US5363060A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave amplifier
Assignee: Mitsubishi Electric Corp
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Filing: 1993-08-09
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Granted: 1994-11-08
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Expires: 2013-08-09
Abstract
Abstract A microwave amplifier includes an amplifier, an impedance matching circuit for matching input and output impedances of the amplifier, and an open stub. The impedance matching circuit includes input and output side distributed constant lines each having a length equivalent to a 1/4 wavelength of a signal having the highest frequency in a desired frequency band. The open stub is disposed in the vicinity of the input or output side distributed constant line. The length of the open stub is varied to vary a narrow frequency band in which the maximum gain of the amplifier is attained. In this structure, the return loss is reduced and a uniform tuning in the frequency band is easily carried out using the open stub. In addition, the maximum potential of the amplifier is achieved in the desired frequency band.
Inventors
- 👤 Masaki Kohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:24
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F3/601
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for match input and output impedances of said amplifier, said impedance match circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; and a package containing said amplifier and said impedance matching circuit, said open stub comprising a plurality of electrically conducting islands connected to each other by narrow electrically conducting patterns and connected to respective power supply pads disposed outside said package, said narrow patterns connecting the islands being selectively severable with an electrical current selectively applied to said power supply pads to produce a desired length of said open stub.
Claim 2
Dependent Claim
162 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for match input and output impedances of said amplifier, said impedance match circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; and a package containing said amplifier and said impedance matching circuit, said open stub comprising a plurality of electrically conducting islands connected to each other by narrow electrically conducting patterns and connected to respective power supply pads disposed outside said package, said narrow patterns connecting the islands being selectively severable with an electrical current selectively applied to said power supply pads to produce a desired length of said open stub.
Claim 3
Dependent Claim
151 words
A microwave amplifier comprising: an amplifier; an impedance matching circuit for matching put and output impedances of said amplifier, said impedance match circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; a package containing said amplifier and said impedance match circuit, said open stub comprising a plurality of electrically conducting islands with respective, different lengths spaced apart from each other; and a switch for selecting one of the islands and connecting the selected island to one of said distributed constant lines, thereby providing a desired length of said open stub.
Claim 4
Dependent Claim
151 words
A microwave amplifier comprising: an amplifier; an impedance matching circuit for matching put and output impedances of said amplifier, said impedance match circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; a package containing said amplifier and said impedance match circuit, said open stub comprising a plurality of electrically conducting islands with respective, different lengths spaced apart from each other; and a switch for selecting one of the islands and connecting the selected island to one of said distributed constant lines, thereby providing a desired length of said open stub.
Claim 5
Dependent Claim
135 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for matching input and output impedances of said amplifier, said impedance matching circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; a package containing said amplifier and said impedance match circuit, said open stub comprising a plurality of electrically conducting islands spaced apart from each other; and conductive switches for selectively connecting adjacent islands together, thereby providing a desired length of said open stub.
Claim 6
Dependent Claim
135 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for matching input and output impedances of said amplifier, said impedance matching circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; a package containing said amplifier and said impedance match circuit, said open stub comprising a plurality of electrically conducting islands spaced apart from each other; and conductive switches for selectively connecting adjacent islands together, thereby providing a desired length of said open stub.
Claim 7
Dependent Claim
163 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for matching input and output impedances of said amplifier, said impedance matching circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; and a package including a lid and containing said amplifier and said impedance match circuit, said open stub comprising an insulating projection disposed on said lid inside said package, a metal sheet of a prescribed size disposed on said projection opposite said lid, said metal sheet contacting one of said distributed constant lines, thereby providing a desired length of said open stub according to the prescribed size of said metal sheet.
Claim 8
Dependent Claim
163 words
A microwave amplifier comprising: an amplifier; an impedance match circuit for matching input and output impedances of said amplifier, said impedance matching circuit comprising input and output side distributed constant lines, each line having a length equivalent to 1/4 wavelength of a signal having the highest frequency in a desired frequency band; an open stub connected to at least one of said input and output side distributed constant lines, the length of said open stub being variable for varying a narrow frequency band in which maximum gain of said amplifier is attained; and a package including a lid and containing said amplifier and said impedance match circuit, said open stub comprising an insulating projection disposed on said lid inside said package, a metal sheet of a prescribed size disposed on said projection opposite said lid, said metal sheet contacting one of said distributed constant lines, thereby providing a desired length of said open stub according to the prescribed size of said metal sheet.
Claim 9
Dependent Claim
14 words
The microwave amplifier of claim 1 wherein said amplifier is a field effect transistor.
Claim 10
Dependent Claim
14 words
The microwave amplifier of claim 2 wherein said amplifier is a field effect transistor.
Claim 11
Dependent Claim
14 words
The microwave amplifier of claim 3 wherein said amplifier is a field effect transistor.
Claim 12
Dependent Claim
14 words
The microwave amplifier of claim 4 wherein said amplifier is a field effect transistor.
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US5065117A
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JPH0366211A
Cited
JPH0457502A
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JPH0468706A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-11-07 | 1998-05-09 | 1998-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-07 | 2002-05-09 | 2002-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-07 | 2006-05-09 | 2006-11-08 | $7700.00 | Window Closed / Lapsed |