US3879689A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched phase shifter
Assignee: AT&T Inc
•
Filing: 1974-06-21
•
Granted: 1975-04-22
•
Expires: 1994-06-21
Abstract
Abstract An impedance matched phase shifter is realized by the use of dual reactances. In one embodiment one of the reactances is connected in parallel with the series-aiding connected windings of 1:1 turns ratio transformer. The second reactance is connected between the common junction of the two transformer windings and ground. In a second embodiment, a phase shifter employing a three-winding transformer is disclosed for coupling between circuits having different impedance levels.
Inventors
- 👤 Harold Seidel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:38
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/18
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
145 words
A phase shifter having a phase shift phi 2 arctan X/2Zo over a prescribed frequency band of interest comprising: a tightly coupled two-winding transformer having a 1:1 turns ratio; one end of one transformer winding being connected to one end of the other transformer winding to form a series-aiding connection; a first reactive network having a reactance X being connected between the other ends of said series-connected transformer windings thereby forming at one connection a first common junction and at the other connection a second common junction; and a second reactive network, having a susceptance B such that X/Zo BZo, being connected between said one ends of said transformer windings and a third common junction; said first and said third common junctions constituting a first port of said phase shifter; said second and said third common junctions constituting a second port of said phase shifter.
Claim 2
Dependent Claim
145 words
A phase shifter having a phase shift phi 2 arctan X/2Zo over a prescribed frequency band of interest comprising: a tightly coupled two-winding transformer having a 1:1 turns ratio; one end of one transformer winding being connected to one end of the other transformer winding to form a series-aiding connection; a first reactive network having a reactance X being connected between the other ends of said series-connected transformer windings thereby forming at one connection a first common junction and at the other connection a second common junction; and a second reactive network, having a susceptance B such that X/Zo BZo, being connected between said one ends of said transformer windings and a third common junction; said first and said third common junctions constituting a first port of said phase shifter; said second and said third common junctions constituting a second port of said phase shifter.
Claim 3
Dependent Claim
145 words
A phase shifter having a phase shift phi 2 arctan X/2Zo over a prescribed frequency band of interest comprising: a tightly coupled two-winding transformer having a 1:1 turns ratio; one end of one transformer winding being connected to one end of the other transformer winding to form a series-aiding connection; a first reactive network having a reactance X being connected between the other ends of said series-connected transformer windings thereby forming at one connection a first common junction and at the other connection a second common junction; and a second reactive network, having a susceptance B such that X/Zo BZo, being connected between said one ends of said transformer windings and a third common junction; said first and said third common junctions constituting a first port of said phase shifter; said second and said third common junctions constituting a second port of said phase shifter.
Claim 4
Dependent Claim
145 words
A phase shifter having a phase shift phi 2 arctan X/2Zo over a prescribed frequency band of interest comprising: a tightly coupled two-winding transformer having a 1:1 turns ratio; one end of one transformer winding being connected to one end of the other transformer winding to form a series-aiding connection; a first reactive network having a reactance X being connected between the other ends of said series-connected transformer windings thereby forming at one connection a first common junction and at the other connection a second common junction; and a second reactive network, having a susceptance B such that X/Zo BZo, being connected between said one ends of said transformer windings and a third common junction; said first and said third common junctions constituting a first port of said phase shifter; said second and said third common junctions constituting a second port of said phase shifter.
Claim 5
Dependent Claim
38 words
The phase shifter according to claim 1 where said first reactive network includes an inductance connected across said series-connected windings; and wherein said inductance is provided at least in part by the core inductance of said transformer windings.
References Cited (Backward Citations)
US3514722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-21 | 1978-10-21 | 1979-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-21 | 1982-10-21 | 1983-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-21 | 1986-10-21 | 1987-04-22 | $7700.00 | Window Closed / Lapsed |