US3648199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-independent yig filter
Assignee: Westinghouse Electric Corp
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Filing: 1970-06-01
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Granted: 1972-03-07
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Expires: 1990-06-01
Abstract
Abstract A cancellation effect is obtained between the temperaturedependent phenomenon of the externally applied magnetic field and the crystallographic orientation of a gyromagnetic element by utilizing a temperature compensating magnetic shunt in combination with a permanent magnet used to establish a unidirectional or DC magnetic field through the gyromagnetic element comprising a YIG sphere and selectively orienting its axis to a predetermined angle defined by the direction of the DC magnetic field wherein the resonance frequency of the YIG sphere increases with temperature. Thus, any decrease in saturation magnetization as a function of temperature is exactly cancelled out by selective orientation of the YIG sphere.
Inventors
- 👤 Daniel C Buck
- 👤 James M Schellenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:06
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/215; H01P1/218
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
211 words
An electromagnetic wave device employing magnetized gyromagnetic material for selectively coupling electromagnetic energy between input and output electromagnetic wave conducting means, comprising in combination: a specimen of a single cubic crystal of gyromagnetic material that exhibits gyromagnetic resonance, the frequency of which is a function of temperature variations, including means for being selectively located between said input and output electromagnetic wave conducting means; unidirectional magnetic field means having a characteristic whose magnetization value changes in a first direction with respect to a change in temperature and magnetic shunt coupled to said unidirectional magnetic field means, said magnetic shunt having a change in magnetization value in a second direction for said change in temperature, said magnetic field means and said shunt being substantially aligned with said specimen to provide a substantially temperature compensated unidirectional magnetic field through said specimen for magnetically polarizing said specimen in a given direction to exhibit a predetermined resonance frequency; and said specimen being crystallographically oriented relative to said magnetic field wherein the value of the resonance frequency of said specimen changes in said second direction for said change in temperature, said orientAtion additionally being such that any further variation in said first direction of said magnet means is cancelled out by the crystallographic orientation of said specimen.
Claim 2
Dependent Claim
211 words
An electromagnetic wave device employing magnetized gyromagnetic material for selectively coupling electromagnetic energy between input and output electromagnetic wave conducting means, comprising in combination: a specimen of a single cubic crystal of gyromagnetic material that exhibits gyromagnetic resonance, the frequency of which is a function of temperature variations, including means for being selectively located between said input and output electromagnetic wave conducting means; unidirectional magnetic field means having a characteristic whose magnetization value changes in a first direction with respect to a change in temperature and magnetic shunt coupled to said unidirectional magnetic field means, said magnetic shunt having a change in magnetization value in a second direction for said change in temperature, said magnetic field means and said shunt being substantially aligned with said specimen to provide a substantially temperature compensated unidirectional magnetic field through said specimen for magnetically polarizing said specimen in a given direction to exhibit a predetermined resonance frequency; and said specimen being crystallographically oriented relative to said magnetic field wherein the value of the resonance frequency of said specimen changes in said second direction for said change in temperature, said orientAtion additionally being such that any further variation in said first direction of said magnet means is cancelled out by the crystallographic orientation of said specimen.
Claim 3
Dependent Claim
18 words
The combination as defined in claim 1 wherein said specimen of gyromagnetic material is a spherically shaped element.
Claim 4
Dependent Claim
32 words
The invention as defined by claim 1 wherein said specimen is comprised of gyromagnetic material selected from the group consisting of yttrium iron garnet, gallium substituted yttrium iron garnet and lithium ferrite.
Claim 5
Dependent Claim
28 words
The invention as defined by claim 1 wherein said specimen comprises a YIG sphere having its (111) axis oriented at a predetermined angle relative to said magnetic field.
Claim 6
Dependent Claim
20 words
The invention as defined in claim 4 wherein said magnetic shunt comprises a sleeve externally mounted on magnetic field means.
Claim 7
Dependent Claim
22 words
The invention as defined in claim 4 wherein said magnetic shunt comprises a shunt member located internally of said magnetic field means.
Claim 8
Dependent Claim
34 words
The invention as defined by claim 1 wherein said magnetic field means comprises a permanent magnet comprised of platinum and cobalt and wherein said magnetic shunt comprises a substantially 30 percent nickel-iron shunt member.
Claim 9
Dependent Claim
33 words
The invention as defined by claim 1 and additionally including means coupled to said specimen for selectively orienting the (111) axis of said specimen relative to said substantially temperature compensated unidirectional magnetic field.
Claim 10
Dependent Claim
18 words
The invention as defined by claim 8 wherein said means coupled to said specimen comprises a dielectric rod.
Claim 11
Dependent Claim
82 words
The invention as defined by claim 1 wherein said input and output electromagnetic wave conducting means comprises a first and a second substantially mutually perpendicular strip of conductor material formed on a first and a second dielectric member and wherein said specimen is located in an iris contained in a metallic ground plane located between said first and said second dielectric member, and said magnetic field is orthogonally aligned relative to said first and second strip of conductor material through said specimen.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |