Patent US4801901A successfully refreshed from Google Patents.
US4801901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-ferrite non-reciprocal phase shifter and circulator
Assignee: Hittite Microwave LLC
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Filing: 1987-03-13
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Granted: 1989-01-31
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Expires: 2007-03-13
Abstract
Abstract A non-reciprocal phase shifter including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction and an amplifier circuit connected between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; and a circulator made from such a phase shifter.
Inventors
- 👤 Yalcin Ayasli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:14
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/18; H03H7/185; H01; H01P; H01P1/00; H01P1/18; H01P1/32; H01P1/38; H01P1/397; H03H7/52
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
90 words
A non-reciprocal bi-directional phase shifter comprising: a monolithic, non-ferrite circuit including: a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same is each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals, said amplifier circuit operating to introduce its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift between said first and second terminals.
Claim 2
Dependent Claim
90 words
A non-reciprocal bi-directional phase shifter comprising: a monolithic, non-ferrite circuit including: a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same is each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals, said amplifier circuit operating to introduce its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift between said first and second terminals.
Claim 3
Dependent Claim
27 words
The phase shifter of claim 1 in which said amplifier circuit includes an amplifier and coupling means for interconnecting said amplifier with said first and second terminals.
Claim 4
Dependent Claim
13 words
The phase shifter of claim 2 in which said coupling means are capacitors.
Claim 5
Dependent Claim
30 words
The phase shifter of claim 2 in which said amplifier is a transistor with one electrode grounded and the other two electrodes connected respectively to said first and second terminals.
Claim 6
Dependent Claim
39 words
The phase shifter of claim 1 in which said amplifier circuit comprises three ports, one connected to said first terminal, one connected to said second terminal and one connected to a third terminal intermediate said first and second terminals.
Claim 7
Dependent Claim
29 words
The phase shifter of claim 1 in which said transmission medium introduces approximately a 90° phase shift and said amplifier circuit introduces an inherent phase shift of approximately 180°.
Claim 8
Dependent Claim
17 words
The phase shifter of claim 1 further including impedance matching circuits interconnected with each of said terminals.
Claim 9
Dependent Claim
102 words
A three-port circulator comprising: three bi-directional phase shifters each including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; said phase shifters being interconnected in a ring with the first terminal of each shifter being interconnected with the second terminal of another.
Claim 10
Dependent Claim
102 words
A three-port circulator comprising: three bi-directional phase shifters each including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; said phase shifters being interconnected in a ring with the first terminal of each shifter being interconnected with the second terminal of another.
Claim 11
Dependent Claim
34 words
The three-port circulator of claim 8 in which the first terminal of each of said phase shifters is interconnected with the second terminal of another phase shifter through at least one impedance matching element.
Claim 12
Dependent Claim
99 words
A four-port circulator comprising: at least one non-reciprocal bi-directional phase shifter including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; a second bi-directional phase shifter; and a passive four-port coupling network interconnecting said first and second phase shifters.
Claim 13
Dependent Claim
99 words
A four-port circulator comprising: at least one non-reciprocal bi-directional phase shifter including a transmission medium connected between first and second terminals and having a predetermined phase shift which is the same in each direction; and an amplifier circuit connected in parallel with the transmission medium between the first and second terminals for introducing its inherent phase shift in one direction and a phase shift in excess of its inherent phase shift in the other direction for establishing a non-reciprocal phase shift; a second bi-directional phase shifter; and a passive four-port coupling network interconnecting said first and second phase shifters.
Claim 14
Dependent Claim
15 words
The four-port circulator of claim 10 in which said second bi-directional phase shifter is non-reciprocal.
Claim 15
Dependent Claim
15 words
The four-port circulator of claim 10 in which said second bi-directional phase shifter is reciprocal.
Claim 16
Dependent Claim
19 words
The four-port circulator of claim 10 in which said passive four-port coupling network includes at least one "magic-T" coupler.
Claim 17
Dependent Claim
19 words
The four-port circulator of claim 10 in which said passive four-port coupling network includes at least one directional coupler.
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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) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-01-31 | 2000-08-01 | 2001-01-31 | $7700.00 | Window Closed / Lapsed |