjustable capacitance grouping. Each adjustable capacitance grouping includes at least one tunable capacitor and a bias port. In one embodiment, the tunable capacitor is comprised of a tunable thin-film barium strontium titanate (“BST”) capacitor. A first lead and a second lead couple to, or extend from, the bridge circuit. The leads are configured to couple with a coupling element and a shunt element of the electrical circuit network so that when the leads are grounded, one adjustable capacitance group is grounded and the remaining adjustable capacitance group couple with a bias voltage to appropriately tune the electrical circuit to achieve desired electrical characteristics.

REFERENCES:
patent: 5574413 (1996-11-01), Ruelke
patent: 6441701 (2002-08-01), Hernandez
patent: 6674321 (2004-01-01), York
patent: 6686817 (2004-02-01), Zhu et al.
patent: 6690251 (2004-02-01), Toncich
patent: 2002/0158717 (2002-10-01), Toncich
International Search Report and Written Opinion, PCT/US04/12475, Mar. 28, 2005.

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