Composite hexagonal ferrite materials

Patent metadata

Field	Value
Publication number	US-2021323873-A1
Application number	US-202117218818-A
Country	US
Kind code	A1
Filing date	Mar 31, 2021
Priority date	Aug 26, 2016
Publication date	Oct 21, 2021
Grant date	—

Abstract

Disclosed herein are embodiments of composite hexagonal ferrite materials formed from a combination of Y phase and Z phase hexagonal ferrite materials. Advantageously, embodiments of the material can have a high resonant frequency as well as a high permeability. In some embodiments, the materials can be useful for magnetodielectric antennas.

First claim

1 . (canceled)

2 . A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition having a formula Sr 2-2x Na 2x Zr x Co 2-x Fe 12 O 22 or Sr 2-x Na x In x Co 2-x Fe 12 O 22 , 0≤x<1; and a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material.

3 . The composite hexagonal ferrite material of claim 2 wherein 0<x<1.

4 . The composite hexagonal ferrite material of claim 2 wherein the doped-in z-phase hexagonal ferrite composition has a formula Sr 3-x′-2y′ Ba x′ Na 2y′ Co 2-y′ Zr y′ Fe 24 O 41 , 0≤x′<3 and 0≤y′<1.

5 . The composite hexagonal ferrite material of claim 2 wherein 0<x<1 and the doped-in z-phase hexagonal ferrite composition has a formula Sr 3-x′-2y′ Ba x′ Na 2y′ Co 2-y′ Zr y′ Fe 24 O 41 , 0<x′<3 and 0<y′<1.

6 . The composite hexagonal ferrite material of claim 2 wherein the doped-in z-phase hexagonal ferrite composition has a formula Sr 1-x′-y′ Ba x′ Na y′ Co 2-y′ In y′ Fe 24 O 41 , 0≤x′<3 and 0≤y′<1.

7 . The composite hexagonal ferrite material of claim 2 wherein 0<x<1 and the doped-in z-phase hexagonal ferrite composition has a formula Sr 3-x′-y′ Ba x′ Na y′ Co 2-y′ In y′ Fe 24 O 41 , 0<x′<3 and 0<y′<1.

8 . An antenna formed from the composite hexagonal ferrite material of claim 2 .

9 . A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition; and a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material having a formula Sr 3-x-2y Ba x Na 2y Co 2-y Zr y Fe 24 O 41 or Sr 3-x-y Ba x Na y Co 2-y In y Fe 24 O 41 , 0≤x<3, and 0≤y<1.

10 . The composite hexagonal ferrite material of claim 9 wherein 0<x<3, and 0<y<1.

11 . The composite hexagonal ferrite material of claim 9 wherein the base y-phase hexagonal ferrite composition has a formula Sr 2-2x′ Na 2x′ Zr x′ Co 2-x′ Fe 12 O 22 , 0≤x′<1.

12 . The composite hexagonal ferrite material of claim 9 wherein 0<x<3, 0<y<1, and the base y-phase hexagonal ferrite composition has a formula Sr 2-2x′ Na 2x′ Zr x′ Co 2-x′ Fe 12 O 22 , 0≤x′<1.

13 . The composite hexagonal ferrite material of claim 9 wherein the base y-phase hexagonal ferrite composition has a formula Sr 2-x′ Na x′ In x′ Co 2-x′ Fe 12 O 22 , 0≤x′<1.

14 . The composite hexagonal ferrite material of claim 9 wherein 0<x<3, 0<y<1, and the base y-phase hexagonal ferrite composition has a formula Sr 2-x′ Na x′ In x′ Co 2-x′ Fe 12 O 22 , 0≤x′<1.

15 . An antenna formed from the composite hexagonal ferrite material of claim 9 .

16 . A composite hexagonal ferrite material comprising:
a base y-phase hexagonal ferrite composition having a formula Sr 2-x Na x Co 2-x Sc x Fe 12 O 22 , 0<x<1; and a doped-in z-phase hexagonal ferrite composition to form the composite hexagonal ferrite material, the doped-in z-phase hexagonal ferrite composition having a formula Sr 3-x-y Ba x Na y Co 2-y Sc y Fe 24 O 41 , 0<x<3, 0<y<1.5.

17 . The composite hexagonal ferrite material of claim 16 wherein the composite hexagonal ferrite material includes two phases.

18 . The composite hexagonal ferrite material of claim 16 wherein the composite hexagonal ferrite material has a real permeability of between 3 and 7 at 1 GHz.

19 . The composite hexagonal ferrite material of claim 16 wherein the composite hexagonal ferrite material has a real permeability of greater than 6 at 1 GHz.

20 . The composite hexagonal ferrite material of claim 16 wherein the y-phase hexagonal ferrite composition includes Sr 1.6 Na 0.4 Sc 0.4 Co 1.6 Fe 12 O 22 .

21 . The composite hexagonal ferrite material of claim 16 wherein the doped-in z-phase hexagonal ferrite composition includes Ba 1.4 Sr 0.8 Na 0.8 Sc 0.8 Co 1.2 Fe 12 O 22 .

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David
• Polisetty Srinivas
• Griffith Constance M

Classifications

• H01F1/11 Primary

  in the form of particles {(for magnetic record carriers G11B5/70626)} · CPC title

• C01G51/68

  containing rare earths, e.g. (La0.3Sr0.7)CoO3 · CPC title

• C04B35/2633

  containing barium, strontium or calcium · CPC title

• C01P2004/82

  two phases having the same anion, e.g. both oxidic phases · CPC title

• C04B2235/767

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