Claims
- 1. 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.
- 2. 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.
- 3. A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel cobalt ferrite.
- 4. A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel zinc ferrite.
- 5. A dielectric waveguide ferrite resonance isolator according to claim 2 wherein the hexagonal ferrite material is barium oxide substituted nickel aluminum ferrite.
- 6. 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.
- 7. 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.
- 8. 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.
- 9. 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.
- 10. 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.times.10.sup.-4 and a dielectric constant from about 9 to about 30.
- 11. 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.
- 12. A dielectric waveguide ferrite resonance isolator according to claim 11 wherein the dielectric waveguide material is magnesium titanate.
- 13. A dielectric waveguide ferrite resonance isolator according to claim 11 wherein the dielectric waveguide material is alumina.
- 14. 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.
- 15. 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.
Government Interests
The invention described herein may be manufactured, used, and licensed by or for the Government for governmental purposes without the payment to us of any royalty thereon.
US Referenced Citations (4)
Non-Patent Literature Citations (1)
Entry |
Ved P. Nanda, "A New Form of Ferrite Device for Millimeter-Wave Integratedircuits," IEE Transactions on MTT, Nov. 1976, pp. 876-879. |