Company Filing History:
Years Active: 2000-2001
Title: Hitoshi Kumatabara: Innovator in Dielectric Ceramics
Introduction
Hitoshi Kumatabara is a notable inventor based in Kagoshima-ken, Japan. He has made significant contributions to the field of dielectric ceramics, holding 2 patents that showcase his innovative approach to materials science.
Latest Patents
Kumatabara's latest patents include advancements in dielectric ceramics that comprise a diopside oxide crystal phase. These ceramics also incorporate at least one kind of crystal phase selected from the group consisting of a quartz crystal phase and a composite oxide crystal phase containing titanium and magnesium or zinc. The glass phase in these ceramics is limited to an amount not larger than 30% by weight. Notably, these dielectric ceramics exhibit a coefficient of thermal expansion of not smaller than 5.5 ppm/°C at room temperature to 400°C, along with a dielectric loss of not larger than 30×10 at 60 to 77 GHz. The ceramics can be produced by co-firing with low-resistance metals such as copper or silver, making them particularly useful for the production of wiring boards that handle high-frequency signals. The large coefficient of thermal expansion of these ceramics can be closely matched to that of semiconductor elements like GaAs or printed boards, effectively preventing breakage in the mounting portion of the wiring board due to thermal expansion differences.
Career Highlights
Kumatabara is currently employed at Kyocera Corporation, where he continues to develop innovative materials and technologies. His work has significantly impacted the field of electronics, particularly in the design and manufacturing of wiring boards.
Collaborations
Some of his notable coworkers include Yasuhide Tami and Masahiko Higashi, who have collaborated with him on various projects within the company.
Conclusion
Hitoshi Kumatabara's contributions to dielectric ceramics and his innovative patents reflect his expertise and dedication to advancing technology in the electronics industry. His work continues to influence the development of high-frequency wiring boards, showcasing the importance of material science in modern applications.