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Localized Temperature Stability in LTCC
Keywords: temperature coefficient of resonant frequency, LTCC, localized temperature stability
Low temperature cofired ceramic (LTCC) is a multilayer 3D packaging, interconnection and integration technology. One of the advantages of LTCC is the ability to integrate passive components via cofiring processes. For LTCC modules with embedded resonator functions targeting radio frequency (RF) applications, the temperature coefficient of resonant frequency (Tf) is a critical parameter. The base dielectrics of commercial LTCC systems have a Tf in the range -50 ~ -80 ppm/°C. In this study we explored a method to realize zero or near zero Tf resonators by incorporating Tf compensating materials locally into a multilayer LTCC structure. Chemical interactions and physical compatibility between the Tf modifiers and the host LTCC dielectrics were investigated. A stripline ring resonator with near zero Tf was demonstrated in a non-zero Tf multilayer LTCC structure. *Sandia National Laboratories is a multi-program laboratory managed and operated by Sandia Corporation, a wholly owned subsidiary of Lockheed Martin Corporation, for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-AC04-94AL85000.
Steve Dai, Member of Technical Staff
Sandia National Laboratories
Albuquerque, NM

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