Patent US3609598A successfully refreshed from Google Patents.
US3609598A
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Periodically loaded ferrite phase shifter
Assignee: United States Department of the Army
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Filing: 1970-03-19
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Granted: 1971-09-28
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Expires: 1990-03-19
Abstract
Abstract An improvement over the existing art in microwave phase shifters of the nonreciprocal class. This invention employs a toroid of ferromagnetic material which can be magnetized in at least two of its remanent states. Higher interaction with microwave energy is obtained when a periodic disturbance is introduced into the transmission line which slows the propagating wave and provides a higher degree of circular polarization in the active region of the toroid. Periodic perturbation of the electromagnetic field is accomplished by spacing partitions across the waveguide which are loaded with ferrite toroids. The dimensional spacing of the partitions is on the order of a fraction of a free-space wavelength.
Inventors
- 👤 William G Spaulding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:52
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19; H01P1/195
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
A periodically loaded ferrite phase shifter comprising: a plurality of laminae coaxially aligned and having symmetrical openings therethrough forming a waveguide section, a plurality of ferrite toroids positioned in respective laminae openings along the longitudinal axis of said waveguide section, a plurality of thin metallic disks periodically positioned along the longitudinal axis of said waveguide section and coaxially aligned with said toroids for providing a capacitive susceptance in said waveguide section, and means for magnetizing said toroids into at least two states of remanent magnetization.
Claim 2
Dependent Claim
85 words
A periodically loaded ferrite phase shifter comprising: a plurality of laminae coaxially aligned and having symmetrical openings therethrough forming a waveguide section, a plurality of ferrite toroids positioned in respective laminae openings along the longitudinal axis of said waveguide section, a plurality of thin metallic disks periodically positioned along the longitudinal axis of said waveguide section and coaxially aligned with said toroids for providing a capacitive susceptance in said waveguide section, and means for magnetizing said toroids into at least two states of remanent magnetization.
Claim 3
Dependent Claim
73 words
A periodically loaded ferrite phase shifter as set forth in claim 1 and further comprising a plurality of thin metal sheets partially obstructing said symmetrical laminae openings and having symmetrically spaced apertures therethrough, said apertures being periodically positioned along the longitudinal axis of said waveguide and coaxially aligned with said toroids for providing an inductive susceptance in said waveguide section, and wherein said disks and said apertures are positioned alternately between said toroids.
Claim 4
Dependent Claim
33 words
A periodically loaded ferrite phase shifter as set forth in claim 2 wherein said apertures have a diameter greater than and said disks have a diameter less than the diameter of said toroids.
Claim 5
Dependent Claim
92 words
A periodically loaded ferrite phase shifter comprising: a plurality of coaxially aligned laminations having symmetrical, aligned openings therethrough forming a waveguide section, a ferrite toroid positioned in each of said lamination openings in coaxial alignment, a plurality of thin metal sheets, each having an aperture therein, periodically inserted between said laminations, said sheets partially obstructing said laminate openings and said apertures being coaxially aligned with said ferrite toroids for introducing an inductive susceptance in said waveguide section, and means for magnetizing said ferrite toroids into at least two states of remanent magnetization.
Claim 6
Dependent Claim
92 words
A periodically loaded ferrite phase shifter comprising: a plurality of coaxially aligned laminations having symmetrical, aligned openings therethrough forming a waveguide section, a ferrite toroid positioned in each of said lamination openings in coaxial alignment, a plurality of thin metal sheets, each having an aperture therein, periodically inserted between said laminations, said sheets partially obstructing said laminate openings and said apertures being coaxially aligned with said ferrite toroids for introducing an inductive susceptance in said waveguide section, and means for magnetizing said ferrite toroids into at least two states of remanent magnetization.
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) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |