Patent US4724399A successfully refreshed from Google Patents.
US4724399A
Expired / Lapsed
US
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Circuit arrangement comprising an isolator integral with an admittance element
Assignee: NEC Corp
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Filing: 1986-02-20
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Granted: 1988-02-09
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Expires: 2006-02-20
Abstract
Abstract In a circuit arrangement comprising a three port isolator (21) which has input, output, and dummy ports (33, 22, and 23), an admittance element (41 to 43) is connected at a position or positions selected between the input and the output ports, between the output and the dummy ports, and between the dummy and the input ports. When the isolator comprises a strip line conductor having branches connected to the input, the output, and the dummy ports, the admittance element may be an extension or extensions of the branches. The output port is connected to an amplifier (14) directly or through an inductance element (34). The connection of the admittance element makes it unnecessary to connect a matching circuit which is otherwise essential between the isolator and the amplifier.
Inventors
- 👤 Wakoto Akinaga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:00
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/38; H01P1/383; H01P1/387; H03; H03F; H03F3/00; H03F3/60; H03F3/608
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
152 words
An amplification circuit for use in satellite communication and comprising an isolator having an input port for an input signal, an output port for an output signal, and a dummy port connected to a dummy load, an amplifier having an admittance for amplifying said output signal, a conductive housing for accommodating said isolator and said amplifier, and an inductance element between said amplifier and said output port, said isolator comprising an admittance element which is operable to adjust the admittance of said isolator to that of said amplifier in cooperation with said inductance element and which is connected to said isolator at a position elected between said input and said output ports, between said output and said dummy ports, and between said dummy and said input ports whereby said output port is connected directly to said amplifier through said inductance element without any matching circuit for matching said isolator and said amplifier.
Claim 2
Dependent Claim
152 words
An amplification circuit for use in satellite communication and comprising an isolator having an input port for an input signal, an output port for an output signal, and a dummy port connected to a dummy load, an amplifier having an admittance for amplifying said output signal, a conductive housing for accommodating said isolator and said amplifier, and an inductance element between said amplifier and said output port, said isolator comprising an admittance element which is operable to adjust the admittance of said isolator to that of said amplifier in cooperation with said inductance element and which is connected to said isolator at a position elected between said input and said output ports, between said output and said dummy ports, and between said dummy and said input ports whereby said output port is connected directly to said amplifier through said inductance element without any matching circuit for matching said isolator and said amplifier.
Claim 3
Dependent Claim
18 words
An amplification circuit as claimed in claim 1, wherein said output port is connected direct to said amplifier.
Claim 4
Dependent Claim
21 words
An amplification circuit as claimed in claim 1, wherein said output port is connected through a reactance element to said amplifier.
Claim 5
Dependent Claim
24 words
An amplification circuit as claimed in claim 1, wherein said input, said output, and said dummy ports are coplanar together with said admittance element.
Claim 6
Dependent Claim
40 words
An amplification circuit as claimed in claim 4, said isolator comprising a strip line conductor which comprises three coplanar branches connected to said input, said output, and said dummy ports, respectively, wherein said admittance element is integral with said branches.
Claim 7
Dependent Claim
18 words
An amplification circuit as claimed in claim 5, wherein said admittance element comprises extensions of the respective branches.
Claim 8
Dependent Claim
28 words
An amplification circuit as claimed in claim 6, wherein said extensions and said input, said output, and said dummy ports are azimuthally equally spaced apart from one another.
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) | 1991-02-08 | 1991-08-10 | 1992-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-08 | 1995-08-10 | 1996-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-08 | 1999-08-10 | 2000-02-09 | $7700.00 | Window Closed / Lapsed |