US3882419A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Varactor tuned impatt diode microwave oscillator
Assignee: RCA Corp
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Filing: 1974-03-01
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Granted: 1975-05-06
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Expires: 1994-03-01
Abstract
Abstract A waveguide section having a moveable short-circuiting piston at one end contains two electrically coupled cavity resonators. A microwave generating element is disposed within one of the cavity resonators and a variable reactance element is disposed within the other cavity resonator. The frequency of the microwave output is controlled by varying the reactance of the variable reactance element.
Inventors
- 👤 George Allan Swartz
- 👤 Cheng Paul Wen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:26
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03B9/14; H03B9/141
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
172 words
A frequency tuned microwave oscillator comprising: a waveguide section having a moveable short-circuiting piston at one end; first and second electrically coupled radial cavity resonators within said waveguide section, each of said resonators being formed by a circular disc mounted on one wall of said waveguide section and the opposite wall of said waveguide section, said disc having a tapered surface facing said opposite wall and defining thereby the cavity of said resonator; said second cavity resonator being positioned in said waveguide section between said first cavity resonator and said moveable short circuiting piston and separated from said first cavity resonator by a distance which is substantially equal to an integral number of half-wavelengths of the generated microwave signal; said moveable short-circuiting piston being adjusted to be separated from said second cavity resonator by a distance which is substantially equal to an integral number of halfwavelengths of the generated microwave signal; a microwave generating element disposed within said first cavity resonator; and a variable reactance element disposed within said second cavity resonator.
Claim 2
Dependent Claim
172 words
A frequency tuned microwave oscillator comprising: a waveguide section having a moveable short-circuiting piston at one end; first and second electrically coupled radial cavity resonators within said waveguide section, each of said resonators being formed by a circular disc mounted on one wall of said waveguide section and the opposite wall of said waveguide section, said disc having a tapered surface facing said opposite wall and defining thereby the cavity of said resonator; said second cavity resonator being positioned in said waveguide section between said first cavity resonator and said moveable short circuiting piston and separated from said first cavity resonator by a distance which is substantially equal to an integral number of half-wavelengths of the generated microwave signal; said moveable short-circuiting piston being adjusted to be separated from said second cavity resonator by a distance which is substantially equal to an integral number of halfwavelengths of the generated microwave signal; a microwave generating element disposed within said first cavity resonator; and a variable reactance element disposed within said second cavity resonator.
Claim 3
Dependent Claim
33 words
A microwave apparatus in accordance with claim 1 in which the microwave generating element comprises a semiconductor diode operating in an impatt mode, said diode having an anode electrode and a cathode electrode.
Claim 4
Dependent Claim
38 words
A microwave apparatus in accordance with claim 2 having means for applying a bias signal, exceeding a predetermined threshold value, across the electrodes of said diode, to effect said diode being triggered into said impatt mode of operation.
Claim 5
Dependent Claim
46 words
A microwave apparatus in accordance with claim 1 in which the variable reactance element comprises a varactor diode, said diode having an anode electrode and a cathode electrode, and having a junction capacitance which varies as a function of a bias voltage applied across said electrodes.
Claim 6
Dependent Claim
31 words
A microwave apparatus in accordance with claim 4 having means for applying a variable DC bias voltage across the electrodes of said varactor diode to effect said variance in junction capacitance.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |