Accession Number : ADA297283

Title :   Thick Film Fabrication of Ferroelectric Phase Shifter Materials.

Corporate Author : ARMY RESEARCH LAB WATERTOWN MA MATERIALS DIRECTORATE

Personal Author(s) : Sengupta, L. C. ; Stowell, S. ; Ngo, E. ; Molongoski, M. E.

PDF Url : ADA297283

Report Date : MAY 1995

Pagination or Media Count : 16

Abstract : Various composites of BSTO combined with other non-electrically active oxide ceramics have been formulated. In general, the composites have adjustable electronic properties which can be tailored for use in phased array antennas and other phase shifting devices. The dielectric constant and the loss tangents have been reduced to enhance the overall impedance matching and thereby lowering the insertion toss of the device. In addition, the overall tunability, the change in the dielectric constant with applied voltage, is maintained at a sufficiently high level. The thickness limitation of the bulk materials is around 34 mils which can be used up to approximately 15 GHz. In order to increase the operating frequencies of the phase shifters, thick films were fabricated using non-aqueous tape-casting. The tapes were electrically characterized and compared to bulk ceramics. Also, laminated stacks with alternating layers of high dielectric constant and low dielectric constant were fabricated. (MM)

Descriptors :   *COMPOSITE MATERIALS, *CERAMIC MATERIALS, *FERROELECTRIC MATERIALS, *THICK FILMS, LAMINATES, ELECTROMAGNETIC PROPERTIES, FABRICATION, VOLTAGE, BULK MATERIALS, DIELECTRIC PROPERTIES, TIN, BARIUM TITANATES, ANTENNA ARRAYS, PHASED ARRAYS, PHASE SHIFT, IMPEDANCE MATCHING, PHASE SHIFT CIRCUITS, FERROELECTRICITY, STRONTIUM ALLOYS.

Subject Categories : Electrical and Electronic Equipment
      Ceramics, Refractories and Glass
      Laminates and Composite Materials
      Electricity and Magnetism

Distribution Statement : APPROVED FOR PUBLIC RELEASE