High q modified barium magnesium tantalate for high frequency applications

Patent metadata

Field	Value
Publication number	US-2017341950-A1
Application number	US-201715608170-A
Country	US
Kind code	A1
Filing date	May 30, 2017
Priority date	May 31, 2016
Publication date	Nov 30, 2017
Grant date	—

Abstract

Disclosed are embodiments of a barium magnesium tantalate including additional components to increase the Q value of the material. In some embodiments, complex tungsten oxides and/or hexagonal perovskite crystal structures can be added into the barium magnesium tantalate to provide for advantageous properties. In some embodiments, no tin is used in the formation of the material.

First claim

What is claimed is:

1 . A high Q ceramic material comprising:
barium magnesium tantalate; and one of a complex tungsten oxide compound, a hexagonal perovskite crystal structure, or a double perovskite crystal structure incorporated into the barium magnesium tantalate to form a composite material having a high Q value of greater than 12000 at about 10 GHz.

2 . The high Q ceramic material of claim 1 wherein the high Q ceramic material does not include tin.

3 . The high Q ceramic material of claim 1 wherein the complex tungsten oxide is incorporated into the barium magnesium tantalate.

4 . The high Q ceramic material of claim 3 wherein between 3 wt. % and 5 wt. % of the complex tungsten oxide is incorporated into the barium magnesium tantalate.

5 . The high Q ceramic material of claim 4 further including MgTa 2 O 6 incorporated into the barium magnesium tantalate.

6 . The high Q ceramic material of claim 1 wherein the complex tungsten oxide compound, the hexagonal perovskite crystal structure, or the double perovskite crystal structure is selected from the group consisting of Ba 2 MgWO 6 , Ba 8 LiTasWO 24 , Ba 8 LiTasWO 24 , Ba 2 MgWO 6 , Ba 3 LaTa 3 O 12 , Ba 8 LiTasWO 24 , BaLaLiWO 6 , Ba 4 Ta 2 WO 12 , Ba 2 La 2 MgW 2 O 12 , BaLaLiWO 6 , Sr 3 LaTa 3 O 12 , and SrLaTaO 12 .

7 . The high Q ceramic material of claim 1 wherein the hexagonal perovskite crystal structure is incorporated into the barium magnesium tantalate.

8 . The high Q ceramic material of claim 7 wherein about 5 wt. % of the hexagonal perovskite crystal structure is incorporated into the barium magnesium tantalate.

9 . The high Q ceramic material of claim 8 further including MgTa 2 O 6 incorporated into the barium magnesium tantalate.

10 . The high Q ceramic material of claim 1 wherein the composite material contains at least 95% barium magnesium tantalate.

11 . The high Q ceramic material of claim 1 wherein the composite material contains at least 97% barium magnesium tantalate.

12 . The high Q ceramic material of claim 1 wherein the composite material has a dielectric constant of at least 25.

13 . The high Q ceramic material of claim 1 wherein the composite material has a Q value of greater than 17000 at about 10 GHz.

14 . The high Q ceramic material of claim 1 wherein the composite material includes 95 wt. % Ba 3 MgTa 2 O 9 +5 wt. % Ba 4 Ta 2 WO 12 +0.2 weight % MgTa 2 O 6 or 95 wt. % Ba 3 MgTa 2 O 9 +5 wt. % Ba 4 Ta 2 WO 12 +0.5 weight % MgTa 2 O 6 .

15 . A cellular base station including the high Q ceramic material of claim 1 .

16 . A millimeter wave filter including the high Q ceramic material of claim 1 .

17 . A collision avoidance system including the high Q ceramic material of claim 1 .

18 . A method of making a high Q ceramic material comprising:
providing barium magnesium tantalate; and incorporating one of a complex tungsten oxide compound, a hexagonal perovskite crystal structure, or a double hexagonal perovskite crystal structure into the barium magnesium tantalate to form a solid solution having a high Q value of greater than 12000 at about 10 GHz.

19 . A dielectric resonator or isolator for applications above 10 GHz, the dielectric resonator comprising:
barium magnesium tantalate; and one of a complex tungsten oxide compound. a hexagonal perovskite crystal structure, or a double hexagonal perovskite crystal structure incorporated into the barium magnesium tantalate to form a composite material having a high Q value of greater than 12000 at 10 GHz.

20 . The dielectric resonator or isolator of claim 19 wherein the dielectric resonator is configured to be used at frequencies of about 10 GHz and above.

Assignees

• Skyworks Solutions Inc

Inventors

• Hill Michael David

Classifications

• C04B2235/80

  Phases present in the sintered or melt-cast ceramic products other than the main phase · CPC title

• C04B2235/77

  Density · CPC title

• C01G35/006 Primary

  Compounds containing tantalum, with or without oxygen or hydrogen, and containing two or more other elements · CPC title

• C04B35/495

  based on vanadium, niobium, tantalum, molybdenum or tungsten oxides or solid solutions thereof with other oxides, e.g. vanadates, niobates, tantalates, molybdates or tungstates · CPC title

• H01B3/12

  ceramics · CPC title