Claims
- 1. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals wherein the delay varies by a predetermined amount with frequency comprising:
- a body of yttrium iron garnet for propagating magnetostatic waves having a thickness in the range of 5 to 50 micrometers,
- first and second transducers located in spaced apart relationship for generating and receiving magnetostatic waves along a path in said body of yttrium iron garnet,
- a plurality of ground planes coupled together, said ground planes formed from a common metal block having a layer of plated gold, each ground plane having a predetermined length along said path in said material and spaced by a predetermined distance from said material.
- 2. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals, whereby the delay varies by a predetermined amount with frequency comprising:
- first material suitable for propagating magnetostatic waves,
- second material suitable for propagating magnetostatic waves spaced apart by a plurality of predetermined distances from said first material,
- a first transducer positioned to generate magnetostatic waves in said first material from said microwave signals coupled thereto which propagate along a path in said first material,
- a second transducer positioned to receive said magnetostatic waves in said first material to convert said magnetostatic waves to microwave signals.
- 3. The magnetostatic wave device of claim 2 wherein said first and second materials are spaced apart in a range from 5 to 50 micrometers.
- 4. The magnetostatic wave device of claim 2 wherein said first and second material are each in the range from 5 to 50 micrometers thick.
- 5. The magnetostatic wave device of claim 2 wherein said first and second material each includes yttrium iron garnet.
- 6. The magnetostatic wave device of claim 2 wherein said first and second material are separated by a layer of samarium doped GGG material.
- 7. The magnetostatic wave device of claim 2 wherein said first material is spaced from said second material by a plurality of predetermined spacings for a predetermined length along said propagation path.
- 8. The magnetostatic wave device of claim 2 wherein said distance between said first and second material is controlled by a layer of samarium doped GGG material having its upper surface etched to provide a plurality of spacings each having a predetermined length in the propagation direction.
- 9. The magnetostatic wave device of claim 2 wherein said first material and second material include yttrium iron garnet having a thickness from 5 to 50 micrometers.
- 10. A method for fabricating a magnetostatic wave device comprising:
- forming yttrium iron garnet on a substrate of GGG material,
- forming a layer of samarium doped GGG material over said YIG material,
- etching said samarium doped GGG material to form a plurality of thicknesses, each thickness having a predetermined length in the propagation direction,
- forming a second layer of YIG material over said samarium doped GGG material,
- forming a first and second transducer spaced apart at a first and second end of said second layer of YIG material.
- 11. The method of claim 10 further including the step of etching said samarium doped GGG material with hot phosphoric acid HPO.sub.3.
- 12. The method of claim 10 further including forming said first and second layer of YIG material in the thickness from 5 to 50 micrometers.
- 13. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals wherein the delay varies by a predetermined amount with frequency comprising:
- first material suitable for propagating magnetostatic waves,
- first and second transducers located in spaced apart relationship for generating and receiving magnetostatic waves along a path in said first material,
- a ground plane having a continuous non-linear spacing in the direction along said path from said material.
- 14. The magnetostatic wave device of claim 13 wherein said first material includes yttrium iron garnet.
- 15. The magnetostatic wave device of claim 13 wherein said first material is in the range from 5 to 50 micrometers thick.
- 16. The magnetostatic wave device of claim 13 wherein said continuous non-linear spacing is described by a second degree polynomial.
- 17. The magnetostatic wave device of claim 13 wherein said ground plane includes a layer of conductive material over a substrate of dielectric material having one side shaped to provide continuous non-linear spacing in the direction along said path.
- 18. The magnetostatic wave device of claim 17 wherein said dielectric material includes glass.
- 19. The magnetostatic wave device of claim 13 further including
- a second material suitable for propagating magnetostatic waves spaced apart from said first material.
- 20. The magnetostatic wave device of claim 19 wherein said second material is positioned above said first material and said ground plane.
- 21. The magnetostatic wave device of claim 13 wherein the spacing from said material in the direction orthogonal to said direction along said path is constant.
- 22. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals wherein the delay varies by a predetermined amount with frequency, comprising:
- (a) a body of material suitable for propagating magnetostatic waves;
- (b) first and second transducers located in spaced apart relationship for generating an receiving magnetostatic waves along a path in said material;
- (c) a plurality of ground planes include continuous metal surfaces to provide a continuous variation in spacing of said ground plane from said material.
- 23. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals wherein the delay varies by a predetermined amount with frequency, comprising:
- (a) a body of material for propagating magnetostatic waves;
- (b) first and second transducers located in spaced apart relationship for generating and receiving magnetostatic waves along a path in said material;
- (c) a plurality of ground planes decreasing in spacing from said material with distance from said first transducer.
- 24. A magnetostatic wave device operable within a biasing magnetic field for delaying microwave signals wherein the delay varies by a predetermined amount with frequency, comprising:
- (a) a body of material suitable for propagating magnetostatic waves;
- (b) first and second transducers located in spaced apart relationship for generating an receiving magnetostatic waves along a path in said material;
- (c) a plurality of ground planes which decrease from said first transducer to a minimum spacing from said material and then increase in spacing toward said second transducer.
GOVERNMENT CONTRACT
The Government has rights in this invention pursuant to Contract No. F19628-80-C-0150 awarded by the Department of the Air Force.
US Referenced Citations (5)