Patent US3784933A successfully refreshed from Google Patents.
US3784933A
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Broadband balun
Assignee: Textron Inc
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Filing: 1971-05-03
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Granted: 1974-01-08
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Expires: 1991-05-03
Abstract
Abstract A balun comprised as electrical leads forming a slot line and having a tapered configuration to provide a matching impedance to an asymmetrical conducting system such as coaxial cable, stripline, microstrip, etc. Broadband impedance matching is achieved between symmetrical and asymmetrical electrical transmission systems.
Inventors
- 👤 J Scherer
- 👤 J Koerner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:52
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/08; H01P5/10; H01P5/1007
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
103 words
A broadband balun comprising, a dielectric substrate, a conductive layer on a single side of said substrate separated by a slot into first and second conductors, said conductors each being tapered from a maximum width at the base end to a small width at an opposite end, a coaxial cable disposed transversely across the base end of said first conductor with the cable sheath electrically contacting the first conductor and the central cable conductor extending across said slot into electrical contact with said second conductor, and a second coaxial cable sheath mounted across the base of said second conductor in electrical contact therewith.
Claim 2
Dependent Claim
103 words
A broadband balun comprising, a dielectric substrate, a conductive layer on a single side of said substrate separated by a slot into first and second conductors, said conductors each being tapered from a maximum width at the base end to a small width at an opposite end, a coaxial cable disposed transversely across the base end of said first conductor with the cable sheath electrically contacting the first conductor and the central cable conductor extending across said slot into electrical contact with said second conductor, and a second coaxial cable sheath mounted across the base of said second conductor in electrical contact therewith.
Claim 3
Dependent Claim
83 words
The balun of claim 1 further defined by the thickness of said substrate, the width of said slot and the width of said first and second conductors at the base thereof being dimensioned to establish an impedance substantially equal to the characteristic impedance of said coaxial cable, and the conductor width decreasing away from the base to a dimension establishing an impedance substantially equal to the impedance of a load to be connected across the conductors at the ends away from the base.
Claim 4
Dependent Claim
32 words
The balun of claim 1 further defined by said first and second conductors extending from said substrate at the opposite end of the conductors from said base as a two wire line.
Claim 5
Dependent Claim
124 words
A broadband balun comprising, a solid dielectric substrate, a conductive layer upon a first surface of said substrate and separated by a slot into first and second conductors, said conductors having maximum widths at a base end thereof with such widths being sufficient to establish said conductors as a slot line conductor and said conductors tapering inwardly toward the slot away from the base end to an opposite end whereby the impedance increases from the base end to the opposite end, and a coaxial cable having a sheath abOut a central conductor, said sheath extending across the base of said first conductor in electrical contact therewith, and said central conductor extending from said sheath across said slot into electrical contact with said second conductor.
Claim 6
Dependent Claim
124 words
A broadband balun comprising, a solid dielectric substrate, a conductive layer upon a first surface of said substrate and separated by a slot into first and second conductors, said conductors having maximum widths at a base end thereof with such widths being sufficient to establish said conductors as a slot line conductor and said conductors tapering inwardly toward the slot away from the base end to an opposite end whereby the impedance increases from the base end to the opposite end, and a coaxial cable having a sheath abOut a central conductor, said sheath extending across the base of said first conductor in electrical contact therewith, and said central conductor extending from said sheath across said slot into electrical contact with said second conductor.
Claim 7
Dependent Claim
26 words
The balun of claim 4 further defined by a second coaxial cable sheath only extending across the base of said second conductor in electrical contact therewith.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |