Yasuyuki Baba

Co-fireable copper multilayered ceramic substrates

The authors discuss the manufacture of co-fireable copper multilayered ceramic substrates utilizing green-tape technology. The substrates were manufactured using an oxidation-reduction reaction, employing CuO paste as an inner-layer conductor. Two types of substrate materials were developed, a crystallizable glass that has good flexural strength, and an amorphous glass which has a low dielectric constant. The burnout process is performed in air. The reduction process is carried out in a nitrogen atmosphere containing 10% hydrogen in which copper oxide is reduced into copper, and sintering is performed in the nitrogen. Low impedance, migration resistance, and low cost have resulted from the use of a Cu conductor.<<ETX>>

High reliability internal capacitor of LTCC

The authors discuss the internal capacitor of a low-temperature ceramic circuit (LTCC). They include the material study, manufacturing process, electronic properties, and reliability of the internal capacitor. After this study, a highly reliable internal capacitor is developed and this result makes this technology closer to real application. >