Ceramic ferroelectric material

US5312790A · kind A · utility

Assignee

• The United States of America as represented by the Secretary of the Army · US

Inventors

• Louise Sengupta · Ellicott City, US
• Eric Ngo · Watertown, US
• Steven Stowell · Columbia, US
• Gary A. Gilde · North East, US
• Robert Lancto · Wakefield, US

Key dates

• Filing date: Jun 9, 1993
• Grant date: May 17, 1994
• Expiry date: Jun 9, 2013

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01Q1/38
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

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.