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Temperature‐Compensated Bandpass Filters in Low Temperature Co‐Fired Ceramic
Author(s) -
Dai Steve,
Hsieh LungHwa
Publication year - 2013
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.12196
Subject(s) - materials science , stripline , band pass filter , dielectric , ceramic , temperature coefficient , atmospheric temperature range , optoelectronics , electronic engineering , composite material , engineering , physics , meteorology
For low temperature co‐fired ceramic ( LTCC ) modules targeting radio frequency applications, a near 0 ppm/°C temperature coefficient of resonant frequency (τ f ) ensures temperature stability of embedded filters. The base dielectrics of most commercial LTCC systems have a τ f in the range −50 to −80 ppm/°C. By integrating co‐fireable compensating dielectrics with an opposite τ f to that of the host dielectric, we demonstrated multilayer stripline ( SL ) bandpass filters with a τ f approaching 0 ppm/°C using D u P ont 951 LTCC . The effective dielectric constant of the SL in multilayer LTCC with dissimilar layered dielectrics was calculated using a variational method with transmission‐line technique.