Increased resonant frequency potassium-doped hexagonal ferrite

Patent metadata

Field	Value
Publication number	US-10026530-B2
Application number	US-201514887679-A
Country	US
Kind code	B2
Filing date	Oct 20, 2015
Priority date	Oct 24, 2014
Publication date	Jul 17, 2018
Grant date	Jul 17, 2018

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 method for doping a Y-phase hexagonal ferrite material with potassium, the method comprising:
substituting in a trivalent ion composition including potassium and a trivalent ion or a tetravalent ion composition including potassium and a tetravalent ion to form a high resonant frequency hexagonal ferrite having a Y-phase strontium hexagonal ferrite structure, the high resonant frequency hexagonal ferrite composition being Sr 2-x K x Co 2-x M x Fe 12 O 22 when a trivalent ion is used for the substitution, M being any trivalent ion, and the high resonant frequency hexagonal ferrite composition being Sr 2-2x K 2x Co 2-x N x Fe 12 O 22 when a tetravalent ion is used for the substitution, N being any tetravalent ion, x being 0<x≤'1.5 in the trivalent substitution and 0<x≤0.75 in the tetravalent substitution.

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

3. The method of claim 1 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, or Tb.

4. The method of claim 1 wherein the potassium ion comes from potassium carbonate.

5. The method of claim 1 where the high resonant frequency hexagonal ferrite has a loss factor below 1 at 1 GHz.

6. The method of claim 1 wherein the high resonant frequency hexagonal ferrite has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 or Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 .

7. The method of claim 1 wherein the high resonant frequency hexagonal ferrite has a composition of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 or Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

8. A antenna for use in radiofrequency operations comprising:
a Y-phase strontium hexagonal ferrite material including a trivalent ion composition including potassium and a trivalent ion or a tetravalent ion composition including potassium and a tetravalent ion substituted in to form a high resonant frequency hexagonal ferrite, the high resonant frequency hexagonal ferrite composition being Sr 2-x K x Co 2-x M x Fe 12 O 22 when a trivalent ion is used for the substitution, M being any trivalent ion, and the high resonant frequency hexagonal ferrite composition being Sr 2-2x K 2x Co 2-x N x Fe 12 O 22 when a tetravalent ion is used for the substitution, N being any tetravalent ion, x being 0<x≤1.5 in the trivalent substitution and 0<x≤0.75 in the tetravalent substitution.

9. The antenna of claim 8 where the high resonant frequency hexagonal ferrite has a loss factor below 1 at 1 GHz.

10. The antenna of claim 8 wherein the high resonant frequency hexagonal ferrite has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 or Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 or Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 or Sr 15 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

11. A potassium doped Y-phase hexagonal ferrite material comprising:
a Y-phase strontium hexagonal ferrite material including a trivalent ion composition including potassium and a trivalent ion or a tetravalent ion composition including potassium and a tetravalent ion substituted in to form a high resonant frequency hexagonal ferrite, the high resonant frequency hexagonal ferrite composition being Sr 2-x K x Co 2-x M x Fe 12 O 22 when a trivalent ion is used for the substitution, M being any trivalent ion, and the high resonant frequency hexagonal ferrite composition being Sr 2-2x K 2x Co 2-x N x Fe 12 O 22 when a tetravalent ion is used for the substitution, N being any tetravalent ion, x being 0<x≤1.5 in the trivalent substation and 0<x≤0.75 in the tetravalent substitution.

12. The doped Y-phase hexagonal ferrite material of claim 11 where the high resonant frequency hexagonal ferrite has a loss factor below 1 at 1 GHz.

13. The doped Y-phase hexagonal ferrite material of claim 11 wherein the high resonant frequency hexagonal ferrite has a composition of Sr 1.75 K 0.25 Co 1.75 Sc 0.25 Fe 12 O 22 or Sr 1.75 K 0.25 Co 1.75 In 0.25 Fe 12 O 22 .

14. The doped Y-phase hexagonal ferrite material of claim 11 wherein the material is substituted with the trivalent ion.

15. The doped Y-phase hexagonal ferrite material of claim 11 wherein the material is substituted with the tetravalent ion.

16. The doped Y-phase hexagonal ferrite material of claim 11 wherein M is selected from the group consisting of Sc, Mn, In, Cr, Ga, Co, Ni, Fe, Yb, or any of the lanthanide ions.

17. The doped Y-phase hexagonal ferrite material of claim 11 wherein N is selected from the group consisting of Si, Ge, Ti, Zr, Sn, Ce, Pr, Hf, or Tb.

18. The doped Y-phase hexagonal ferrite material of claim 11 wherein the high resonant frequency hexagonal ferrite has a composition of Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 or Sr 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

19. The antenna of claim 8 wherein the material is substituted with the trivalent ion.

20. The antenna of claim 8 wherein the material is substituted with the tetravalent ion.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David

Classifications

• C04B35/2683

  Other ferrites containing alkaline earth metals or lead · CPC title

• C04B35/26

  based on ferrites · CPC title

• C04B2235/40

  Metallic constituents or additives not added as binding phase · CPC title

• C04B2235/3275

  Cobalt oxides, cobaltates or cobaltites or oxide forming salts thereof, e.g. bismuth cobaltate, zinc cobaltite · CPC title

• C04B2235/80

  Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title