US3906387A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amplifier for high-frequency signals
Assignee: US Philips Corp
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Filing: 1974-03-04
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Granted: 1975-09-16
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Expires: 1994-03-04
Abstract
Abstract An amplifier for high-frequency signals which comprises a transistor. The input circuit comprises two conductors which form a transmission line and which are connected on the other end to the base and the emitter of the transistor. One of these conductors is electrically shielded from the ground conductor by the other conductor, and this other conductor forms a transmission line having a length lambda /4 in conjunction with the ground conductor. This other conductor is connected on the side of the input to the ground conductor via a coupling member which blocks direct current. Various embodiments are described with thin metal layers and coaxial cables. The input signals can be applied to the said one conductor and the ground conductor.
Inventors
- 👤 Hubert Martel
- 👤 Pierre Paris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:31
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
180 words
An amplifier for high-frequency signals, comprising: a conductive ground plate; first and second conductors parallel to each other and parallel to said ground plate forming a first transmission line between said ground plate and said first conductor and forming a second transmission line between said first conductor and said second conductor, said first conductor shielding said second conductor from said ground plate; a transistor mounted on said ground plate adjacent one end of said first and second conductors, said transistor having a collector in thermal and electrical contact with said ground plate and having an emitter and base one of which is electrically connected to said first conductor and the other of which is electrically connected to said second conductor; a coupling member, which blocks direct current but has low impedance to the high-frequency eLectrical signals to be amplified, connecting said first conductor to said ground plate at a distance from said one end of said first conductor such that said coupling member presents a high impedance to the high-frequency electrical signals at said one end of said first conductor.
Claim 2
Dependent Claim
180 words
An amplifier for high-frequency signals, comprising: a conductive ground plate; first and second conductors parallel to each other and parallel to said ground plate forming a first transmission line between said ground plate and said first conductor and forming a second transmission line between said first conductor and said second conductor, said first conductor shielding said second conductor from said ground plate; a transistor mounted on said ground plate adjacent one end of said first and second conductors, said transistor having a collector in thermal and electrical contact with said ground plate and having an emitter and base one of which is electrically connected to said first conductor and the other of which is electrically connected to said second conductor; a coupling member, which blocks direct current but has low impedance to the high-frequency eLectrical signals to be amplified, connecting said first conductor to said ground plate at a distance from said one end of said first conductor such that said coupling member presents a high impedance to the high-frequency electrical signals at said one end of said first conductor.
Claim 3
Dependent Claim
29 words
An amplifier as defined in claim 1 wherein said first and second conductors are metal layers mutually spaced from each other and from said ground plate by insulating layers.
Claim 4
Dependent Claim
28 words
An amplifier as defined in claim 1 wherein said first conductor is the outerconductor of a coaxial two-conductor system and said second conductor is the inner conductor thereof.
Claim 5
Dependent Claim
44 words
An amplifier as defined in claim 3 wherein said second conductor is the central conductor of a coaxial three-conductor system, said first conductor is the central conductor of said system and the outer conductor of said system is electrically connected with said ground plate.
Claim 6
Dependent Claim
57 words
An amplifier as defined in claim 1 wherein said first conductor comprises a metal layer spaced from said ground plate by an insulating layer and two parallel spaced conductors in longitudinal contact with said metal layer, said second conductor comprising a conductor enveloped by an insulating jacket and positioned parallel to and between said parallel spaced conductors.
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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |