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US5352990A
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Power matching network comprising an intermediate transmission line between a transistor amplifier output end and at least one open-end line
Assignee: NEC Corp
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Filing: 1994-01-06
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Granted: 1994-10-04
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Expires: 2014-01-06
Abstract
Abstract In a power matching network which is used between a load and a transistor amplifier producing at its output end an amplified signal comprising a fundamental frequency signal and odd and even harmonic signals and comprises a matching circuit between the load and a line end, an open-end transmission line is connected to the output end and has a predetermined length shorter than a quarter wavelength of the fundamental frequency signal. An intermediate transmission line is connected between the output and the line ends and has a length of a quarter wavelength less the predetermined length. At least one open-end transmission line is connected to the line end and has a length of a quarter wavelength of the odd harmonic signal which is preferably composed of (2n+1)-th harmonic signals, where n represents integers starting at 1 and ending at a predetermined integer of at least 2. More preferably, the line end is connected to an additional transmission line which is either a 1/8 wavelength of the fundamental frequency signal long and has an end shorted for high frequency signals or is a 1/16 wavelength of the fundamental frequency signal long.
Inventors
- 👤 Norio Goto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:10
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/60; H03F1/00; H03F1/56; H03F3/20; H03F3/21; H03F3/217; H03F3/2176
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A power matching network for a transistor amplifier producing at its output end an amplified signal comprising a fundamental frequency signal and odd and even harmonic signals, said power matching network comprising: an open-end transmission line connected to said output end and having a length of a 1/8 wavelength of said fundamental frequency signal; an intermediate transmission line connected to said output end and having a line end and a length of said 1/8 wavelength; at least one open-end transmission line connected to said line end and having a quarter wavelength of said odd harmonic signal; and a matching circuit connected to said line end for said fundamental frequency signal.
Claim 2
Dependent Claim
110 words
A power matching network for a transistor amplifier producing at its output end an amplified signal comprising a fundamental frequency signal and odd and even harmonic signals, said power matching network comprising: an open-end transmission line connected to said output end and having a length of a 1/8 wavelength of said fundamental frequency signal; an intermediate transmission line connected to said output end and having a line end and a length of said 1/8 wavelength; at least one open-end transmission line connected to said line end and having a quarter wavelength of said odd harmonic signal; and a matching circuit connected to said line end for said fundamental frequency signal.
Claim 3
Dependent Claim
41 words
A power matching network as claimed in claim 1, further comprising an additional transmission line connected to said output end and having a length of a quarter wavelength of said fundamental frequency signal and an end shorted for high frequency signals.
Claim 4
Dependent Claim
36 words
A power matching network as claimed in claim 1, further comprising an additional transmission line connected to said line end and having a length of said 1/8 wavelength and an end shorted for high frequency signals.
Claim 5
Dependent Claim
32 words
A power matching network as claimed in claim 1, further comprising an open-end transmission line connected to said line end and a length of a 1/16 wavelength of said fundamental frequency signal.
Claim 6
Dependent Claim
54 words
A power matching network as claimed in claim 1, wherein said at least one open-end transmission line consists of a plurality of open-end transmission lines having lengths of quarter wavelengths of (2n+1)-th harmonic signals, where n represents integers starting at 1 and ending at a predetermined integer which is equal at least to 2.
Claim 7
Dependent Claim
140 words
A power matching network for a transistor amplifier producing at its output end an amplified signal comprising a fundamental frequency signal and odd and even harmonic signals, said power matching network comprising: an open-end transmission line connected to said output end and having a predetermined length which is shorter than a quarter wavelength of said fundamental frequency signal and is not equal to a 1/8 wavelength of said fundamental frequency signal; an intermediate transmission line connected to said output end and having a line end and a length which is equal to said quarter wavelength less said predetermined length; at least one open-end transmission line connected to said line end and having a length of a quarter wavelength of said odd harmonic signal; and (claim 6 continued) a matching circuit connected to said line end for said fundamental frequency signal.
Claim 8
Dependent Claim
54 words
A power matching network as claimed in claim 6, wherein said at least one open-end transmission line consists of a plurality of open-end transmission lines having lengths of quarter wavelengths of (2n+1)-th harmonic signals, where n represents integer starting at 1 and ending at a predetermined integer which is equal at least to 2.
Claim 9
Dependent Claim
41 words
A power matching network as claimed in claim 7, further comprising an additional transmission line connected to said output end and having a length of a quarter wavelength of said fundamental frequency signal and an end shorted for higher frequency signals.
Claim 10
Dependent Claim
41 words
A power matching network as claimed in claim 7, further comprising an additional transmission line connected to said line end and having a length of a 1/8 wavelength of said fundamental frequency signal and an end shorted for high frequency signals.
Claim 11
Dependent Claim
33 words
A power matching network as claimed in claim 7, further comprising an open-end transmission line connected to said line end and having a length of a 1/16 wavelength of said fundamental frequency signal.
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) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |