Location History:
- Egawa, JP (1990)
- Osaka, JP (1991)
- Toyonaka, JP (2001)
Company Filing History:
2 out of 26 
1 out of 240 Years Active: 1990-2001
Title: Keisuke Kageyama: Innovator in Microwave Dielectric Ceramics
Introduction
Keisuke Kageyama is a notable inventor based in Egawa, Japan. He has made significant contributions to the field of microwave dielectric ceramics, holding a total of 3 patents. His work focuses on enhancing the performance of electronic devices through innovative ceramic compositions.
Latest Patents
One of Kageyama's latest patents is a microwave dielectric ceramic composition. This composition exhibits excellent relative permittivity and high Qf-value, allowing for easy adjustment of the temperature coefficient of resonance frequency. It is particularly suited for filters with cavities made of materials such as iron or copper, which have a large temperature coefficient of resonance frequency. The ceramic is of a BaO–TiO2–Nd2O3–Sm2O3 type, where Nd2O3 is partly substituted by Bi2O3, and Nd2O3 is partly substituted by Ln2O3 (where Ln is La, Ce, or Pr). Additionally, the substituted Ln2O3 is partly substituted by Eu2O3 to improve properties, achieving a relative permittivity of 82.5 to 92.5, Qf values ranging from 6000 to 7300 GHz, and a temperature coefficient of frequency of 10-20 ppm/°C. This innovation allows for favorable electric characteristics in resonance cavities of various materials and sizes.
Another significant patent is a dielectric ceramic composition designed for use in electronic devices. This composition is crucial for advancing the capabilities of modern electronic applications.
Career Highlights
Throughout his career, Kageyama has worked with prominent companies, including Sumitomo Special Metal Co. Ltd. and Sumitomo Special Metals Co., Ltd. His experience in these organizations has contributed to his expertise in the field of dielectric ceramics.
Collaborations
Kageyama has collaborated with notable colleagues such as Takeshi Shimada and Soyoko Ando. These partnerships have further enriched his research and development efforts in microwave dielectric ceramics.
Conclusion
Keisuke Kageyama's innovative work in microwave dielectric ceramics has made a significant impact on the field of electronic devices. His patents reflect a commitment to advancing technology and improving the performance of electronic components.