Increased resonant frequency potassium-doped hexagonal ferrite

Patent metadata

Field	Value
Publication number	US-2016118170-A1
Application number	US-201514887679-A
Country	US
Kind code	A1
Filing date	Oct 20, 2015
Priority date	Oct 24, 2014
Publication date	Apr 28, 2016
Grant date	—

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:
providing a y-phase strontium hexagonal ferrite material; and substituting at least some of strontium with a trivalent ion composition including potassium or a tetravalent ion composition including potassium to form a high resonant frequency hexagonal ferrite, the 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 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.

2 . The method of claim 1 wherein x is from 0 to 1.5 in the trivalent substitution and from 0 to 0.75 in the tetravalent substitution.

3 . The method of claim 1 where in the y-phase strontium hexagonal ferrite material includes Sr 2 Co 2 Fe 12 O 22 .

4 . 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.

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

6 . The method of claim 1 wherein substituting at least some of the strontium with potassium includes adding potassium carbonate to the y-phase strontium hexagonal ferrite material.

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

8 . 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 .

9 . 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 .

10 . A antenna for use in radiofrequency operations comprising:
a y-phase strontium hexagonal ferrite material having at least some of strontium substituted out for a trivalent ion composition including potassium or a tetravalent ion composition including potassium to form a high resonant frequency hexagonal ferrite, the 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 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.

11 . The antenna of claim 10 wherein x is from 0 to 1.5 in the trivalent substitution and from 0 to 0.75 in the tetravalent substitution.

12 . The antenna of claim 10 where in the y-phase strontium hexagonal ferrite material includes Sr 2 Co 2 Fe 12 O 22 .

13 . The antenna of claim 10 where the high resonant frequency hexagonal ferrite has a loss factor below 1 at 1 GhZ.

14 . The antenna of claim 10 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 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

15 . A potassium doped y-phase hexagonal ferrite material comprising:
a y-phase strontium hexagonal ferrite material having at least some of strontium substituted out for a trivalent ion composition including potassium or a tetravalent ion composition including potassium to form a high resonant frequency hexagonal ferrite, the 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 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.

16 . The doped y-phase hexagonal ferrite material of claim 15 wherein x is from 0 to 1.5 in the trivalent substitution and from 0 to 0.75 in the tetravalent substitution.

17 . The doped y-phase hexagonal ferrite material of claim 15 where in the y-phase strontium hexagonal ferrite material includes Sr 2 Co 2 Fe 12 O 22 .

18 . The doped y-phase hexagonal ferrite material of claim 15 wherein the potassium includes potassium carbonate.

19 . The doped y-phase hexagonal ferrite material of claim 15 where the high resonant frequency hexagonal ferrite has a loss factor below 1 at 1 GhZ.

20 . The doped y-phase hexagonal ferrite material of claim 15 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 1.5 K 0.5 Co 1.5 In 0.5 Fe 12 O 22 .

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

• C04B35/2641

  Compositions containing one or more ferrites of the group comprising rare earth metals and one or more ferrites of the group comprising alkali metals, alkaline earth metals or lead · CPC title

• H01F1/01 Primary

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

• C04B2235/3213

  Strontium oxides or oxide-forming salts thereof · CPC title