US3753163A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic wave-elastic wave transducer and method
Assignee: CHU ASS INC US
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Filing: 1971-12-27
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Granted: 1973-08-14
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Expires: 1991-12-27
Abstract
Abstract This disclosure is concerned with converting electromagneticwaves to elastic waves (and vice-versa) in successive regions near an end of a magneto-elastic medium wherein electromagnetic energy tunneling is first forced, spin-wave conversion is then achieved, and finally spin wave-elastic wave conversion is effected such that the elastic waves are propagated in the medium (and vice-versa).
Inventors
- 👤 F Morgenthaler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:00
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/125
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
201 words
A method of transducing electromagnetic waves into elastic waves and vice versa, that comprises, producing a magnetic field profile along a magneto-elastic-wave supporting medium that steeply decreases at one end and increases at the other end; contacting electromagnetic wave antennae to the said ends of the medium; applying a bias magnetic field to the medium and adjusting the value and orientation thereof to cause its magnetic field operating-level line to intersect the steeply decreasing and increasing portions of the magnetic field profile at intermediate points of such portions such that, as the electromagnetic wave launches into the medium at said one end, it initially encounters in a first region preceding the said intermediate point, both electromagnetic-wave-cutoff and spin wave-conversion-suppression, forcing tunneling through said first region to the next adjacent region at which conversion to spin waves of successively decreasing wavelength occurs, which, in turn, are propagated to a further adjacent region of said steeply decreasing profile portion at which the wavelength has become sufficiently small to effect conversion from spin-wave to elastic-wave energy; and propagating the elastic wave energy into the medium; with the reverse conversion operation occuring at the said other end in the steeply rising magnetic field profile portion.
Claim 2
Independent Claim
201 words
A method of transducing electromagnetic waves into elastic waves and vice versa, that comprises, producing a magnetic field profile along a magneto-elastic-wave supporting medium that steeply decreases at one end and increases at the other end; contacting electromagnetic wave antennae to the said ends of the medium; applying a bias magnetic field to the medium and adjusting the value and orientation thereof to cause its magnetic field operating-level line to intersect the steeply decreasing and increasing portions of the magnetic field profile at intermediate points of such portions such that, as the electromagnetic wave launches into the medium at said one end, it initially encounters in a first region preceding the said intermediate point, both electromagnetic-wave-cutoff and spin wave-conversion-suppression, forcing tunneling through said first region to the next adjacent region at which conversion to spin waves of successively decreasing wavelength occurs, which, in turn, are propagated to a further adjacent region of said steeply decreasing profile portion at which the wavelength has become sufficiently small to effect conversion from spin-wave to elastic-wave energy; and propagating the elastic wave energy into the medium; with the reverse conversion operation occuring at the said other end in the steeply rising magnetic field profile portion.
Claim 3
Independent Claim
144 words
A method of transducing between electromagnetic waves and elastic waves, that comprises, producing a steeply changing magnetic field profile at an end of a magneto-elastic-wave supporting medium; contacting an electro-magnetic wave antenna to said end of the medium; applying a bias magnetic field to the medium of such direction and valve that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point thereof defining a first region thereof, where electromagnetic wave energy is cutoff and spin-wave conversion thereof is suppressed to force tunneling through said first region, with conversion to spin waves of successively changing wavelength occuring along the next adjacent region of the steeply changing profile up to the point where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the elastic wave energy being supported in the medium adjacent the said end.
Claim 4
Independent Claim
144 words
A method of transducing between electromagnetic waves and elastic waves, that comprises, producing a steeply changing magnetic field profile at an end of a magneto-elastic-wave supporting medium; contacting an electro-magnetic wave antenna to said end of the medium; applying a bias magnetic field to the medium of such direction and valve that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point thereof defining a first region thereof, where electromagnetic wave energy is cutoff and spin-wave conversion thereof is suppressed to force tunneling through said first region, with conversion to spin waves of successively changing wavelength occuring along the next adjacent region of the steeply changing profile up to the point where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the elastic wave energy being supported in the medium adjacent the said end.
Claim 5
Dependent Claim
26 words
A method as claimed in claim 2 and in which said bias field is varied to tune the operating frequency of the transducer to predtermined values.
Claim 6
Dependent Claim
164 words
An electromagnetic wave-elastic wave transducer having, in combination, a magneto-elastic-wave supporting medium provided at one end with an electromagnetic wave antenna, means for establishing at said one end a magnetic field profile that steeply changes over a narrow portion of the medium near said one end, means for applying a bias magnetic field to thE medium of such direction and value that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point defining a first region thereof followed by second and third adjacent regions of the steeply changing profile, the field being adjusted to produce spin electromagnetic-wave cutoff and spin wave conversion suppression along the said first region to force tunneling therealong, with conversion to spin waves of successively changing wavelength along the said second region and with the third region disposed where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the medium adjacent said one end supporting the elastic wave energy therein.
Claim 7
Dependent Claim
164 words
An electromagnetic wave-elastic wave transducer having, in combination, a magneto-elastic-wave supporting medium provided at one end with an electromagnetic wave antenna, means for establishing at said one end a magnetic field profile that steeply changes over a narrow portion of the medium near said one end, means for applying a bias magnetic field to thE medium of such direction and value that its magnetic field operating-level line intersects the steeply changing profile at an intermediate point defining a first region thereof followed by second and third adjacent regions of the steeply changing profile, the field being adjusted to produce spin electromagnetic-wave cutoff and spin wave conversion suppression along the said first region to force tunneling therealong, with conversion to spin waves of successively changing wavelength along the said second region and with the third region disposed where such wavelength is sufficiently small to effect conversion between spin wave and elastic wave energy; the medium adjacent said one end supporting the elastic wave energy therein.
Claim 8
Dependent Claim
42 words
An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which a second transducer combination as claimed in claim 4 is applied at the other end of the medium to effect reverse conversion between electromagnetic and elastic wave energy thereat.
Claim 9
Dependent Claim
41 words
An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which the said first, second and third regions near said one end thereof comprise successive sections of successively different saturation magnetization to effect such steeply changing magnetic profile characteristics.
Claim 10
Dependent Claim
44 words
An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which said medium comprises YIG material, and the said first, second and third regions near said one end thereof comprise successively varying saturation magnetization epitaxial YIG layers grown upon said one end.
Claim 11
Dependent Claim
30 words
An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which means is provided for controlling the bias magnetic field to tune the transducer to predetermined operating frequencies.
Claim 12
Dependent Claim
37 words
An electromagnetic wave-elastic wave transducer as claimed in claim 4 and in which the means provided to produce said steeply changing magnetic profile comprises a further medium disposed adjacent the first-named medium but of different saturation magnetization.
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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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |