US5486491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic ferroelectric composite material - BSTO-ZrO2
Assignee: United States Department of the Army
•
Filing: 1994-03-07
•
Granted: 1996-01-23
•
Expires: 2014-03-07
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-ZrO2, 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 ZrO2 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 Sengupta
- 👤 Eric Ngo
- 👤 Steven Stowell
- 👤 Michelina O'Day
- 👤 Robert Lancto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:17
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
93 words
A sintered ceramic ferrolectric composite material for use in array antennas and the like, 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 Zirconia; wherein said Barium Strontium Titanate and Zirconia are present in an amount sufficient to provide a composite having a dielectric constant of about 60 to 3800, low loss tangent of the range of 0.03 or less, and a high tunability. of about 1.67 to 46%.
Claim 2
Dependent Claim
93 words
A sintered ceramic ferrolectric composite material for use in array antennas and the like, 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 Zirconia; wherein said Barium Strontium Titanate and Zirconia are present in an amount sufficient to provide a composite having a dielectric constant of about 60 to 3800, low loss tangent of the range of 0.03 or less, and a high tunability. of about 1.67 to 46%.
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 Zirconia ranges from approximately 99%-40% Barium Strontium Titanate to approximately 1%-60% Zirconia.
Claim 5
Dependent Claim
29 words
The ceramic ferroelectric composite material of claim 3, wherein the ratio of Barium Strontium Titanate to Zirconia is approximately 70% wt. Barium Strontium Titanate to approximately 30% wt. Zirconia.
References Cited (Backward Citations)
US4987108A
Cited
JPH03109261A
Cited
JPH03224109A
Cited
US5232880A
Cited
US5290740A
Cited
JPH05254928A
Cited
US5319517A
Cited
JPH05330910A
Cited
EP0581251A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-01-22 | 1999-07-24 | 2000-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-01-22 | 2003-07-24 | 2004-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-01-22 | 2007-07-24 | 2008-01-23 | $7700.00 | Window Closed / Lapsed |