Abstract: A novel ceramic ferrite/ferroelectric composite material having a low dissipation factor, voltage tunability, and proper impedance matching for the incident medium. The material comprises ferrites doped with the ferroelectric Barium Strontium Titanate (BSTO) or ferrites doped with the ferroelectric Barium Strontium Titanate (BSTO)/MgO. Preferred composites are magnesium ferrites doped with BSTO and magnesium ferrites doped with BSTO/MgO. Most particularly, the inventive composites are comprised of magnesium ferrites doped with Ba.sub.1-x Sr.sub.x TiO.sub.3 and magnesium ferrites doped with Ba.sub.1-x Sr.sub.x TiO.sub.3 /MgO, wherein x is greater than 0.00, but less than or equal to 0.75, and wherein the percent weight ratio of magnesium ferrite to BSTO or BSTO/MgO is 60 to 95 percent ferrite to 40 to 5 percent BSTO or 60 to 95 percent ferrite to 40 to 5 percent BSTO/MgO ferroelectric. A particularly well suited composite, i.e., one having a .mu./.di-elect cons.

Abstract: A laminated ceramic ferroelectric material has adjacent layers of Barium ontium Titanate (BSTO)--oxide composite stacked in order of descending oxide content and sized in thickness to produce a generally equal capacitance across each layer, resulting in a material having a graded dielectric constant for use in phased array antenna, for example. The oxides are from the metallic oxide group consisting of alumina, zirconia and magnesia and the layers are produced by tape casting.

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.