Breakthrough advances in low loss, tunable dielectric materials

摘要

Low loss. tunable dielectric materials are im- portant for phased array antenna and other device appli- cations. Various composites of barium strontium titani- um oxide (BSTO) combined with other nonelectrically active oxide ceramics have been formulated for such us- es. The dielectric constant and the loss tangents of these composites have been reduced to enhance the overall im- pedance matching and thereby lowering the overall in sertion loss of the device. The material has been fabricat ed in bulk ceramic, thick film, and thin film form to ad- dress a broad range of frequency applications. The mate- rial fabrication methods and the electronic properties of these composites will be discussed in this article.