Indium containing magnetic garnet materials

Patent metadata

Field	Value
Publication number	US-2018330854-A1
Application number	US-201815972617-A
Country	US
Kind code	A1
Filing date	May 7, 2018
Priority date	May 10, 2017
Publication date	Nov 15, 2018
Grant date	—

Abstract

Disclosed are embodiments of synthetic garnet materials for use in radiofrequency applications. In some embodiments, increased amounts of gadolinium can be added into specific sites in the crystal structure of the synthetic garnet by incorporating indium, a trivalent element. By including both indium and increased amounts of gadolinium, the dielectric constant can be improved. Thus, embodiments of the disclosed material can be advantageous in both above and below resonance applications, such as for isolators and circulators.

First claim

What is claimed is:

1 . A synthetic garnet material comprising a structure including bismuth, gadolinium, iron, and indium, the synthetic garnet material having a dielectric constant value of at least 35.

2 . The synthetic garnet material of claim 1 wherein the synthetic garnet material has the chemical formula Bi x Ca s+y Gd z Y 3-s-x-y-z Fe 5-r-y In r Hf s Zr y O 12 , 0<x≤2.5, 0≤y≤1.0, 0≤s≤1.0, 0<r≤1.0, and 0<z≤1.0.

3 . The synthetic garnet material of claim 2 wherein 1.0≤x≤2.0, 0.3≤r≤0.7, 0.2≤s+y≤0.7, and 0<z≤1.0.

4 . The synthetic garnet material of claim 2 wherein s=0 and y=0.

5 . The synthetic garnet material of claim 1 wherein the synthetic garnet material has a composition of Bi 1.68 Gd 1.32 In 0.8 Fe 4.18 O 11.97 , Bi 1.68 Gd 1.11 Ca 0.21 In 0.39 Zr 0.21 Fe 4.38 O 11.97 , Bi 1.68 Gd 1.08 Ca 0.24 In 0.36 Zr 0.24 Fe 4.38 O 11.97 , Bi 1.68 Gd 1.05 Ca 0.27 In 0.33 Zr 0.27 Fe 4.38 O 11.97 , or Bi 1.68 Gd 1.02 Ca 0.3 In 0.3 Zr 0.3 Fe 4.38 O 11.97 .

6 . The synthetic garnet material of claim 1 wherein the synthetic garnet material has the chemical formula Bi 1-x Gd x Fe 5-y In y O 1 , 0<x<2.0, 0<y<1.0.

7 . The synthetic garnet material of claim 1 wherein the synthetic garnet material does not include calcium or zirconium.

8 . The synthetic garnet material of claim 1 wherein the synthetic garnet material has a dielectric constant of at least 40.

9 . The synthetic garnet material of claim 1 wherein the synthetic garnet material has a dielectric loss below 0.00250.

10 . A method of manufacturing a synthetic garnet material having a dielectric constant of at least 35, the method comprising:
blending a raw material including oxides and/or carbonites; and calcining the blended materials to form a synthetic garnet material having a crystal structure including bismuth, gadolinium, iron, and indium and having a dielectric constant of at least 35.

11 . The method of claim 10 further comprising forming an isolator or circulator from the synthetic garnet material.

12 . The method of claim 10 wherein the synthetic garnet material has a dielectric constant of at least 40.

13 . The method of claim 10 wherein the synthetic garnet material has the chemical formula Bi x Ca s+y Gd z Y 3-s-x-y-z Fe 5-r-s-y In r Hf s Zr y O 12 , 0<x≤2.5, 0≤y≤1.0, 0≤s≤1.0, 0<r≤1.0, and 0<z≤1.0.

14 . The method of claim 13 wherein 1.0≤x≤2.0, 0.3≤r≤0.7, 0.2≤s+y≤0.7, and 0<z≤1.0.

15 . A radiofrequency device comprising:
a synthetic garnet material including a structure including bismuth, gadolinium, iron, and indium, the synthetic garnet material having a dielectric constant value of at least 35.

16 . The radiofrequency device of claim 15 wherein the radiofrequency device is incorporated into an antenna.

17 . The radiofrequency device of claim 15 wherein the radiofrequency device is an isolator or circulator.

18 . The radiofrequency device of claim 15 wherein the synthetic garnet material has the chemical formula Bi x Ca s+y Gd z Y 3-s-x-y-z Fe 5-r-s-y In r Hf s Zr y O 12 , 0<x≤2.5, 0≤y≤1.0, 0≤s≤1.0, 0<r≤1.0, and 0<z≤1.0.

19 . The radiofrequency device of claim 18 wherein 1.0≤x≤2.0, 0.3≤r≤0.7, 0.2≤s+y≤0.7, and 0<z≤1.0.

20 . The radiofrequency device of claim 15 wherein the synthetic garnet material has a dielectric constant of at least 40.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David
• Cruickshank David Bowie

Classifications

• H01F1/10 Primary

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

• H01P1/36

  Isolators · CPC title

• C01G49/0036

  containing one alkaline earth metal, magnesium or lead · CPC title

• C01G49/0054 Primary

  containing one rare earth metal, yttrium or scandium · CPC title

• C01G49/0063

  containing zinc · CPC title