US3713049A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for deflecting magnetic waves utilizing a ferrimagnetic plate
Assignee: Thales SA
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Filing: 1971-06-01
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Granted: 1973-01-23
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Expires: 1991-06-01
Abstract
Abstract The present invention relates to a device for deflecting magnetic waves. According to the invention, there is provided a system comprising a plate of ferrimagnetic material polarized by a magnetic field H, wherein magnetic waves are excited. An arrangement constituted by a serpentine wire conductor lying on an insulating plate, periodically modulates the magnetic polarizing field in a zone underlying said arrangement, the latter induces a diffraction grating disposed in such a way that the magnetic waves arrive on it at the BRAGG angle. A controllable current source 6 supplies the wire conductor.
Inventors
- 👤 B Desormiere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:42
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
216 words
A system for switching under the control of an electrical signal the direction of propagation of magnetic waves, said system comprising a plate of spin wave ferrimagnetic material having an upper face, inductor means for creating within said plate a magnetic field substantially parallel to said upper face, means for exciting within said plate a beam of magnetic waves travelling along a direction substantially perpendicular to said magnetic field, scattering means positioned above said upper face for receiving said beam ; said scattering means splitting the energy of said beam under the control of said electrical signal into a transmitted portion and a scattered portion ; first collecting means coupled to said plate for receiving the transmitted portion of said beam, and second collecting means coupled to said plate for receiving the scattered portion of said beam ; said scattering means comprising a planar conducting loop parallel to said upper face, and including a plurality of parallel and equidistant rectilinear portions building up a diffraction grating, and a source for energizing said loop under the control of said electrical signal ; said diffraction grating being at an angle with said beam substantially equal to arc sin Mu /2d ; where Mu is the wavelength of said magnetic waves, and d the pitch of said diffraction grating.
Claim 2
Independent Claim
216 words
A system for switching under the control of an electrical signal the direction of propagation of magnetic waves, said system comprising a plate of spin wave ferrimagnetic material having an upper face, inductor means for creating within said plate a magnetic field substantially parallel to said upper face, means for exciting within said plate a beam of magnetic waves travelling along a direction substantially perpendicular to said magnetic field, scattering means positioned above said upper face for receiving said beam ; said scattering means splitting the energy of said beam under the control of said electrical signal into a transmitted portion and a scattered portion ; first collecting means coupled to said plate for receiving the transmitted portion of said beam, and second collecting means coupled to said plate for receiving the scattered portion of said beam ; said scattering means comprising a planar conducting loop parallel to said upper face, and including a plurality of parallel and equidistant rectilinear portions building up a diffraction grating, and a source for energizing said loop under the control of said electrical signal ; said diffraction grating being at an angle with said beam substantially equal to arc sin Mu /2d ; where Mu is the wavelength of said magnetic waves, and d the pitch of said diffraction grating.
Claim 3
Dependent Claim
21 words
System as claimed in claim 1, wherein said conducting loop is deposited on an insulating layer carried on Said upper face.
Claim 4
Dependent Claim
22 words
System as claimed in claim 1, wherein said source is a current source having a control input for receiving said electrical signal.
Claim 5
Dependent Claim
32 words
System as claimed in claim 1, wherein said means for exciting comprises an interdigitated line deposited on said upper face and a microwave connector for feeding said line with microwave electro/magnetic energy.
Claim 6
Dependent Claim
43 words
System as claimed in claim 1, wherein said magnetic field is a uniform magnetic field ; each of said collecting means comprising an interdigitated line deposited on said upper face and a microwave connector receiving the microwave electro/magnetic energy supplied from said line.
Claim 7
Dependent Claim
67 words
System as claimed in claim 1, wherein said magnetic field has a magnitude substantially constant between said means for exciting and said scattering means and a decreasing magnitude beyond said scattering means ; each of said collecting means being an ultrasonic waveguide coupled to the remote edge of a region of said plate where said magnetic waves are substantially converted into pure elastic waves of ultrasonic frequency.
References Cited (Backward Citations)
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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) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |