US4288759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave transformer
Assignee: The AT&T MVPD Group LLC
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Filing: 1980-01-28
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Granted: 1981-09-08
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Expires: 2000-01-28
Abstract
Abstract Transformer configurations especially useful in the microwave frequency range. A reliable physical center-tap is achieved by the interposition of a stub at the center of an elongated member which provides electrical contact with a reactive impedance. The circuit formed thereby allows the reflection of an r.f. short circuit to the center of the elongated portion without attendant fabrication thereon. A loop configuration for the remaining coupling means allows adjustability of electromagnetic coupling which is less sensitive to spacing of primary and secondary than the common parallel configuration.
Inventors
- 👤 Harry L. Stover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:50
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/12
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
91 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means comprising a loop overlying and inductively engaged to said first coupling means; and (c) means for providing a reactive impedance conductively engaged to said stub member at a distance of a multiple of one-quarter λ from the first end of said stub member.
Claim 2
Dependent Claim
91 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means comprising a loop overlying and inductively engaged to said first coupling means; and (c) means for providing a reactive impedance conductively engaged to said stub member at a distance of a multiple of one-quarter λ from the first end of said stub member.
Claim 3
Dependent Claim
41 words
A transformer as defined in claim 1 further characterized in that said means for providing a reactive impedance includes means for isolating direct current from alternating current energy so that a d.c. bias may be provided to said first coupling means.
Claim 4
Dependent Claim
55 words
A transformer as defined in claim 2 further characterized in that said means for providing a reactive impedance and said stub member of said first coupling means are so arranged that a short circuit is reflected to the center of said elongated member of said first coupling means with respect to energy of frequency 1/λ.
Claim 5
Dependent Claim
27 words
A transformer as defined in claim 3 further characterized in that said stub member includes a right angle bend a distance one-quarter λ from said first end.
Claim 6
Dependent Claim
49 words
A transformer as defined in claim 4 further characterized in that: (a) said means for providing a reactive impedance includes an inductor and a grounded capacitor; and (b) said inductor and said grounded capacitor are conductively engaged to said stub a distance of one-half λ from said first end.
Claim 7
Dependent Claim
66 words
A transformer as defined in claim 4 further characterized in that: (a) said means for providing a reactive impedance includes an inductor and a grounded capacitor; and (b) said inductor is conductively engaged to said stub member a distance of one-quarter λ from said first end and said grounded capacitor is conductively engaged to said stub member a distance of one-half λ from said first end.
Claim 8
Dependent Claim
24 words
A transformer as defined in claim 1 further characterized in that said first coupling means and said second coupling means are of microstrip fabrication.
Claim 9
Dependent Claim
103 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and (c) means for providing a reactive impedance including an inductor and grounded capacitor conductively engaged to said stub member at a distance of one-half λ from the first end of said stub member so that a direct current bias may be provided to said first coupling means.
Claim 10
Dependent Claim
103 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and (c) means for providing a reactive impedance including an inductor and grounded capacitor conductively engaged to said stub member at a distance of one-half λ from the first end of said stub member so that a direct current bias may be provided to said first coupling means.
Claim 11
Dependent Claim
144 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and p1 (c) means for providing a reactive impedance including an inductor conductively engaged to said stub member at a distance of one-quarter λ from the first end and a grounded capacitor conductively engaged to said stub member at a distance of one-half λ from the first end so that a direct current bias may be provided to said first coupling means and so that an alternating current short circuit for energy of frequency 1/λ is reflected to the center of said elongated member of said first coupling means.
Claim 12
Dependent Claim
144 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and p1 (c) means for providing a reactive impedance including an inductor conductively engaged to said stub member at a distance of one-quarter λ from the first end and a grounded capacitor conductively engaged to said stub member at a distance of one-half λ from the first end so that a direct current bias may be provided to said first coupling means and so that an alternating current short circuit for energy of frequency 1/λ is reflected to the center of said elongated member of said first coupling means.
Claim 13
Dependent Claim
96 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and (c) means for providing a reactive impedance including an inductor conductively engaged to said stub member at a distance of one-quarter λ from said first end so that a direct current bias may be provided to said first coupling means.
Claim 14
Dependent Claim
96 words
A center-tapped transformer for transferring energy having a center frequency 1/λ comprising: (a) first coupling means including an elongated member and a stub member, said stub member having first and second ends, said first end conductively engaged to the center of said elongated member; (b) second coupling means inductively engaged to said first coupling means; and (c) means for providing a reactive impedance including an inductor conductively engaged to said stub member at a distance of one-quarter λ from said first end so that a direct current bias may be provided to said first coupling means.
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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) | 1984-09-07 | 1985-03-09 | 1985-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-09-07 | 1989-03-09 | 1989-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-09-07 | 1993-03-09 | 1993-09-08 | $7700.00 | Window Closed / Lapsed |