Patent US3872252A successfully refreshed from Google Patents.
US3678418A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Printed circuit balun
Assignee: RCA Corp
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Filing: 1971-07-28
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Granted: 1972-07-18
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Expires: 1991-07-28
Abstract
Abstract A printed circuit balun includes a first relatively broad conductor on a first surface of a dielectric substrate which conductor first-mentioned from an unbalanced end of the balun to a point near the opposite balanced end of the balun. On the opposite or second surface of the substrate, there is provided a second conductor that has a first relatively narrow conductor portion spaced directly opposite the first-mentioned broad conductor. The second conductor also has on the second surface a second relatively broad conductor portion parallel to the narrow portion of the second conductor. The second relatively broad conductor portion of the second conductor is coupled at a point near the unbalanced end of the balun through the substrate to the first-mentiondd broad conductor on the first surface of the substrate. The narrow conductor portion of the second conductor is joined to the broad conductor portion of the second conductor near the balanced end of the balun.
Inventors
- 👤 Oakley Mcdonald Woodward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:11
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/0213; H05K1/0237; H05K1/0239; H01; H01P; H01P5/00; H01P5/08; H01P5/10; H05K1/16; H05K1/162; H05K2201/00; H05K2201/09; H05K2201/09209; H05K2201/09654; H05K2201/09672; H05K2201/09727
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
215 words
An improved printed circuit balun for providing a balanced to unbalanced line transition over a desired operating range of frequencies comprising in combination: a dielectric substrate having two essentially parallel spaced sides, a first conductor on a first side of said substrate and extending from the balanced to unbalanced end of said balun, said first conductor including a relatively broad member, a second conductor on the second opposite side of the substrate, said second conductor having first, second and third members, said first member of said second conductor being relatively narrow and spaced parallel to and on that portion of said second opposite side of said substrate directly opposite said first conductor to form with said first conductor an unbalanced transmission line, said second member of said second conductor being relatively broad and extending generally parallel to and spaced from said first member of said second conductor so as to be out of the electromagnetic coupling region of said unbalanced transmission line, said third member of said second conductor being relatively narrow and coupled at the balanced end of the balun between the first member and the second member of said second conductor, said second conductor being directly connected to the first conductor near the open end of the second member of said second conductor.
Claim 2
Dependent Claim
215 words
An improved printed circuit balun for providing a balanced to unbalanced line transition over a desired operating range of frequencies comprising in combination: a dielectric substrate having two essentially parallel spaced sides, a first conductor on a first side of said substrate and extending from the balanced to unbalanced end of said balun, said first conductor including a relatively broad member, a second conductor on the second opposite side of the substrate, said second conductor having first, second and third members, said first member of said second conductor being relatively narrow and spaced parallel to and on that portion of said second opposite side of said substrate directly opposite said first conductor to form with said first conductor an unbalanced transmission line, said second member of said second conductor being relatively broad and extending generally parallel to and spaced from said first member of said second conductor so as to be out of the electromagnetic coupling region of said unbalanced transmission line, said third member of said second conductor being relatively narrow and coupled at the balanced end of the balun between the first member and the second member of said second conductor, said second conductor being directly connected to the first conductor near the open end of the second member of said second conductor.
Claim 3
Dependent Claim
30 words
The combination as claimed in claim 1 wherein the relatively broad members have a width on the order of at least three times the width of the relatively narrow members.
Claim 4
Dependent Claim
32 words
The combination as claimed in claim 2 wherein the length of said second member of said second conductor is on the order of one-quarter wavelength at an operating frequency of said balun.
Claim 5
Dependent Claim
209 words
The combination as claimed in claim 3 wherein said first conductor includes a second and third member, the second member being relatively narrow and extending at one end to the balanced end of said balun and to the third member being coupled between the other end of said first member of said first conductor near the balanced end and the second member, the third member of said in claim 4 wherein said second conductor includes fourth and fifth members located near the balanced end of said balun and on said second opposite surface of said substrate with said fourth member being relatively narrow and being directly opposite said second member of said first conductor to form a balanced transmission line, said fifth member being coupled between the junction of said second and third members of said second conductor and said fourth member of said second conductor with the width of said fifth member being tapered between the relatively broad width of the second member of said second conductor nd the relatively narrow width of said fourth member of said second conductor. first conductor having a width tapering from the relatively broad width of the first member to the relatively narrow width of the second member of said second conductor.
Claim 6
Dependent Claim
118 words
The combination as claimed in claim 4 wherein said second conductor includes fourth and fifth members located near the balanced end of said balun and on said second opposite surface of said substrate with said fourth member being relatively narrow and being directly opposite said second member of said first conductor to form a balanced transmission line, said fifth member being coupled between the junction of said second and third members of said second conductor and said fourth member of said second conductor with the width of said fifth member being tapered between the relatively broad width of the second member of said second conductor and the relatively narrow width of said fourth member of said second conductor.
Claim 7
Dependent Claim
58 words
The combination as claimed in claim 5 wherein said first conductor includes a fourth relatively broad conductive member at said unbalanced end of said balun and said second conductor includes a relativeLy narrow sixth member spaced directly opposite said fourth member of said first conductor and being of relatively narrow width to form an unbalanced strip transmission line.
References Cited (Backward Citations)
US2581156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |