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LTCC – The Future of Ceramic Packaging

LTCC – The Future of Ceramic Packaging. NEW APPLICATIONS. Bluetooth - 2.45 GHz Handsets - 1 to 2 GHz Optical transceivers - 40GHz+ Sensors - 20 to 76 GHz Satellite comms - 20 to 40 GHz Automotive wireless Radar systems - 10 GHz +. High Circuit Density

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LTCC – The Future of Ceramic Packaging

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  1. LTCC – The Future of Ceramic Packaging NEW APPLICATIONS • Bluetooth - 2.45 GHz • Handsets - 1 to 2 GHz • Optical transceivers - 40GHz+ • Sensors - 20 to 76 GHz • Satellite comms - 20 to 40 GHz • Automotive wireless • Radar systems - 10 GHz +

  2. High Circuit Density • High Conductivity Metallization • Reliability and Lower Cost • 3-D Design • Low Dielectric Constant • Passive Integration • Size Reduction • Design Flexibility Why LTCC ? “Motorola Satellite Series Integrated Receiver Low Noise Amplifier” selected for cover photo of 1999 special issue, devoted to LTCC, of the IMAPS (International Microelectronics & Packaging Society) magazine

  3. Bluetooth – Technology Driver Connecting Cell Phones to Computers Bluetooth Transceivers – Need to be Extremely Small, and Exceedingly Inexpensive RF Integrated LTCC Modules High- frequency Performance Circuit Integration Superior Thermal Performance Hermeticity High reliability Low-Cost

  4. Co-sintering Issues • Chemical and physical interactions between the components • could reduce performance • Sintering stresses that could cause defects • To measure thermo-mechanical response of LTCC and Ag systems • by isothermal cyclic loading dilatometry (ICLD) • To evaluate thermo-mechanical, physical and chemical • incompatibility of LTCC/Ag systems Research Objectives

  5. 1cm 1cm . . Equation for Camber Rate based on Viscous Model : . . æ ö - u h C M æ ö 6 dM 1 ç ÷ » - D e ç ÷ K ç ÷ - u h 2 M C . è DC ø 1 è ø • where K = curvature rate, the viscous Poisson’s ratio, • the uniaxial viscosities,  the sintering rate differential, dM and DC are thicknesses of metal and ceramic layers . (Ref : Jean et al., J. Mater.Res., Vol. 12, No.10, Oct 1997) Shrinkage % Temperature (°C) Effect of mismatched sintering kinetics on camber Ag/LTCC Bilayer

  6. h Y stress time t2 t1 Elastic E<<h Viscoelastic Viscous E>>h Strain loading zone t1 t2 t1 t2 t1 t2 Strain Rate Mechanical response by Cyclic Loading Dilatometry The viscosity of a porous sintering compact can be determined by cyclic loading dilatometry  = f (,T) Thermo Mechanical Analyzer

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