US4459567A
Expired / Lapsed
US
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Dielectric waveguide ferrite resonance isolator
Assignee: United States Department of the Army
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Filing: 1982-06-14
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Granted: 1984-07-10
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Expires: 2002-06-14
Abstract
Abstract A dielectric waveguide ferrite resonance isolator capable of operating in the millimeter frequency range in a dielectric waveguide transmission line is provided. The isolator comprises a thin sheet of hexagonal ferrite material that has been affixed to a side of the dielectric waveguide and then placed between the pole pieces of an electromagnet in order to magnetize and fully orient the ferrite material.
Inventors
- 👤 Richard A. Stern
- 👤 Richard W. Babbitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:08
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/32; H01P1/36; H01P1/365
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
125 words
A dielectric waveguide ferrite resonance isolator capable of operating in the millimeter frequency range in a dielectric waveguide transmission line, said isolator comprising: a length of rectangular solid dielectric waveguide having continuous straight sides, input and output ends, and a longitudinal axis; and a thin rectangular substrate of hexagonal grain-oriented ferrite material affixed to a side and extending along a small portion of the length of the dielectric waveguide, said ferrite material having a predetermined magnetic orientation in only one direction transverse to the longitudinal axis, said ferrite material providing low loss transmission of millimeter wave energy propagating along said dielectric waveguide from the input end to the output end and high attenuation of energy propagating oppositely therealong from the output to the input end.
Claim 2
Dependent Claim
125 words
A dielectric waveguide ferrite resonance isolator capable of operating in the millimeter frequency range in a dielectric waveguide transmission line, said isolator comprising: a length of rectangular solid dielectric waveguide having continuous straight sides, input and output ends, and a longitudinal axis; and a thin rectangular substrate of hexagonal grain-oriented ferrite material affixed to a side and extending along a small portion of the length of the dielectric waveguide, said ferrite material having a predetermined magnetic orientation in only one direction transverse to the longitudinal axis, said ferrite material providing low loss transmission of millimeter wave energy propagating along said dielectric waveguide from the input end to the output end and high attenuation of energy propagating oppositely therealong from the output to the input end.
Claim 3
Dependent Claim
41 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the hexagonal ferrite material is selected from the group consisting of barium oxide substituted nickel cobalt ferrite, barium oxide substituted nickel zinc ferrite, and barium oxide substituted nickel aluminum ferrite.
Claim 4
Dependent Claim
22 words
A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel cobalt ferrite.
Claim 5
Dependent Claim
22 words
A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel zinc ferrite.
Claim 6
Dependent Claim
22 words
A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel aluminum ferrite.
Claim 7
Dependent Claim
31 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the height of the rectangular substrate of hexagonal ferrite material is the same as the height of the dielectric waveguide.
Claim 8
Dependent Claim
25 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the thickness of the rectangular substrate of hexagonal ferrite material is about 0.005 inch.
Claim 9
Dependent Claim
29 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the length of the rectangular substrate of hexagonal ferrite material is about 0.050 inch to about 0.300 inch.
Claim 10
Dependent Claim
33 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the rectangular substrate of hexagonal ferrite material is affixed directly to the dielectric waveguide with a low electrical loss epoxy type adhesive.
Claim 11
Dependent Claim
41 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein the dielectric waveguide is composed of a material having a loss tangent at microwave frequencies of less than 4×10 -4 and a dielectric constant from about 9 to about 30.
Claim 12
Dependent Claim
29 words
A dielectric waveguide ferrite resonance isolator according to claim 10 wherein the dielectric waveguide is composed of a material selected from the group consisting of magnesium titanate and alumina.
Claim 13
Dependent Claim
18 words
A dielectric waveguide ferrite resonance isolator according to claim 11 wherein the dielectric waveguide material is magnesium titanate.
Claim 14
Dependent Claim
17 words
A dielectric waveguide ferrite resonance isolator according to claim 11 wherein the dielectric waveguide material is alumina.
Claim 15
Dependent Claim
71 words
A dielectric waveguide ferrite resonance isolator according to claim 1 wherein a second thin rectangular substrate of hexagonal ferrite material identical to the first is placed on the opposite side wall of the dielectric waveguide and has its magnetic orientation in a transverse direction opposite to that of the first hexagonal ferrite material thus enhancing isolation of energy from opposite ends and permitting the length of the ferrite to be shortened.
Claim 16
Dependent Claim
51 words
A dielectric waveguide ferrite resonance isolator according to claim 1 including a series of thin rectangular substrates of hexagonal ferrite material affixed along said side of said dielectric waveguide with longitudinal spacing between each substrate, each of said ferrite substrates functioning over different but contiguous frequency bands providing a broadband isolator.
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) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |