Patent US5144268A successfully refreshed from Google Patents.
US5144268A
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Bandpass filter utilizing capacitively coupled stepped impedance resonators
Assignee: General Dynamics Mission Systems Inc
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Filing: 1991-06-20
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Granted: 1992-09-01
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Expires: 2011-06-20
Abstract
Abstract A bandpass filter which lends itself to applications in the 500 megahertz to 1 gigahertz region. The filter utillizes the capacitively coupled bandpass filter as a model in the design process, but replaces the lumped element inductor/capacitor resonators with distributed stepped impedance resonators.
Inventors
- 👤 John H. Weidman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:30
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/203; H01P1/20327; H01P1/20336; H01P1/20354; H01P1/20381; H03; H03H; H03H7/00; H03H7/01; H03H7/0123
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A microstrip medium bandpass filter comprising: a plurality of lumped element capacitor means; a plurality of distributed microstrip stepped impedance resonator means wherein each of said plurality of distributed microstrip stepped impedance resonator means comprises: first and second transmission line means of diverse impedance and of equal length; said first transmission line means coupled to said plurality of lumped element capacitor means; said first and second transmission line means coupled to each other in series; said second transmission line means coupled to an electric ground; and said plurality of distributed microstrip stepped impedance resonator means coupled in parallel to each other by said plurality of lumped element capacitor means.
Claim 2
Dependent Claim
109 words
A microstrip medium bandpass filter comprising: a plurality of lumped element capacitor means; a plurality of distributed microstrip stepped impedance resonator means wherein each of said plurality of distributed microstrip stepped impedance resonator means comprises: first and second transmission line means of diverse impedance and of equal length; said first transmission line means coupled to said plurality of lumped element capacitor means; said first and second transmission line means coupled to each other in series; said second transmission line means coupled to an electric ground; and said plurality of distributed microstrip stepped impedance resonator means coupled in parallel to each other by said plurality of lumped element capacitor means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |