Low temperature co-fireable dielectric materials

Patent metadata

Field	Value
Publication number	US-11715869-B2
Application number	US-202117364325-A
Country	US
Kind code	B2
Filing date	Jun 30, 2021
Priority date	Sep 8, 2017
Publication date	Aug 1, 2023
Grant date	Aug 1, 2023

Abstract

Disclosed herein are embodiments of low temperature co-fireable dielectric materials which can be used in conjunction with high dielectric materials to form composite structures, in particular for isolators and circulators for radiofrequency components. Embodiments of the low temperature co-fireable dielectric materials can be scheelite or garnet structures, for example barium tungstate. Adhesives and/or glue is not necessary for the formation of the isolators and circulators.

First claim

What is claimed is:

1. A composite material for use as a radiofrequency component comprising:
a low temperature fireable outer material, the low temperature fireable outer material having a garnet or scheelite structure and having the composition Bi 1-2x A 2x V 1-x M x O 4 , A being Li, Na, K, or combinations thereof, M being Mo, W, or combinations thereof, and x being between about 0 and about 0.45; and
a high dielectric inner material located within the outer material, the high dielectric inner material having a dielectric constant above 30, the low temperature fireable outer material and the high dielectric inner material being configured to be co-fired together at temperature between 650-900° C.

2. The composite material of claim 1 wherein the low temperature fireable outer material has a dielectric constant between 20 and 80.

3. A radio frequency circulator or isolator including the composite material of claim 1 .

4. The composite material of claim 1 wherein the low temperature fireable outer material and the high dielectric inner material are configured to be co-fired together at temperature without the use of adhesive or glue.

5. The composite material of claim 1 wherein x is between 0 and 0.45.

6. The composite material of claim 1 wherein the low temperature fireable outer material has a sintering temperature above 700° C.

7. A method of forming a composite material for use as an isolator or circulator in a radiofrequency device, the method comprising:
providing a low temperature fireable outer material, the low fireable outer material having a garnet or scheelite structure and having the composition Bi 1-2x A 2x V 1-x M x O 4 , A being Li, Na, K, or combinations thereof, M being Mo, W, or combinations thereof, and x being between about 0 and about 0.45;
entering a high dielectric inner material within an aperture in the low temperature fireable outer material, the high dielectric inner material having a dielectric constant above 30; and
co-firing the low temperature fireable outer material and the high dielectric inner material together at temperature between 650-900° C. to shrink the low temperature fireable outer material around an outer surface of the high dielectric inner material without the use of adhesive or glue.

8. The method of claim 7 wherein the low temperature fireable outer material has a dielectric constant between 20 and 80.

9. The method of claim 7 further comprising forming a radio frequency circulator or isolator including the composite material formed by the co-firing.

10. The method of claim 7 wherein the co-firing is performed without the use of adhesive or glue.

11. The method of claim 7 wherein x is between 0 and 0.45.

12. The method of claim 7 wherein the low temperature fireable outer material has a sintering temperature above about 700° C.

13. A composite material for use as a radiofrequency component comprising:
a low temperature fireable outer material, the low temperature fireable outer material having a garnet or scheelite structure and having the composition C 2 BiD 2 V 3 O 12 , C being Li, Na, K, or combinations thereof, and D being Mg, Zn, Co, Ni, Cu, or combinations thereof; and
a high dielectric inner material located within the outer material, the high dielectric inner material having a dielectric constant above 30, the low temperature fireable outer material and the high dielectric inner material being configured to be co-fired together at temperature between 650-900° C. without the use of adhesive or glue.

14. The composite material of claim 13 wherein the low temperature fireable outer material has a dielectric constant between 20 and 80.

15. A radio frequency circulator or isolator including the composite material of claim 13 .

16. The composite material of claim 13 wherein the low temperature fireable outer material and the high dielectric inner material are configured to be co-fired together at temperature without the use of adhesive or glue.

17. A method of forming a composite material for use as an isolator or circulator in a radiofrequency device, the method comprising:
providing a low temperature fireable outer material, the low fireable outer material having a garnet or scheelite structure and having the composition C 2 BiD 2 V 3 O 12 , C being Li, Na, K, or combinations thereof and D being Mg, Zn, Co, Ni, Cu, or combinations thereof;
entering a high dielectric inner material within an aperture in the low temperature fireable outer material, the high dielectric inner material having a dielectric constant above 30; and
co-firing the low temperature fireable outer material and the high dielectric inner material together at temperature between 650-900° C. to shrink the low temperature fireable outer material around an outer surface of the high dielectric inner material without the use of adhesive or glue.

18. The method of claim 17 wherein the low temperature fireable outer material has a dielectric constant between 20 and 80.

19. The method of claim 17 further comprising forming a radio frequency circulator or isolator including the composite material formed by the co-firing.

20. The method of claim 17 wherein the co-firing is performed without the use of adhesive or glue.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David
• Jiang Jianzhong
• Shunkwiler Jeffrey Alan
• Coats Neil Bruce
• Firor David Martin
• Cruickshank David Bowie

Classifications

• H10D84/08

  using combinations of technologies, e.g. using both Si and SiC technologies or using both Si and Group III-V technologies · CPC title

• H01P1/36 Primary

  Isolators · CPC title

• B32B18/00 Primary

  Layered products essentially comprising ceramics, e.g. refractory products · CPC title

• C04B35/265

  Compositions containing one or more ferrites of the group comprising manganese or zinc and one or more ferrites of the group comprising nickel, copper or cobalt · CPC title

• C04B35/2675

  Other ferrites containing rare earth metals, e.g. rare earth ferrite garnets · CPC title