US3731237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broadband transformers
Assignee: AT&T Inc
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Filing: 1972-02-03
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Granted: 1973-05-01
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Expires: 1992-02-03
Abstract
Abstract A high return loss is maintained over the passband of a broadband transformer by reducing parasitic interwinding capacitance. This is accomplished by locating the windings along physically separated regions of a common magnetic core. To compensate for any loss of magnetic coupling at the higher frequencies due to a decrease in core permeability, equal portions of the physically separated windings are connected in parallel.
Inventors
- 👤 H Beurrier
- 👤 C Township
- 👤 M County
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:34
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/04; H01F19/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
77 words
A broadband transformer comprising: a plurality of windings, including primary and secondary windings, wound on a common magnetic core; characterized in that: said primary and secondary windings are physically separated from each other to minimize parasitic interwinding capacitance; said core has a decreasing permeability at the higher end of the frequency band of interest; and in that at least a portion of a primary winding is connected in parallel with an equal portion of a secondary winding.
Claim 2
Dependent Claim
77 words
A broadband transformer comprising: a plurality of windings, including primary and secondary windings, wound on a common magnetic core; characterized in that: said primary and secondary windings are physically separated from each other to minimize parasitic interwinding capacitance; said core has a decreasing permeability at the higher end of the frequency band of interest; and in that at least a portion of a primary winding is connected in parallel with an equal portion of a secondary winding.
Claim 3
Dependent Claim
16 words
The transformer in accordance with claim 1 wherein said winding portions are conductively connected in parallel.
Claim 4
Dependent Claim
36 words
The transformer in accordance with claim 1 wherein there are two windings; and wherein said winding portions are connected in parallel by means of a capacitor at one end and a conductor at the other end.
Claim 5
Dependent Claim
22 words
The transformer in accordance with claim 1 wherein said winding portions are connected in parallel by means of a pair of capacitors.
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) | 1976-04-30 | 1976-10-30 | 1977-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-30 | 1980-10-30 | 1981-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-30 | 1984-10-30 | 1985-05-01 | $7700.00 | Window Closed / Lapsed |