US3596204A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tunable coaxial cavity semiconductor negative resistance oscillator
Assignee: Varian Medical Systems Inc
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Filing: 1969-07-02
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Granted: 1971-07-27
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Expires: 1989-07-02
Abstract
Abstract A microwave oscillator circuit is disclosed which employs a series connection of a lumped element capacitor and a semiconductor device capable of exhibiting negative resistance. The capacitance of the capacitor is series resonated with its self inductance to form the principal frequency determinative element of the resonance circuit, whereby broadband tuning is achieved with a relatively simple and thus inexpensive resonator circuit.
Inventors
- 👤 Arthur B Vane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:34
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/145; H03B7/00; H03B7/02; H03B7/06; H03B7/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A microwave oscillator circuit tunable for operation within a certain frequency range of interest, comprising conductive means forming a cylindrical cavity, means for extracting microwave energy from said cavity and, coaxially mounted within said cavity and electrically connected between the end walls thereof in series circuit relation, a negative resistance semiconductor device and a variable capacitor, said capacitor having at least a pair of axially interdigitated coaxially disposed cylindrical conductors which are axially translatable relative to each other to vary the capacitance of said capacitor, said interdigitated cylindrical conductors being dimensioned and positioned relative to one another such that the capacitance of said capacitor can be tuned to resonance with the self-inductance of said capacitor at any frequency within said range by axial translation of said cylindrical conductors.
Claim 2
Dependent Claim
128 words
A microwave oscillator circuit tunable for operation within a certain frequency range of interest, comprising conductive means forming a cylindrical cavity, means for extracting microwave energy from said cavity and, coaxially mounted within said cavity and electrically connected between the end walls thereof in series circuit relation, a negative resistance semiconductor device and a variable capacitor, said capacitor having at least a pair of axially interdigitated coaxially disposed cylindrical conductors which are axially translatable relative to each other to vary the capacitance of said capacitor, said interdigitated cylindrical conductors being dimensioned and positioned relative to one another such that the capacitance of said capacitor can be tuned to resonance with the self-inductance of said capacitor at any frequency within said range by axial translation of said cylindrical conductors.
Claim 3
Dependent Claim
41 words
The apparatus of claim 1 further including an electrical lead extending insulatedly through a cylindrical wall of said cavity means and connected to the juncture of said semiconductor device and said capacitor for applying a bias potential to said semiconductor device.
Claim 4
Dependent Claim
16 words
The apparatus of claim 1 wherein said semiconductor negative resistance device is a bulk effect diode.
Claim 5
Dependent Claim
15 words
The apparatus of claim 3 wherein said bulk effect diode is a Gunn effect diode.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |