Oliver Dernovsek

LTCC glass-ceramic composites for microwave application

Advanced materials of rare earth derived glass and reactive bonded glass-ceramic composites are exceptionally interesting for 1C packaging, radar, antennas and wireless technologies for the next generation of miniature electronic devices. Glass ceramic composites in the system 1:1:4 BaO-Nd 2 O 3 -TiO 2 and modified rare earth glasses based on boron oxide for passive integration in LTCC demonstrate excellent dielectric properties in the middle permittivity F range of 20/70 with high quality factor Q and low temperature coefficient TCf at microwave frequencies. Depending on the glass-ceramic system, concentration, significant processing parameters e.g. powder preparation techniques and sintering of dense composite at temperatures < 900 C were achieved. Dielectric properties were studied by a cavity resonator method at frequencies 1-6 GHz in correlation of the crystalline microstructure. This work was supported by tridimensional modeling systems to estimate dielectric behavior of multiphase glass ceramic composites.