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US 4,605,911 AGranted
Magnetic bias and delay linearity in a magnetostatic wave delay line
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorKorda K. Jin
Life of this patent
Estimating the term…
Abstract
A cascade combination of magnetostatic delay line elements operating in different signal propagation modes for the purpose of achieving dispersion cancellation; magnetic bias control of the attained frequency-dependent delay and a magnetic bias field establishing apparatus for providing the tubular, laminar magnetic flux needed for backward volume wave operation of a magnetostatic delay element are also included.
Claims21
Controllable laminar magnetic flux generating apparatus comprising:
- first and second sources of magnetomotive force located at two displaced points along an axis and polarized to establish magnetic field flux lines starting at said first source, tending to extend along said axis in an outward curving line pattern, having flux line components both parallel and perpendicular to said axis and ending at said second source;
- a third distributed element controllable source of magnetomotive force located in lengthwise dispersion along said axis between said first and second sources for subtractively and additionally modulating the strength of said first and second source magnetic field flux lines in response to a control signal;
- means located along said axis for diverting said magnetic field flux lines from said curving line pattern to a pattern of flux lines extending parallel to said axis between said first and second sources;
- and
- a cavity receptacle concentric with said axis and communicating therealong between said first and second sources.
2 more elements
Magnetostatic delay line apparatus comprising:
- means including a primary source of magnetomotive force for generating curved magnetic field flux lines extending from terminus in said source lengthwise along an axis intersecting said source, said flux lines having vector components that are both parallel with and perpendicular to said axis, with said perpendicular components varying in magnitude with position along said axis;
- means located along said axis for generating magnetic flux that is perpendicular to said axis, opposite in polarity to said position varying perpendicular flux components and of predetermined strength for cancelling said axial position varying perpendicular flux components, thereby leaving flux components that are parallel with said axis;
- and
- a backward volume wave magnetostatic delay line element lengthwise located in said parallel flux component magnetic field.
1 more element
Magnetostatic delay line apparatus comprising:
- means including a primary source of magnetomotive force for generating curved magnetic field flux lines extending lengthwise along an axis intersecting said source, said curved flux lines having vector components that are both parallel with and perpendicular to said axis with said perpendicular components varying in magnitude with position along said axis,
- said primary source of magnetomotive force including first and second permanent magnets located at displaced positions along said axis at opposite ends of an axially disposed cavity,
- said primary source of magnetomotive force also including an electrically energized winding source of controllable strength magnetomotive force capable of modulating the magnetomotive force generated by said permanent magnets;
- means located along said axis for generating magnetic flux that is oriented perpendicular to said axis, opposite in polarity to said position varying perpendicular flux components and of predetermined strength to cancel said axial position varying perpendicular flux components, thereby leaving flux components that are parallel with said axis;
- a backward volume wave magnetostatic delay line element lengthwise located in said axially disposed cavity in said parallel flux component magnetic field;
- a magnetostatic surface wave delay line element connected in signal path series with said backward volume wave delay line element;
- and
- means for generating magnetic flux capable of magnetically biasing said magnetostatic surface wave element into a predetermined magnetic operating mode.
5 more elements
Magnetostatic delay line apparatus comprising:
- means including a primary source of magnetomotive force for generating curved magnetic field flux lines extending lengthwise along an axis intersecting said source, said curved flux lines having vector components that are both parallel with and perpendicular to said axis with said perpendicular components varying in magnitude with position along said axis,
- said primary source of magnetomotive force including first and second permanent magnets located at displaced positions along said axis at opposite ends of an axially disposed cavity,
- said primary source of magnetomotive force also including an electrically energized winding source of controllable strength magnetomotive force capable of modulating the magnetomotive force generated by said permanent magnets;
- means located along said axis for generating magnetic flux that is oriented perpendicular to said axis, opposite in polarity to said position varying perpendicular flux components and of predetermined strength to cancel said axial position varying perpendicular flux components, thereby leaving flux components that are parallel with said axis;
- a backward volume wave magnetostatic delay line element lengthwise located in said axially disposed cavity in said parallel flux component magnetic field;
- a magnetostatic forward volume wave delay line element connected in signal path series with said backward volume wave delay line element;
- and
- means for generating magnetic flux capable of magnetically biasing said magnetostatic forward volume wave element into a predetermined magnetic operating mode.
5 more elements
Dependencies are inferred from the claim text.