Low firing temperature dielectric materials designed to be co-fired with high bismuth garnet ferrites for miniaturized isolators and circulators

Patent metadata

Field	Value
Publication number	US-2019393579-A1
Application number	US-201916446877-A
Country	US
Kind code	A1
Filing date	Jun 20, 2019
Priority date	Jun 21, 2018
Publication date	Dec 26, 2019
Grant date	—

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, bismuth vanadate. 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 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. to form an integrated magnetic/dielectric assembly without the use of adhesive or glue.

2 . The composite material of claim 1 wherein the low temperature fireable outer material includes BiVO 4 .

3 . The composite material of claim 1 wherein the high dielectric inner material is shaped like a disc and the low temperature fireable outer material is shaped like a ring.

4 . The composite material of claim 1 wherein the low temperature fireable outer material includes a combination of BiVO 4 and Al 2 O 3 .

5 . The composite material of claim 4 wherein the low temperature fireable outer material has a dielectric constant between 20 and 80.

6 . The composite material of claim 4 wherein the Al 2 O 3 is present in the low temperature fireable outer material an amount up to about 6 wt %.

7 . The composite material of claim 4 wherein Bi 4 V 2 O 11 is present in the low temperature fireable outer material as a phase separate from the BiVO 4 .

8 . The composite material of claim 4 wherein the low temperature fireable outer material further includes one or more of yttrium vanadate, gadolinium vanadate, or titanium oxide.

9 . The composite material of claim 8 wherein the titanium oxide is present in the low temperature fireable outer material in an amount up to 10 wt %.

10 . The composite material of claim 8 wherein one or both of yttrium vanadate, gadolinium vanadate form a solid solution with the BiVO 4 in the low temperature fireable outer material.

11 . The composite material of claim 8 wherein the titanium dioxide is present in the low temperature fireable outer material as a phase separate from the BiVO 4 .

12 . The composite material of claim 8 wherein the gadolinium vanadate is present in the low temperature fireable outer material in an amount up to 50 wt %.

13 . The composite material of claim 8 wherein Bi 4 V 2 O 11 and BiVO 4 are present in the low temperature fireable outer material as separate phases.

14 . The composite material of claim 13 wherein Bi 4 V 2 O 11 , BiVO 4 , and Bi 2 Ti 4 O 11 are present in the low temperature fireable outer material as separate phases.

15 . The composite material of claim 14 wherein Bi 4 V 2 O 11 , BiVO 4 , Bi 2 Ti 4 O 11 , and TiO 2 are present in the low temperature fireable outer material as separate phases.

16 . The composite material of claim 8 wherein Bi 4 V 2 O 11 and GdVO 4 are present in the low temperature fireable outer material as separate phases.

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; 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 lower 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 to form an integrated magnetic/dielectric assembly without the use of adhesive or glue.

18 . The method of claim 17 wherein one of the low temperature fireable outer material includes BiVO 4 , the low temperature fireable outer material includes a combination of BiVO 4 and Al 2 O 3 , the Al 2 O 3 is present in the low temperature fireable outer material an amount up to about 6 wt %, Bi 4 V 2 O 11 is present in the low temperature fireable outer material as a phase separate from the BiVO 4 , the low temperature fireable outer material further includes one or more of yttrium vanadate, gadolinium vanadate, or titanium oxide, the titanium oxide is present in the low temperature fireable outer material in an amount up to 10 wt %, one or both of yttrium vanadate, gadolinium vanadate form a solid solution with the BiVO 4 in the low temperature fireable outer material, the titanium dioxide is present in the low temperature fireable outer material as a phase separate from the BiVO 4 , the gadolinium vanadate is present in the low temperature fireable outer material in an amount up to 50 wt %, Bi 4 V 2 O 11 and BiVO 4 are present in the low temperature fireable outer material as separate phases, Bi 4 V 2 O 11 , BiVO 4 , and Bi 2 Ti 4 O 11 are present in the low temperature fireable outer material as separate phases, Bi 4 V 2 O 11 , BiVO 4 , Bi 2 Ti 4 O 11 , and TiO 2 are present in the low temperature fireable outer material as separate phases, or Bi 4 V 2 O 11 and GdVO 4 are present in the low temperature fireable outer material as separate phases.

19 . A radiofrequency isolator or circulator comprising:
a low temperature fireable outer material, the low temperature fireable outer material having a garnet or scheelite structure; 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.

20 . The radiofrequency isolator or circulator of claim 19 wherein the low temperature fireable outer material has a composition as recited in any of claim 2 , 4 , or 6 - 16 .

21 . The radiofrequency isolator or circulator of claim 19 included in an electronics device module.

22 . The radiofrequency isolator or circulator of claim 19 included in an RF electronics device.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David
• Cruickshank David Bowie
• Shunkwiler Jeffrey Alan
• Jiang John Jianzhong
• Firor David Martin
• Polisetty Srinivas

Classifications

• H01P11/00 Primary

  Apparatus or processes specially adapted for manufacturing waveguides or resonators, lines, or other devices of the waveguide type · CPC title

• H01F1/346

  [(TO4) 3] with T= Si, Al, Fe, Ga (H01F10/24 takes precedence; Faraday rotators G02F1/09) · CPC title

• H01P1/387

  Strip line circulators · CPC title

• C01G23/047

  Titanium dioxide · CPC title

• C01P2002/52

  containing elements as dopants · CPC title