US5153533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage controlled oscillator
Assignee: GPT Ltd
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Filing: 1991-06-12
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Granted: 1992-10-06
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Expires: 2011-06-12
Abstract
Abstract A voltage-controlled oscillator using planar microstrip technology and primarily for the 37 to 39.5 GHz frequency band comprises a strip-line resonator, a negative resistance device mounted adjacent the center of the resonator, respective variable capacitance devices mounted adjacent the ends of the resonator, a high impedance coupling the resonator to an output path, and bias signals are applied to the negative resistance device and said variable capacitance devices.
Inventors
- 👤 Kevin Lamacraft
- 👤 Kenneth Elder
- 👤 Christopher D. Howson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:22
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/141; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
101 words
A broad band, tunable, voltage-controlled oscillator comprising: a strip-line resonator having a center and opposite ends, a negative resistance device mounted adjacent the center of said resonator, a pair of variable capacitance tuning devices respectively mounted in series with the ends of said resonator, high impedance means coupling said resonator to an output path, means for applying a direct current bias signal to said negative resistance device via said output path, and means for applying direct current bias signals to said variable capacitance devices to vary their capacitance and tune the oscillator over a tuning bandwidth of at least two GHz.
Claim 2
Dependent Claim
101 words
A broad band, tunable, voltage-controlled oscillator comprising: a strip-line resonator having a center and opposite ends, a negative resistance device mounted adjacent the center of said resonator, a pair of variable capacitance tuning devices respectively mounted in series with the ends of said resonator, high impedance means coupling said resonator to an output path, means for applying a direct current bias signal to said negative resistance device via said output path, and means for applying direct current bias signals to said variable capacitance devices to vary their capacitance and tune the oscillator over a tuning bandwidth of at least two GHz.
Claim 3
Dependent Claim
16 words
An oscillator as claimed in claim 1 wherein the negative resistance device comprises a Gunn diode.
Claim 4
Dependent Claim
24 words
An oscillator as claimed in claim 1, wherein the bias signal for said negative resistance device is applied by way of a band-stop filter.
Claim 5
Dependent Claim
24 words
An oscillator as claimed in claim 1, wherein the bias signals for said variable capacitance devices are applied by way of respective band-stop filters.
Claim 6
Dependent Claim
24 words
An oscillator as claimed in claim 1, wherein the high impedance means is connected into an output waveguide by way of an E-plane transition.
Claim 7
Dependent Claim
116 words
A strip-line oscillator for broad band operation at wavelengths of the order of millimetres comprising: a length of strip-line having a center and opposite ends, a negative resistance device mounted adjacent the center of said length of strip-line, a pair of variable capacitance tuning devices respectively mounted in series with the ends of said length of strip-line, high impedance means coupling said length of strip-line to an output path, means for applying a direct current bias signal to said negative resistance device via said output path, and means for applying direct current bias signals to said variable capacitance devices to vary their capacitance and tune the oscillator over a tuning bandwidth of at least two GHz.
Claim 8
Dependent Claim
116 words
A strip-line oscillator for broad band operation at wavelengths of the order of millimetres comprising: a length of strip-line having a center and opposite ends, a negative resistance device mounted adjacent the center of said length of strip-line, a pair of variable capacitance tuning devices respectively mounted in series with the ends of said length of strip-line, high impedance means coupling said length of strip-line to an output path, means for applying a direct current bias signal to said negative resistance device via said output path, and means for applying direct current bias signals to said variable capacitance devices to vary their capacitance and tune the oscillator over a tuning bandwidth of at least two GHz.
Claim 9
Dependent Claim
16 words
An oscillator as claimed in claim 6 wherein the negative resistance device comprises a Gunn diode.
Claim 10
Dependent Claim
24 words
An oscillator as claimed in claim 6 wherein the bias signal for said negative resistance device is applied by way of a band-stop filter.
Claim 11
Dependent Claim
24 words
An oscillator as claimed in claim 6 wherein the bias signals for said variable capacitance devices are applied by way of respective band-stop filters.
Claim 12
Dependent Claim
24 words
An oscillator as claimed in claim 6 wherein the high impedance means is connected into an output waveguide by way of an E-plane transition.
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) | 1995-10-06 | 1996-04-06 | 1996-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-06 | 2000-04-06 | 2000-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-06 | 2004-04-06 | 2004-10-06 | $7700.00 | Window Closed / Lapsed |