US3602845A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slot line nonreciprocal phase shifter
Assignee: United States Department of the Army
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Filing: 1970-01-27
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Granted: 1971-08-31
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Expires: 1990-01-27
Abstract
Abstract A nonreciprocal microwave energy phase shifter utilizing a slot line for propagating microwave energy and a ferrite member which is magnetically biased to produce a magnetic field therein which is orthogonal to and interacts with the RF magnetic field cyclically generated along the slot line. The ferrite may be in the form of a toroid to provide a closed-loop magnetic field and which is produced by a latching current.
Inventors
- 👤 John P Agrios
- 👤 Nathan Lipetz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:30
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P1/195
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
48 words
A nonreciprocal microwave energy phase shifter comprising a ferrite substrate, a slot line on one surface of said substrate for propagating RF microwave energy, and means for producing in said ferrite substrate a magnetic bias field orthogonally oriented to the RF magnetic field of said propagated microwave energy.
Claim 2
Dependent Claim
48 words
A nonreciprocal microwave energy phase shifter comprising a ferrite substrate, a slot line on one surface of said substrate for propagating RF microwave energy, and means for producing in said ferrite substrate a magnetic bias field orthogonally oriented to the RF magnetic field of said propagated microwave energy.
Claim 3
Dependent Claim
39 words
The phase shifter in accordance with claim 1 wherein said slot line comprises a pair of longitudinally spaced metal strips separated by a very narrow slot, and wherein said RF magnetic field is elliptically polarized along said narrow slot.
Claim 4
Dependent Claim
24 words
The phase shifter in accordance with claim 2 wherein said ferrite substrate is in the form of a toroid having a substantial longitudinal dimension.
Claim 5
Dependent Claim
24 words
The phase shifter in accordance with claim 3 wherein said slot is along a line parallel to the longitudinal axis of said ferrite toroid.
Claim 6
Dependent Claim
22 words
The phase shifter in accordance with claim 3 wherein the magnetization of said ferrite toroid is characterized by a square hysteresis loop.
Claim 7
Dependent Claim
22 words
The phase shifter in accordance with claim 4 wherein the magnetization of said ferrite toroid is characterized by a square hysteresis loop.
Claim 8
Dependent Claim
41 words
The phase shifter in accordance with claim 3 wherein said slot line is on one outer surface of said ferrite toroid and said magnetic-field bias-producing means is in circuit with a portion of said ferrite toroid not including said slot line.
Claim 9
Dependent Claim
41 words
The phase shifter in accordance with claim 4 wherein said slot line is on one inner surface of said ferrite toroid and said magnetic-field bias-producing means is in circuit with a portion of said ferrite toroid not including said slot line.
Claim 10
Dependent Claim
52 words
A nonreciprocal microwave energy phase shifter comprising a substrate, a slot line on one surface of said substrate for propagating RF microwave energy, a ferrite toroid positioned over said slot line, and means for producing a closed magnetic-field loop in said toroid, said magnetic field being characterized by a square hysteresis loop.
Claim 11
Dependent Claim
52 words
A nonreciprocal microwave energy phase shifter comprising a substrate, a slot line on one surface of said substrate for propagating RF microwave energy, a ferrite toroid positioned over said slot line, and means for producing a closed magnetic-field loop in said toroid, said magnetic field being characterized by a square hysteresis loop.
Claim 12
Dependent Claim
14 words
The phase shifter in accordance with claim 9 wherein said substrate is a dielectric.
Claim 13
Dependent Claim
23 words
The phase shifter in accordance with claim 10 and further including a latching current-carrying conductor extending through the aperture of said ferrite toroid.
Claim 14
Dependent Claim
17 words
The phase shifter in accordance with claim 11 wherein said ferrite toroid is above said slot line.
Claim 15
Dependent Claim
20 words
The phase shifter in accordance with claim 10 wherein said ferrite toroid surrounDs said slot line and said dielectric substrate.
Claim 16
Dependent Claim
27 words
The phase shifter in accordance with claim 13 and further including a central aperture in said dielectric substrate and a latching current conductor extending through said aperture.
Claim 17
Dependent Claim
27 words
The phase shifter in accordance with claim 12 wherein the slot of said slot line is along a line parallel to the axis of said ferrite toroid.
Claim 18
Dependent Claim
16 words
The phase shifter in accordance with claim 9 wherein said substrate is a second ferrite toroid.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-30 | 1975-03-01 | 1975-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-30 | 1979-03-01 | 1979-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-30 | 1983-03-01 | 1983-08-31 | $7700.00 | Window Closed / Lapsed |