US3568106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetostatic delay line
Assignee: BAE Systems Aerospace Inc
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Filing: 1969-09-17
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Granted: 1971-03-02
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Expires: 1989-09-17
Abstract
Abstract A wide band magnetostatic delay line having a sample of single crystal yttrium iron garnet (YIG) positioned in an axial bias field. The YIG sample is enclosed in a cutoff waveguide and separated from the walls of the guide by several guide wavelengths, measured in the YIG sample. The input and output probes are backed up by polycrystal YIG pieces which cause the bias field to be substantially uniform in the single crystal YIG. The uniform bias field causes a magnetostatic wave to propagate with a substantially constant wavelength. The polycrystal YIG backup pieces also serve to provide substantially uniform permeability to the electromagnetic fields associated with the input and output probes in order to provide efficient coupling over a wide bandwidth. Longer delays are made possible by cascading several single crystal YIG pieces along their longitudinal axis.
Inventors
- 👤 Richard La Rosa
- 👤 Carmine F Vasile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:32
CPC Classifications
H; H03; H03H; H03H2/00; H03H2/001
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
246 words
A magnetostatic delay line, comprising: a sample of single crystal magnetic insulator material having first and second faces; an input device including a first current-carrying member contiguous with said first face for coupling electromagnetic energy to said magnetic insulator material as a result of high frequency current flow in said first current-carrying member; means for subjecting the magnetic insulator material to an axial magnetic bias field that is substantially uniform in the absence of said magnetic insulator material for causing said electromagnetic energy to propagate in said magnetic insulator material as a magnetostatic wave; an output device including a second current-carrying member contiguous with said second face for coupling electromagnetic energy from the magnetic insulator material to produce a signal in said second current-carrying member representative of the high frequency signal in said first current-carrying member delayed by a predetermined amount; a nonmagnetic shielding member surrounding said single crystal magnetic insulator material in the region of said currentcarrying members for preventing undelayed leakage of electromagnetic energy from said first current-carrying member to said second current-carrying member; and first and second samples of magnetic insulator material in close proximity to said first and second faces respectively for increasing the uniformity of said magnetic bias field so that the wavelength of said propagating magnetostatic wave remains substantially constant in said single crystal magnetic insulator material without reducing the amount of electromagnetic energy that is coupled between said input and output devices and said single crystal magnetic insulator material.
Claim 2
Dependent Claim
246 words
A magnetostatic delay line, comprising: a sample of single crystal magnetic insulator material having first and second faces; an input device including a first current-carrying member contiguous with said first face for coupling electromagnetic energy to said magnetic insulator material as a result of high frequency current flow in said first current-carrying member; means for subjecting the magnetic insulator material to an axial magnetic bias field that is substantially uniform in the absence of said magnetic insulator material for causing said electromagnetic energy to propagate in said magnetic insulator material as a magnetostatic wave; an output device including a second current-carrying member contiguous with said second face for coupling electromagnetic energy from the magnetic insulator material to produce a signal in said second current-carrying member representative of the high frequency signal in said first current-carrying member delayed by a predetermined amount; a nonmagnetic shielding member surrounding said single crystal magnetic insulator material in the region of said currentcarrying members for preventing undelayed leakage of electromagnetic energy from said first current-carrying member to said second current-carrying member; and first and second samples of magnetic insulator material in close proximity to said first and second faces respectively for increasing the uniformity of said magnetic bias field so that the wavelength of said propagating magnetostatic wave remains substantially constant in said single crystal magnetic insulator material without reducing the amount of electromagnetic energy that is coupled between said input and output devices and said single crystal magnetic insulator material.
Claim 3
Dependent Claim
22 words
A magnetostatic delay line as claimed in claim 1 in which the single crystal magnetic insulator material is yttrium iron garnet (YIG).
Claim 4
Dependent Claim
44 words
A magnetostatic delay line as claimed in claim 1 which includes a plurality of samples of single crystal magnetic insulator material cascaded along their longitudinal axis and in which said input and output devices are positioned at the opposite ends of said cascaded samples.
Claim 5
Dependent Claim
22 words
A magnetostatic delay line as claimed in claim 3 in which the single crystal magnetic insulator material is yttrium iron garnet (YIG).
Claim 6
Dependent Claim
40 words
A magnetostatic delay line as claimed in claim 3 in which the single crystal magnetic insulator material is yttrium iron garnet and in which the cascaded samples of yttrium iron garnet are separated from each other by thin dielectric spacers.
Claim 7
Dependent Claim
49 words
A magnetostatic delay line as claimed in claim 3 in which the single crystal magnetic insulator material is yttrium iron garnet and in which the cascaded samples of yttrium iron garnet are separated from each other by thin dielectric spacers having a thickness between .001 inch and .010 inch.
Claim 8
Dependent Claim
52 words
A magnetostatic delay line as claimed in claim 1 in which the single crystal magnetic insulator material is yttrium iron garnet (YIG) and in which the nonmagnetic shielding member comprises a metal wall cutoff waveguide whose internal dimensions are less than that required to propagate said electromagnetic energy as a hollow waveguide.
Claim 9
Dependent Claim
37 words
A magnetostatic delay line as claimed in claim 7 in which the single crystal YIG sample is separated from the interior wall of the metal waveguide by several wavelengths of the magnetostatic energy in the YIG sample.
Claim 10
Dependent Claim
28 words
A magnetostatic delay line as claimed in claim 2 in which said first and second samples of magnetic insulator material are samples of polycrystal yttrium iron garnet (YIG).
Claim 11
Dependent Claim
32 words
A magnetostatic delay line as claimed in claim 9 in which the first and second samples of polycrystal YIG have substantially the same cross section as the sample of single crystal YIG.
Claim 12
Dependent Claim
192 words
A magnetostatic delay line comprising: a plurality of samples of single crystal magnetic insulator material cascaded along their longitudinal axis having first and second faces at the opposite ends of the cascaded combination; an input device including a first current-carrying member contiguous with said first face for coupling electromagnetic energy to said magnetic insulator material as a result of high frequency current flow in said first current-carrying member; means for subjecting the magnetic insulator material to an axial magnetic bias field that is substantially uniform in the absence of said magnetic insulator material for causing said electromagnetic energy to propagate in said magnetic insulator material as a magnetostatic wave; an output device including a second current-carrying member contiguous with said second face for coupling electromagnetic energy from the magnetic insulator material to produce a signal in said second current-carrying member representative of the high frequency signal in said first current-carrying member delayed by a predetermined amount; and a nonmagnetic shielding member surrounding said single crystal magnetic insulator material in the region of said current-carrying members for preventing undelayed leakage of electromagnetic energy from said first current-carrying member to said second current-carrying member.
Claim 13
Dependent Claim
192 words
A magnetostatic delay line comprising: a plurality of samples of single crystal magnetic insulator material cascaded along their longitudinal axis having first and second faces at the opposite ends of the cascaded combination; an input device including a first current-carrying member contiguous with said first face for coupling electromagnetic energy to said magnetic insulator material as a result of high frequency current flow in said first current-carrying member; means for subjecting the magnetic insulator material to an axial magnetic bias field that is substantially uniform in the absence of said magnetic insulator material for causing said electromagnetic energy to propagate in said magnetic insulator material as a magnetostatic wave; an output device including a second current-carrying member contiguous with said second face for coupling electromagnetic energy from the magnetic insulator material to produce a signal in said second current-carrying member representative of the high frequency signal in said first current-carrying member delayed by a predetermined amount; and a nonmagnetic shielding member surrounding said single crystal magnetic insulator material in the region of said current-carrying members for preventing undelayed leakage of electromagnetic energy from said first current-carrying member to said second current-carrying member.
Claim 14
Dependent Claim
30 words
A magnetostatic delay line as claimed in claim 11 in which the plurality of single crystal samples of magnetic insulator material are single crystal samples of yttrium iron garnet (YIG).
Claim 15
Dependent Claim
36 words
A magnetostatic delay line as claimed in claim 12 in which the plurality of single crystal YIG samples are separated from each other by thin dielectric spacers having a thickness between .001 inch and .010 inch.
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) | 1974-03-01 | 1974-08-31 | 1975-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-01 | 1978-08-31 | 1979-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-01 | 1982-08-31 | 1983-03-02 | $7700.00 | Window Closed / Lapsed |