Incorporation of oxides into ferrite material for improved radio radiofrequency properties

Patent metadata

Field	Value
Publication number	US-10971288-B2
Application number	US-201916294151-A
Country	US
Kind code	B2
Filing date	Mar 6, 2019
Priority date	Oct 24, 2014
Publication date	Apr 6, 2021
Grant date	Apr 6, 2021

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 hexagonal ferrite material, such as those including strontium. In some embodiments, oxides consistent with the stoichiometry of Sr3Co2Fe24O41, SrFe12O19 or CoFe2O4 can be used form an enhanced hexagonal ferrite material.

First claim

What is claimed is:

1. An improved hexagonal ferrite material having increased magnetic properties, the material comprising:
a Y-phase hexagonal ferrite having a composition Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 ; and
an oxide having a composition Sr 3 Co 2 Fe 24 O 41 , the material having a Q value of greater than about 20 at 800 MHz and a permeability of between 6-8 at 800 MHz to 1 GHz.

2. The material of claim 1 wherein the material includes about 2 wt. % Sr 3 Co 2 Fe 24 O 41 .

3. The material of claim 2 wherein the material includes 2 wt. % Sr 3 Co 2 Fe 24 O 41 .

4. The material of claim 1 wherein the Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 is a first phase and the Sr 3 Co 2 Fe 24 O 41 is a second phase.

5. The material of claim 1 wherein the Sr 3 Co 2 Fe 24 O 41 is dissolved into the Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 .

6. The material of claim 1 wherein the material has a Q value of greater than about 15 at 1 GHz.

7. The material of claim 1 wherein the material has a dielectric constant of about 10 to about 11.

8. A radiofrequency device incorporating the hexagonal ferrite of claim 1 .

9. A high frequency antenna comprising a hexagonal ferrite material including a Y-phase hexagonal ferrite having a composition Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 , and an oxide having a composition Sr 3 Co 2 Fe 24 O 41 , the material having a Q value of greater than about 20 at 800 MHz and a permeability of between 6-8 at 800 MHz to 1 GHz.

10. The antenna of claim 9 wherein the material includes about 2 wt. % Sr 3 Co 2 Fe 24 O 41 .

11. The antenna of claim 9 wherein the Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 is a first phase and the Sr 3 Co 2 Fe 24 O 41 is a second phase.

12. The antenna of claim 9 wherein the Sr 3 Co 2 Fe 24 O 41 is dissolved into the Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 .

13. The antenna of claim 9 wherein the material has a Q value of greater than about 15 at 1 GHz.

14. The antenna of claim 9 wherein the material has a dielectric constant of about 10 to about 11.

15. A radiofrequency device incorporating the antenna of claim 9 .

16. A radiofrequency circulator comprising a hexagonal ferrite material including a Y-phase hexagonal ferrite having a composition Sr 1.6 Na 0.4 Co 1.6 Sc 0.4 Fe 11 O 22 , and an oxide having a composition Sr 3 Co 2 Fe 24 O 41 , the material having a Q value of greater than about 20 at 800 MHz and a permeability of between 6-8 at 800 MHz to 1 GHz.

17. The circulator of claim 16 wherein the material includes about 2 wt. % Sr 3 Co 2 Fe 24 O 41 .

18. The circulator of claim 16 wherein the material has a Q value of greater than about 15 at 1 GHz.

19. The circulator of claim 16 wherein the material has a dielectric constant of about 10 to about 11.

20. A radiofrequency device incorporating the circulator of claim 16 .

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

• 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

• H01F1/10

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

• C04B2235/3229

  Cerium oxides or oxide-forming salts thereof · CPC title