US4034312A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave oscillator using a transit time transistor
Assignee: Thales SA
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Filing: 1976-03-26
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Granted: 1977-07-05
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Expires: 1996-03-26
Abstract
Abstract A microwave oscillator using a transit-time transistor structure with a space charge zone, is provided. The negative resistance introduced by the transit-time in the space charge zone is utilized in a circuit connected with emitter and collector, the base being direct-biased and not passing the high frequency. To avoid a short-circuiting by the parasitic base-collector capacitance, a transmission line is connected in parallel across the base and collector terminals. The input impedance of this line is adjusted by short-circuiting this line at a distance close to a quarter of wavelength, thus creating an input inductance able to compensate the effect of the base-collector capacitance.
Inventors
- 👤 Marc Armand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:57
CPC Classifications
H; H03; H03B; H03B9/00; H03B9/12; H03F; H03F3/00; H03F3/60; H03F3/608; H10; H10W; H10W44/00; H10W44/20; H10W44/203; H10W44/209; H10W44/212; H10W44/226; H10W70/00; H10W70/60; H10W70/67; H10W70/68; H10W70/682; H10W70/685; H10W72/00; H10W72/071; H10W72/075; H10W72/07531; H10W72/07532; H10W72/50; H10W72/531; H10W72/536; H10W72/541; H10W72/547; H10W72/5473; H10W90/00; H10W90/701; H10W90/751; H10W90/753; H10W90/754
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
88 words
A device utilizing transit time effects, comprising: a semiconductor structure of the transistor type with emitter, base and collector terminals, able to generate a high frequency oscillation at a predetermined frequency, by applying of a direct current voltage across emitter and collector terminals; a transmission line of adjustable length having its input across said base and collector terminals and its output short-circuited at high frequency said adjustable length being able to vary on both sides of a value equal to a quarter of wavelength at said predetermined frequency.
Claim 2
Independent Claim
88 words
A device utilizing transit time effects, comprising: a semiconductor structure of the transistor type with emitter, base and collector terminals, able to generate a high frequency oscillation at a predetermined frequency, by applying of a direct current voltage across emitter and collector terminals; a transmission line of adjustable length having its input across said base and collector terminals and its output short-circuited at high frequency said adjustable length being able to vary on both sides of a value equal to a quarter of wavelength at said predetermined frequency.
Claim 3
Dependent Claim
32 words
A device as claimed in claim 1, wherein said output is constituted by a coaxial line element comprising a metal conductive piston sliding in the gap between its axis and its periphery.
Claim 4
Dependent Claim
64 words
A device as claimed in claim 2, wherein said semiconductor structure is located at the end of a coaxial line section whose peripheral conductor is connected to the peripheral conductor of said coaxial line element, and whose central conductor is interrupted to enable, the emitter-base space of said structure to be inserted there, the collector of said structure being connected with said peripheral conductors.
Claim 5
Dependent Claim
21 words
A device as claimed in claim 3, wherein the axis of said section is perpendicular to the axis of said element.
Claim 6
Dependent Claim
38 words
A device as claimed in claim 2, wherein said input comprises a section of "microstrip" line whose earth and line conductors are respectively connected to the peripheral conductor and to the central conductor of the coaxial line element.
Claim 7
Dependent Claim
24 words
A device as claimed in claim 5, wherein said microstrip line section is extended at the emitter end by an additional microstrip line section.
Claim 8
Dependent Claim
21 words
A device as claimed in claim 6, wherein said additional microstrip line section is connected to an additional coaxial line section.
Claim 9
Dependent Claim
27 words
A device as claimed in claim 2, wherein said structure is located in a waveguide into which said coaxial line element opens and a disc matching device.
Claim 10
Dependent Claim
33 words
A device as claimed in claim 2, wherein said structure is located in a chamber formed in the wall of a waveguide in order to match said waveguide to said coaxial line element.
Claim 11
Dependent Claim
42 words
A device as claimed in claim 9, wherein the emitter contact of said structure is connected to a piston sliding in said chamber and operable by means of a rod passing through a cylinder opening into the wall opposite to said chamber.
References Cited (Backward Citations)
US3699475A
Cited
US3946336A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |