Patent US4458218A successfully refreshed from Google Patents.
US4458218A
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Dielectric waveguide reciprocal ferrite phase shifter
Assignee: United States Department of the Army
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Filing: 1982-06-14
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Granted: 1984-07-03
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Expires: 2002-06-14
Abstract
Abstract A dielectric waveguide reciprocal ferrite phase shifter is provided for usen a dielectric waveguide transmission line. The phase shifter is comprised of a length of ferrite of the same cross-sectional dimension as that of the dielectric waveguide and in fact becomes a section of the transmission line. The length of ferrite bears a thin plastic layer on its top and bottom surface and metal plates on each piece of plastic. The length of this multilayer structure then has a wire coil wrapped around in order to provide a d.c. magnetic biasing field along the length of the ferrite thereby enabling magnetization of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
Inventors
- 👤 Richard W. Babbitt
- 👤 Richard A. Stern
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:59
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/18; H01P1/19
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
117 words
A ferrite phase shifter for use in a dielectric waveguide transmission line, said ferrite phase shifter comprising a length of ferrite material of the same cross-sectional dimension as that of the dielectric waveguide and said ferrite material being so positioned as to become a section of the transmission line, a thin plastic layer on the top and bottom of the ferrite and a metal plate on each piece of plastic, and a wire coil wrapped around the length of this multilayer structure to provide a d.c. magnetic biasing field along the axil length of the ferrite for enabling the magnetization of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
Claim 2
Dependent Claim
117 words
A ferrite phase shifter for use in a dielectric waveguide transmission line, said ferrite phase shifter comprising a length of ferrite material of the same cross-sectional dimension as that of the dielectric waveguide and said ferrite material being so positioned as to become a section of the transmission line, a thin plastic layer on the top and bottom of the ferrite and a metal plate on each piece of plastic, and a wire coil wrapped around the length of this multilayer structure to provide a d.c. magnetic biasing field along the axil length of the ferrite for enabling the magnetization of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
Claim 3
Dependent Claim
27 words
A ferrite phase shifter according to claim 1 wherein the ferrite material has a saturation magnetization greater than 3000 and a dielectric loss tangent less than 0.005.
Claim 4
Dependent Claim
26 words
A ferrite phase shifter according to claim 2 wherein the ferrite material is selected from the group consisting of nickel zinc ferrite and lithium zinc ferrite.
Claim 5
Dependent Claim
16 words
A ferrite phase shifter according to claim 3 wherein the ferrite material is nickel zinc ferrite.
Claim 6
Dependent Claim
16 words
A ferrite phase shifter according to claim 3 wherein the ferrite material is lithium zinc ferrite.
Claim 7
Dependent Claim
18 words
A ferrite phase shifter according to claim 1 wherein the plastic layer is a thermoset cross-linked styrene copolymer.
Claim 8
Dependent Claim
132 words
A dielectric waveguide transmission line comprising a first length of a dielectric waveguide material and second length of a dielectric waveguide material having the same cross sectional dimensions as said first length of dielectric waveguide material, said first and second lengths being joined by a ferrite phase shifter comprising a length of ferrite of the same cross sectional dimension as that of the first and second lengths of dielectric waveguide material, a thin plastic layer on the top and bottom of the ferrite and a metal plate on each piece of plastic, and a wire coil wrapped around the length of this multilayer structure to provide a d.c. magnetic biasing field along the axial length of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
Claim 9
Dependent Claim
132 words
A dielectric waveguide transmission line comprising a first length of a dielectric waveguide material and second length of a dielectric waveguide material having the same cross sectional dimensions as said first length of dielectric waveguide material, said first and second lengths being joined by a ferrite phase shifter comprising a length of ferrite of the same cross sectional dimension as that of the first and second lengths of dielectric waveguide material, a thin plastic layer on the top and bottom of the ferrite and a metal plate on each piece of plastic, and a wire coil wrapped around the length of this multilayer structure to provide a d.c. magnetic biasing field along the axial length of the ferrite resulting in a reciprocal phase shift or change in electrical length within the structure.
Claim 10
Dependent Claim
28 words
A dielectric waveguide transmission line according to claim 7 wherein the ferrite material has a saturation magnetization greater than 3000 and a dielectric loss tangent less than 0.005.
Claim 11
Dependent Claim
27 words
A dielectric waveguide transmission line according to claim 8 wherein the ferrite material is selected from the group consisting of nickel zinc ferrite and lithium zinc ferrite.
Claim 12
Dependent Claim
17 words
A dielectric waveguide transmission line according to claim 9 wherein the ferrite material is nickel zinc ferrite.
Claim 13
Dependent Claim
17 words
A dielectric waveguide transmission line according to claim 9 wherein the ferrite material is lithium zinc ferrite.
Claim 14
Dependent Claim
34 words
A dielectric waveguide transmission line according to claim 7 wherein the dielectric waveguide material has a loss tangent at microwave frequencies of less than 0.001 and a dielectric constant between about 9 and 38.
Claim 15
Dependent Claim
25 words
A dielectric waveguide transmission line according to claim 12 wherein the dielectric waveguide material is selected from the group consisting of magnesium titanate and alumina.
Claim 16
Dependent Claim
17 words
A dielectric waveguide transmission line according to claim 13 wherein the dielectric waveguide material is magnesium titanate.
Claim 17
Dependent Claim
16 words
A dielectric waveguide transmission line according to claim 13 wherein the dielectric waveguide material is alumina.
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) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |