Oxide ceramic and ceramic electronic component
US-9815742-B2 · Nov 14, 2017 · US
Increased resonant frequency alkali-doped Y-phase hexagonal ferrites
US10032547B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10032547-B2 |
| Application number | US-201514887716-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 20, 2015 |
| Priority date | Oct 24, 2014 |
| Publication date | Jul 24, 2018 |
| Grant date | Jul 24, 2018 |
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Abstract
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Disclosed herein are embodiments of an enhanced resonant frequency hexagonal ferrite material, such as Y-phase hexagonal ferrite material, and methods of manufacturing. In some embodiments, sodium or potassium can be added into the crystal structure of the hexagonal ferrite material in order to achieve improved resonant frequencies in the range of 500 MHz to 1 GHz useful for radiofrequency applications.
First claim
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What is claimed is: 1. A method for increasing the resonant frequency of a hexagonal ferrite material, the method comprising: providing a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 ; and doping the hexagonal ferrite with Na, K or other univalent alkali metal on an Sr site and charge compensating with scandium or indium on a cobalt site. 2. The method of claim 1 wherein the hexagonal ferrite material is doped with silicon, aluminum, manganese, or any combination of the three. 3. The method of claim 1 wherein the hexagonal ferrite is doped with silicon acting as a grain growth inhibitor. 4. The method of claim 1 wherein the hexagonal ferrite is doped with manganese, preventing reduction of the iron in the composition to Fe 3+ . 5. The method of claim 1 wherein scandium is used for charge compensating. 6. The method of claim 1 wherein indium is used for charge compensating. 7. The method of claim 1 wherein the hexagonal ferrite has a loss factor of less than about 6 at a frequency of 1 GHz. 8. A hexagonal ferrite material having enhanced resonant frequency comprising: a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 , the material being doped with Na, K or other univalent alkali metal on an Sr site and including scandium or indium on a cobalt site. 9. The hexagonal ferrite material of claim 8 wherein the hexagonal ferrite material is doped with silicon, aluminum, manganese, or any combination of the three. 10. The hexagonal ferrite material of claim 8 wherein the hexagonal ferrite is doped with silicon acting as a grain growth inhibitor. 11. The hexagonal ferrite material of claim 8 wherein the hexagonal ferrite is doped with manganese preventing reduction of the iron in the composition to Fe 3+ . 12. The hexagonal ferrite material of claim 8 wherein scandium is used for charge compensating. 13. The hexagonal ferrite material of claim 8 wherein indium is used for charge compensating. 14. The hexagonal ferrite material of claim 8 wherein the hexagonal ferrite has a loss factor of less than about 6 at a frequency of 1 GHz. 15. A radiofrequency device comprising: a Y phase hexagonal ferrite material having the composition Sr 2 Co 2 Fe 12 O 22 , the material being doped with Na, K or other univalent alkali metal on an Sr site and including scandium or indium on a cobalt site. 16. The radiofrequency device of claim 15 wherein the hexagonal ferrite material is doped with silicon, aluminum, manganese, or any combination of the three. 17. The radiofrequency device of claim 15 wherein scandium is used for charge compensating. 18. The radiofrequency device of claim 15 wherein indium is used for charge compensating. 19. The radiofrequency device of claim 15 wherein the hexagonal ferrite has a loss factor of less than about 6 at a frequency of 1 GHz. 20. The radiofrequency device of claim 15 wherein the device is an antenna.
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Classifications
Other ferrites containing alkaline earth metals or lead · CPC title
based on ferrites · CPC title
Manganese oxides, manganates, rhenium oxides or oxide-forming salts thereof, e.g. MnO · CPC title
Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide · CPC title
Alkali metal oxides or oxide-forming salts thereof · CPC title
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- What does patent US10032547B2 cover?
- Disclosed herein are embodiments of an enhanced resonant frequency hexagonal ferrite material, such as Y-phase hexagonal ferrite material, and methods of manufacturing. In some embodiments, sodium or potassium can be added into the crystal structure of the hexagonal ferrite material in order to achieve improved resonant frequencies in the range of 500 MHz to 1 GHz useful for radiofrequency appl…
- Who is the assignee on this patent?
- Skyworks Solutions Inc
- What technology area does this patent fall under?
- Primary CPC classification H01F1/348. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Jul 24 2018 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).