Patent US7864014B2 successfully refreshed from Google Patents.
US7864014B2
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Mode-switching transformer
Assignee: STMicroelectronics SA
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Filing: 2003-10-30
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Granted: 2011-01-04
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Expires: 2023-10-30
Abstract
Abstract A mode-switching transformer comprising a first line in common mode and a second line in differential mode, each line comprising two sections in series respectively coupled with one of the two sections of the other line and all sections having the same lengths, the common mode line being connected in series with a capacitor, to lower the central frequency of the transformer passband, the λ/4 lengths of the sections being chosen to correspond to a central frequency greater than the central frequency desired for the transformer.
Inventors
- 👤 Hilal Ezzeddine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:10
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/42; H01; H01P; H01P5/00; H01P5/08; H01P5/10; H01F; H01F19/00; H01F19/04; H03H7/01; H03H7/17; H03H7/1741; H03H7/175
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
170 words
A mode-switching transformer comprising a first line in common mode and a second line in differential mode, each line comprising two sections in series respectively coupled with one of the two sections of the other line and all sections having the same lengths, wherein the common mode line is connected in series with a capacitor, to lower a central frequency of a bandwidth of the transformer, the λ/4 lengths of the sections being chosen to correspond to a central frequency greater than a desired central frequency for the transformer; wherein the value of capacitor C respects the following relation: C = 1 2 π f 0 Z c tg ( β L ) , where f 0 designates the desired central frequency, where L designates the length of the two sections in series calculated in λ/2 from said central frequency greater than the desired central frequency, where Z c designates the characteristic line impedance, and where β designates the phase constant.
Claim 2
Dependent Claim
170 words
A mode-switching transformer comprising a first line in common mode and a second line in differential mode, each line comprising two sections in series respectively coupled with one of the two sections of the other line and all sections having the same lengths, wherein the common mode line is connected in series with a capacitor, to lower a central frequency of a bandwidth of the transformer, the λ/4 lengths of the sections being chosen to correspond to a central frequency greater than a desired central frequency for the transformer; wherein the value of capacitor C respects the following relation: C = 1 2 π f 0 Z c tg ( β L ) , where f 0 designates the desired central frequency, where L designates the length of the two sections in series calculated in λ/2 from said central frequency greater than the desired central frequency, where Z c designates the characteristic line impedance, and where β designates the phase constant.
Claim 3
Dependent Claim
46 words
A mode-switching transformer, comprising: a common mode winding; a differential mode winding electromagnetically coupled with the common mode winding defining a central frequency; and only one capacitor electrically coupled to the common-mode winding, wherein the value of the capacitor is inversely proportional to the central frequency.
Claim 4
Dependent Claim
46 words
A mode-switching transformer, comprising: a common mode winding; a differential mode winding electromagnetically coupled with the common mode winding defining a central frequency; and only one capacitor electrically coupled to the common-mode winding, wherein the value of the capacitor is inversely proportional to the central frequency.
Claim 5
Dependent Claim
26 words
The mode-switching transformer of claim 2 wherein the differential mode windings comprise a length and the value of the capacitor is inversely proportional to the length.
Claim 6
Dependent Claim
26 words
The mode-switching transformer of claim 2 wherein the differential mode windings comprise an impedance and the value of the capacitor is inversely proportional to the impedance.
Claim 7
Dependent Claim
28 words
The mode-switching transformer of claim 2 wherein the differential mode windings comprise a phase constant and the value of the capacitor is inversely proportional to the phase constant.
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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) | 2014-01-03 | 2014-07-05 | 2015-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2018-01-03 | 2018-07-05 | 2019-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2022-01-03 | 2022-07-05 | 2023-01-04 | $7700.00 | Window Closed / Lapsed |