Premium
Electric‐Field‐Controlled Permittivity Ferroelectric Composition for Microwave LTCC Modules
Author(s) -
Hu Tao,
Jantunen Heli,
Deleniv Anatoli,
Leppävuori Seppo,
Gevorgian Spartak
Publication year - 2004
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2004.00578.x
Subject(s) - materials science , permittivity , ferroelectricity , sintering , microwave , tape casting , microstructure , ceramic , dissipation factor , relative permittivity , electric field , composite material , ferroelectric ceramics , dissipation , dielectric , optoelectronics , telecommunications , physics , quantum mechanics , computer science , thermodynamics
A low‐temperature cofired ferroelectric ceramic composition for electrically tunable radio frequency devices is introduced. A sintering temperature of 950°C for BaSrTiO 3 –MgO was obtained following the combined addition of B 2 O 3 and Li 2 CO 3 . The effects of these sintering aids on densification, microstructure, and ferroelectric properties were investigated. The permittivity and dissipation factor values were 234 and 0.0010, respectively, measured at 286.3 K, 1 kHz. The electrically tunable ferroelectric structure for microwave measurement was fabricated throughout the tape‐casting process. Measured permittivity was 130 at 26 GHz and tunability >15% (4 V/μm).