Enhanced magnetic loss y-phase hexagonal ferrite for magnetodielectric antenna applications

Patent metadata

Field	Value
Publication number	US-10461436-B2
Application number	US-201615371521-A
Country	US
Kind code	B2
Filing date	Dec 7, 2016
Priority date	Dec 11, 2015
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A hexagonal ferrite material includes a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 or Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<2, doped with a trivalent element, a tetravalent element, and/or a transition metal.

First claim

What is claimed is:

1. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<2, doped with up to 10 weight percent of a tetravalent element.

2. The hexagonal ferrite material of claim 1 wherein the tetravalent element substitutes for Fe 3+ ions on tetrahedral sites of the Y phase hexagonal ferrite material.

3. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 doped with up to 10 weight percent of a tetravalent element that substitutes for Fe 3+ ions on tetrahedral sites of the Y phase hexagonal ferrite material.

4. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 doped with up to 10 weight percent of a tetravalent element that is one of Si and Ge.

5. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<2, doped with up to 10 weight percent of a transition metal or Zn.

6. The hexagonal ferrite material of claim 5 wherein the transition metal is one of Mn and Ni.

7. The hexagonal ferrite material of claim 6 wherein the transition metal or Zn substitutes for Co ions on octahedral sites of the Y phase hexagonal ferrite material.

8. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 doped with up to 10 weight percent of one or more of Nb, Ta, W, and Mo.

9. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<2, doped with up to 10 weight percent of one or more of Nb, Ta, V, W and Mo.

10. The hexagonal ferrite material of claim 9 wherein the one or more of Nb, Ta, V, W, and Mo substitutes for one of Co ions and Fe ions in the Y phase hexagonal ferrite material.

11. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 doped with up to 10 weight percent of one of a trivalent dopant selected from the group including Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, or a lanthanide ion and a tetravalent dopant selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, or Tb.

12. A hexagonal ferrite material comprising a Y phase hexagonal ferrite material having the composition Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<2, doped with up to 10 weight percent of at least one of a trivalent dopant selected from the group including Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, or a lanthanide ion and a tetravalent dopant selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, or Tb.

13. The material of claim 12 having a deviation from the Y-phase stoichiometry of between about zero and about five weight percent of one or more of Sr, Co, or Fe and and/or one or more of the dopant components.

14. The material of claim 12 wherein x is about 0.4.

15. The material of claim 14 having a quality factor of up to about 20 at about 1 GHz.

16. The material of claim 15 having a real permeability of greater than about four at about 1 GHz.

17. A radio frequency circuit element formed from the material of claim 16 .

18. The radio frequency circuit element of claim 17 including one or more of an antenna, a circulator, an isolator, and an inductor.

19. A radio frequency circuit module including the radio frequency circuit element of claim 17 .

20. An electronic device including the radio frequency circuit module of claim 19 .

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David
• Polisetty Srinivas
• Griffith Constance M

Classifications

• C04B2235/3241

  Chromium oxides, chromates, or oxide-forming salts thereof · CPC title

• C04B2235/3279

  Nickel oxides, nickalates, or oxide-forming salts thereof · CPC title

• C04B2235/3284

  Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof · CPC title

• C04B2235/767

  Hexagonal symmetry, e.g. beta-Si3N4, beta-Sialon, alpha-SiC or hexa-ferrites · CPC title

• C04B2235/3262

  Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title