Ceramic ferroelectric composite material - BSTO-ZrO.sub.2
AssigneeThe United States of America as represented by the Secretary of the Army
InventorsLouise Sengupta, Eric Ngo, Steven Stowell, Michelina O'Day, 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 --ZrO.sub.2, 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 ZrO.sub.2 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 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.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
- 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%.
Dependencies are inferred from the claim text.