Patent US4990865A successfully refreshed from Google Patents.
US4990865A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transistor microwave oscillator having adjustable zone of potential instability
Assignee: Alcatel Lucent NV
•
Filing: 1990-03-14
•
Granted: 1991-02-05
•
Expires: 2010-03-14
Abstract
Abstract A microwave oscillator having at least one transistor (1), which may be bipolar or otherwise. A tunable reactive circuit (13, 15, 16) suitable for adjusting the transistor's zone of potential instability is inserted in the emitter circuit of the transistor (1) (or in the source circuit of an FET). The reactive circuit comprises a series length of transmission line (13) and a parallel capacitance (15, 16) constituted, at least in part, by a conducting slab (15) of adjustable size.
Inventors
- 👤 Michel Martheli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:51
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1841; H03B5/1847; H03B2200/00; H03B2200/006; H03B2200/0062; H03B2201/00; H03B2201/01; H03B2201/011; H03B2201/012; H03B2201/014; H03B5/1852
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
104 words
A microwave oscillator including at least one transistor (1), characterized in that the bias circuit for the transistor comprises, in the emitter circuit of a bipolar transistor or in the source circuit of a transistor of the FET type, a tunable reactive circuit (13, 15, 16) suitable for adjusting the transistor's zone of potential instability, said tunable reactive circuit being constituted by a length of transmission line (13) connected in series in the bias circuit (13, 14) and by a capacitance (15, 16) connected in parallel from the radiofrequency point of view between ground and the emitter or source electrode of the transistor (1).
Claim 2
Dependent Claim
104 words
A microwave oscillator including at least one transistor (1), characterized in that the bias circuit for the transistor comprises, in the emitter circuit of a bipolar transistor or in the source circuit of a transistor of the FET type, a tunable reactive circuit (13, 15, 16) suitable for adjusting the transistor's zone of potential instability, said tunable reactive circuit being constituted by a length of transmission line (13) connected in series in the bias circuit (13, 14) and by a capacitance (15, 16) connected in parallel from the radiofrequency point of view between ground and the emitter or source electrode of the transistor (1).
Claim 3
Dependent Claim
20 words
A microwave oscillator according to claim 1, characterized in that said capacitance comprises a conducting slab (15) of adjustable size.
Claim 4
Dependent Claim
26 words
A microwave oscillator according to claim 2, characterized in that said capacitance further includes a discrete capacitor (16) connected in parallel with the conducting slab (15).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |