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US6040745A
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Unbalanced-to-balanced converter
Assignee: Murata Manufacturing Co Ltd
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Filing: 1997-11-25
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Granted: 2000-03-21
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Expires: 2017-11-25
Abstract
Abstract An unbalanced-to-balanced converter (balun) comprising three distributed-constant lines. In one distributed-constant line, a standing wave is generated. Disposed adjacent thereto is another distributed-constant line to which the power of the standing wave is transferred. A signal input to the unbalanced-to-balanced converter is divided into two signals having phases 180 degrees apart and the same level.
Inventors
- 👤 Hiroaki Tanaka
- 👤 Yutaka Sasaki
- 👤 Takuya Hashimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:33
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
189 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed-constant lines are disposed so that in response to an input signal received at said input terminal, a pair of output signals appear at said first and second output terminals having phases substantially 180° apart and having substantially the same level, and wherein said first, second and third distributed-constant lines are at least 10 μm apart.
Claim 2
Dependent Claim
189 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed-constant lines are disposed so that in response to an input signal received at said input terminal, a pair of output signals appear at said first and second output terminals having phases substantially 180° apart and having substantially the same level, and wherein said first, second and third distributed-constant lines are at least 10 μm apart.
Claim 3
Dependent Claim
21 words
A converter as in claim 1, wherein each of said output signals has substantially half the power of said input signal.
Claim 4
Dependent Claim
161 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed-constant lines are disposed substantially parallel with each other on a dielectric substrate, and wherein said first, second and third distributed-constant lines are at least 10 μm apart.
Claim 5
Dependent Claim
161 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed-constant lines are disposed substantially parallel with each other on a dielectric substrate, and wherein said first, second and third distributed-constant lines are at least 10 μm apart.
Claim 6
Dependent Claim
19 words
A converter as in claim 3, wherein said first, second and third distributed-constant lines are constituted by respective microstriplines.
Claim 7
Dependent Claim
19 words
A converter as in claim 3, wherein said first, second and third distributed-constant lines are constituted by respective striplines.
Claim 8
Dependent Claim
142 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed constant lines are at least 10 μm apart.
Claim 9
Dependent Claim
142 words
An unbalanced-to-balanced converter for use at a given wavelength, comprising: first, second, and third distributed-constant lines disposed in this order and arranged for being electromagnetically coupled with each other; said first, second, and third distributed-constant lines having coupling sections whose length is substantially one fourth of said given wavelength; and a first end of said first distributed-constant line is an input terminal, said first end of said first distributed-constant line is connected to a first end of said second distributed-constant line, a second end of said second distributed-constant line and a first end of said third distributed-constant line are grounded, a second end of said first distributed-constant line is a first output terminal, and a second end of said third distributed-constant line is a second output terminal, wherein said first, second and third distributed constant lines are at least 10 μm apart.
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) | 2003-03-21 | 2003-09-20 | 2004-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-03-21 | 2007-09-20 | 2008-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-03-21 | 2011-09-20 | 2012-03-21 | $7700.00 | Window Closed / Lapsed |