US5312790A
Expired / Lapsed
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Ceramic ferroelectric material
Assignee: United States Department of the Army
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Filing: 1993-06-09
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Granted: 1994-05-17
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Expires: 2013-06-09
Abstract
Abstract A novel ceramic ferroelectric material having a low dielectric constant, low loss and high tunability. The material is a composite comprising Barium Strontium Titanate (BSTO) and a ceramic material having a low dielectric constant. The preferred composite is represented by Ba1-xSrxTiO3-Al2O3, wherein x is greater than 0.00, but less than or equal to 0.70, and wherein the percent weight ratio between Ba1-xSrxTiO3 and Al2O3 ranges from approximately 99%-40% and 1%-60%, respectively. The novel materials possess superior electronic properties; and they may be employed in various antenna systems.
Inventors
- 👤 Louise C. Sengupta
- 👤 Eric Ngo
- 👤 Steven Stowell
- 👤 Gary Gilde
- 👤 Robert Lancto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; H; H01; H01Q; H01Q3/00; H01Q3/26; H01Q3/30; H01Q3/34; H01Q3/36; C04B35/10; C04B35/111; C04B35/117; C04B35/462; C04B35/465; C04B35/48; C04B35/49; H01Q1/00; H01Q1/36; H01Q1/38
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
65 words
A ceramic ferroelectric composite material consisting essentially of Barium Strontium Titanate, said Barium Strontium Titanate represented as Ba 1-x Sr x TiO 3 , wherein x is greater than 0.0 but less than or equal to 0.70; and alumina; wherein said Barium Strontium Titanate and alumina are present in amounts to provide a composite having a low dielectric constant, low loss tangent and high tunability.
Claim 2
Dependent Claim
65 words
A ceramic ferroelectric composite material consisting essentially of Barium Strontium Titanate, said Barium Strontium Titanate represented as Ba 1-x Sr x TiO 3 , wherein x is greater than 0.0 but less than or equal to 0.70; and alumina; wherein said Barium Strontium Titanate and alumina are present in amounts to provide a composite having a low dielectric constant, low loss tangent and high tunability.
Claim 3
Dependent Claim
25 words
The ceramic ferroelectric composite material of claim 1, wherein said Barium Strontium Titanate is Ba 1-x Sr x TiO 3 , wherein x=0.35 to 0.40.
Claim 4
Dependent Claim
30 words
The ceramic ferroelectric composite material of claim 2, wherein the weight ratio of said Barium Strontium Titanate to alumina ranges from approximately 99%-40% Barium Strontium Titanate to approximately 1%-60% alumina.
Claim 5
Dependent Claim
29 words
The ceramic ferroelectric composite material of claim 3, wherein the ratio of Barium Strontium Titanate to alumina is approximately 70% wt. Barium Strontium Titanate to approximately 30% wt. alumina.
References Cited (Backward Citations)
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