Localized temperature stability in Low Temperature Cofired Ceramics (LTCC).

Dai, Steven Xunhu ; Hsieh, Lung-Hwa.

关键词: CERAMICS;    COMPATIBILITY;    DIELECTRIC MATERIALS;    PERMITTIVITY;    RESONATORS;    STABILITY;    TEMPERATURE COEFFICIENT;    THICKNESS;    TITANATES;   

DOI  :  10.2172/1049476
RP-ID  :  SAND2012-3006
PID  :  OSTI ID: 1049476
Others  :  TRN: US201218%%563

学科分类：材料科学（综合）

美国|英语

来源: SciTech Connect

【 摘 要 】

The base dielectrics of commercial low temperature cofired ceramics (LTCC) systems have a temperature coefficient of resonant frequency ({tau}{sub f}) in the range -50 {approx} -80 ppm/C. In this research we explored a method to realize zero or near zero {tau}{sub f} resonators by incorporating {tau}{sub f} compensating materials locally into a multilayer LTCC structure. To select composition for {tau}{sub f} adjustment, {tau}{sub f} compensating materials with different amount of titanates were formulated, synthesized, and characterized. Chemical interactions and physical compatibility between the {tau}{sub f} modifiers and the host LTCC dielectrics were investigated. Studies on stripline (SL) resonator panels with multiple compensating dielectrics revealed that: 1) compositions using SrTiO{sub 3} provide the largest {tau}{sub f} adjustment among titanates, 2) the {tau}{sub f} compensation is proportional to the amount of SrTiO{sub 3} in compensating materials, as well as the thickness of the compensating layer, and 3) the most effective {tau}{sub f} compensation is achieved when the compensating dielectric is integrated next to the SL. Using the effective dielectric constant of a heterogeneous layered dielectric structure, results from Method of Momentum (MoM) electromagnetic simulations are consistent with the experimental observations.