US3576499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coaxial cavity transistor oscillator with step recovery diode frequency multiplier
Assignee: EMI Ltd
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Filing: 1969-01-10
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Granted: 1971-04-27
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Expires: 1989-01-10
Abstract
Abstract A microwave oscillator including a transistor connected as an oscillator and coupled to a resonator tuned to a first frequency, line means are coupled to the resonator, a step recovery diode is connected in shunt along the line means and a filter arrangement is provided which is tuned to a harmonic of the above-mentioned first frequency and is coupled to the line means to derive a signal of the harmonic from the step recovery diode.
Inventors
- 👤 Walter Jack Axford
- 👤 Douglas Jacques Wootton
- 👤 Francis Robert Trumble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:00
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/1805; H03B19/00; H03B19/16; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
65 words
A microwave oscillator including a transistor connected as an oscillator and coupled to a resonator tuned to a first frequency, line means coupled to said resonator, a step recovery diode connected in shunt along said line means, and a filter arrangement tuned to a harmonic of said first frequency and coupled to said line means to derive a signal of said harmonic from said diode.
Claim 2
Dependent Claim
65 words
A microwave oscillator including a transistor connected as an oscillator and coupled to a resonator tuned to a first frequency, line means coupled to said resonator, a step recovery diode connected in shunt along said line means, and a filter arrangement tuned to a harmonic of said first frequency and coupled to said line means to derive a signal of said harmonic from said diode.
Claim 3
Dependent Claim
28 words
A microwave oscillator according to claim 1 in which said resonator is connected to the base of the transistor by a capacitor controlling the frequency of the resoNator.
Claim 4
Dependent Claim
53 words
A microwave oscillator according to claim 1 in which said line means is a coaxial line, forming a capacitance with the wall of the resonator said capacitance being associated with said diode so as to reduce the inductance introduced by the diode at the frequency of the oscillations produced by said transistor oscillator.
Claim 5
Dependent Claim
40 words
A microwave oscillator according to claim 1 in which said line means is a coaxial line and includes a radial transmission line portion having a susceptance such as to reduce the inductance introduced by said diode at the output frequency.
Claim 6
Dependent Claim
47 words
A microwave oscillator according to claim 1 in which said line means is a coaxial line and the center conductor is connected via pickup means to a variable capacitor within the resonator and connected thereto so as to provide matching between said transistor oscillator and said diode.
Claim 7
Dependent Claim
38 words
A microwave oscillator according to claim 1 wherein a varactor diode is connected in the collector-emitter circuit of said transistor oscillator whereby the frequency of said transistor oscillator is made dependent on the voltage applied to said varactor.
Claim 8
Dependent Claim
59 words
A microwave oscillator comprising a transistor connected as an oscillator and disposed on the wall of a closed hollow resonator for said oscillator and tuned to a first frequency, a cavity filter tuned to a harmonic of said first frequency, coupling means coupling the resonator to said filter and a step recovery diode in shunt with said coupling means.
Claim 9
Dependent Claim
59 words
A microwave oscillator comprising a transistor connected as an oscillator and disposed on the wall of a closed hollow resonator for said oscillator and tuned to a first frequency, a cavity filter tuned to a harmonic of said first frequency, coupling means coupling the resonator to said filter and a step recovery diode in shunt with said coupling means.
Claim 10
Dependent Claim
43 words
A microwave oscillator according to claim 7 in which a tubular metal member projects into the resonator from one wall thereof and carries at its free end a capacitor which is connected to the tubular member and to the base of the transistor.
Claim 11
Dependent Claim
51 words
A microwave oscillator according to claim 7 in which said coupling means is a coaxial line from within said hollow resonator to within said cavity filter, the end of the inner conductor within said resonator having a flange which overlies dielectric material provided on an inner wall surface of said resonator.
Claim 12
Dependent Claim
16 words
A microwave oscillator according to claim 7, said hollow resonator being filled with foamed plastics material.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |