US3882432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
RF broadband transmission line impedance matching transformer pair for less than 4 to 1 impedance transformations
Assignee: United States Department of the Army
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Filing: 1974-06-28
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Granted: 1975-05-06
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Expires: 1994-06-28
Abstract
Abstract An impedance transforming device is disclosed which includes four conductors coil-wound and connected to form a transmission line having two coils connected in series in each side and a circuit network connecting the two sides of the transmission line to achieve a desired transformation ratio.
Inventors
- 👤 Dennis W Bowman
- 👤 Robert E Horn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:19
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
187 words
A broad band impedance matching transformer including a first conductor coil-wound on a first core and having first and second terminals, a second conductor coil-wound on a second core and having third and fourth terminals, said second and third terminals being connected electrically in common, to form the first side of a transmission line, a third conductor coil wound on said first core and having fifth and sixth terminals, said first and third conductors being twisted together, a fourth conductor coil wound on said second core and having seventh and eighth terminals, said seventh and sixth terminals being connected electrically in common to form the second side of a transmission line, said second and fourth conductors being twisted together, and a network interconnecting said first and second sides of said transmission line characterized in that a load impedance is connected in parallel with said third coil-wound conductor, and said network includes first circuit element means for interconnecting said second and sixth terminals, second circuit element means for interconnecting said third and eighth terminals and third circuit element means connecting said fourth and fifth terminals electrically in common.
Claim 2
Dependent Claim
187 words
A broad band impedance matching transformer including a first conductor coil-wound on a first core and having first and second terminals, a second conductor coil-wound on a second core and having third and fourth terminals, said second and third terminals being connected electrically in common, to form the first side of a transmission line, a third conductor coil wound on said first core and having fifth and sixth terminals, said first and third conductors being twisted together, a fourth conductor coil wound on said second core and having seventh and eighth terminals, said seventh and sixth terminals being connected electrically in common to form the second side of a transmission line, said second and fourth conductors being twisted together, and a network interconnecting said first and second sides of said transmission line characterized in that a load impedance is connected in parallel with said third coil-wound conductor, and said network includes first circuit element means for interconnecting said second and sixth terminals, second circuit element means for interconnecting said third and eighth terminals and third circuit element means connecting said fourth and fifth terminals electrically in common.
Claim 3
Dependent Claim
42 words
A broad band impedance matching device in accordance with claim 1 wherein said first circuit element means is an open circuit across said second and sixth terminals, and said second circuit element means connects said third and eighth terminals electrically in common.
Claim 4
Dependent Claim
45 words
A broad band impedance matching device in accordance with claim 1 wherein said first circuit element means comprises a first coil connected across said second and sixth terminals and said second circuit element means comprises a second coil connected across said third and eighth terminals.
Claim 5
Dependent Claim
29 words
A broad band impedance matching device in accordance with claim 3 wherein said first and second coils are the two sides of a transformer wound as a transmission line.
Claim 6
Dependent Claim
96 words
A broad band impedance matching device in accordance with claim 1 wherein said second circuit element means comprises one side of a first transformer connected across said third and eighth terminals, said first circuit element means comprises the other side of said first transformer connected across said second and sixth terminals in series with the first side of a second transformer and the other side of said second transformer being connected across said second and sixth terminals in parallel with said serially connected other side of said first transformer and first side of said second transformer.
Claim 7
Dependent Claim
22 words
A broad band impedance matching device in accordance with claim 5 wherein said first and second transformers are wound as transmission lines.
Claim 8
Dependent Claim
103 words
A broad band impedance matching device having four conductors coil-wound and serially connected in pairs to form input and output coils in either side of a transmission line and one side of said transmission line being grounded between input and output coils characterized in that a load impedance is connected across said input coil in the grounded side of said transmission line and a network is connected across the two sides of said transmission line, said network having means to produce a ratio of input and output impedance in said device following the series (n+1/n)2 where n is an integer greater than unity.
Claim 9
Dependent Claim
103 words
A broad band impedance matching device having four conductors coil-wound and serially connected in pairs to form input and output coils in either side of a transmission line and one side of said transmission line being grounded between input and output coils characterized in that a load impedance is connected across said input coil in the grounded side of said transmission line and a network is connected across the two sides of said transmission line, said network having means to produce a ratio of input and output impedance in said device following the series (n+1/n)2 where n is an integer greater than unity.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |