Increased resonant frequency potassium-doped hexagonal ferrite

Patent metadata

Field	Value
Publication number	US-11776718-B2
Application number	US-202117483053-A
Country	US
Kind code	B2
Filing date	Sep 23, 2021
Priority date	Oct 24, 2014
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

Disclosed herein are embodiments of an enhanced resonant frequency hexagonal ferrite material and methods of manufacturing. The hexagonal ferrite material can be Y-phase strontium hexagonal ferrite material. In some embodiments, strontium can be substituted out for a trivalent or tetravalent ion composition including potassium, thereby providing for advantageous properties.

First claim

What is claimed is:

1. A doped Y-phase hexagonal ferrite material, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a trivalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−x K x Co 2−x M x Fe 12 O 22 , M being the trivalent ion and the value of x being 0.2<x<0.7.

2. The material of claim 1 wherein M is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, and any of the lanthanide ions.

3. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 .

4. The material of claim 3 wherein a loss factor of the doped Y-phase hexagonal material is below 0.5 at 1 GHz.

5. The material of claim 3 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.

6. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.5 K 0.5 Co 1.5 Sc 0.5 Fe 12 O 22 .

7. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 .

8. The material of claim 7 wherein a loss factor of the doped Y- phase hexagonal material is below 0.5 at 1 GHz.

9. The material of claim 7 wherein a permeability of the doped Y-phase hexagonal material is greater than 3.

10. The material of claim 1 wherein the doped Y-phase hexagonal material has a composition of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

11. The material of claim 1 wherein the doped Y-phase hexagonal material has a loss factor of below 1 at 1 GHz.

12. A radio frequency antenna including the material of claim 1 .

13. A radio frequency device including the material of claim 1 .

14. A radio frequency antenna, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a trivalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−x K x Co 2−x M x Fe 12 O 22 , being the trivalent ion and the value of x being 0<x≤1.5.

15. A doped Y-phase hexagonal ferrite material, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a tetravalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−2x K 2x Co 2−x N x Fe 12 O 22 , N being the tetravalent ion and the value of x being 0.2<x<0.5.

16. The material of claim 15 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, and Tb.

17. The material of claim 15 wherein N is Ge.

18. The material of claim 15 wherein the doped Y-phase hexagonal ferrite material has a loss factor below 1 at 1 GHz.

19. A radio frequency antenna including the material of claim 15 .

20. A radio frequency device including the material of claim 15 .

21. A radio frequency antenna, comprising:
a doped Y-phase hexagonal ferrite material including potassium substituted for at least some strontium and including a tetravalent ion substituted for at least some cobalt, the doped Y-phase hexagonal ferrite material having a composition Sr 2−2x K 2x Co 2−x N x Fe 12 O 22 , N being the tetravalent ion and the value of x being 0<x≤0.75.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David

Classifications

• H01F1/01 Primary

  of inorganic materials (H01F1/44 takes precedence) · CPC title

• C04B35/26

  based on ferrites · CPC title

• C04B35/2633

  containing barium, strontium or calcium · CPC title

• H01F1/10

  non-metallic substances, e.g. ferrites {, e.g. [(Ba,Sr)O(Fe2O3)6] ferrites with hexagonal structure} · CPC title

• H01F1/348 Primary

  Hexaferrites with decreased hardness or anisotropy, i.e. with increased permeability in the microwave (GHz) range, e.g. having a hexagonal crystallographic structure · CPC title