Ceramic ferroelectric material
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsLouise C. Sengupta, Eric Ngo, Steven Stowell, Gary Gilde, Robert Lancto
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Abstract
A novel ceramic ferroelectric material having a low dielectric constant, 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 Ba.sub.1-x Sr.sub.x TiO.sub.3 -Al.sub.2 O.sub.3, wherein x is greater than 0.00, but less than or equal to 0.70, and wherein the percent weight ratio between Ba.sub.1-x Sr.sub.x TiO.sub.3 and Al.sub.2 O.sub.3 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.
Claims4
A ceramic ferroelectric composite material consisting essentially of
- Barium Strontium Titanate, said Barium Strontium Titanate represented as Ba.sub.1-x Sr.sub.x TiO.sub.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.
Dependencies are inferred from the claim text.