US4998077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
VCO having tapered or stepped microstrip resonator
Assignee: Motorola Solutions Inc
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Filing: 1989-12-20
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Granted: 1991-03-05
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Expires: 2009-12-20
Abstract
Abstract A variable characteristic impedance microstrip resonator for use in a tunable oscillator circuit, the resonator having relatively high characteristic impedance near its driven end to maximize tuning range and relatively low characteristic impedance near its opposite end to minimize losses and thus optimize sideband noise performance.
Inventors
- 👤 Peter Nanni
- 👤 Terry K. Mansfield
- 👤 Peter P. Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:34
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1841; H03B5/1847; H03B5/1852
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
In a tunable oscillator circuit incorporating a microstrip resonator as a feedback element, wherein the microstrip resonator is coupled to an active device at a first end and coupled to ground at a second end, an improvement wherein the microstrip resonator comprises: a resonator constructed and arranged to exhibit a characteristic impedance (Z 0 ) which varies along its length, having a relatively high Z 0 near said first end to maximize tuning range, and a relatively low Z 0 near said second end to minimize losses.
Claim 2
Dependent Claim
87 words
In a tunable oscillator circuit incorporating a microstrip resonator as a feedback element, wherein the microstrip resonator is coupled to an active device at a first end and coupled to ground at a second end, an improvement wherein the microstrip resonator comprises: a resonator constructed and arranged to exhibit a characteristic impedance (Z 0 ) which varies along its length, having a relatively high Z 0 near said first end to maximize tuning range, and a relatively low Z 0 near said second end to minimize losses.
Claim 3
Dependent Claim
19 words
The tunable oscillator circuit in accordance with claim 1, wherein the resonator is a stepped microstrip transmission line resonator.
Claim 4
Dependent Claim
20 words
The tunable oscillator circuit in accordance with claim 1, wherein the resonator is a continuously tapered microstrip transmission line resonator.
References Cited (Backward Citations)
US3624554A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |