Kojima Takafumi

コジマタカフミ | Kojima Takafumi

Affiliation and department：
Job title： Associate Professor

Research field (3)： Applied physics - general , Electronic devices and equipment , Astronomy

Research keywords (6)： Radio Astoronomy , Wideband , Terahertz , Microwave , Low noise , Superconductor

Research theme for competitive and other funds (12)：

2022 - 2027 Realization of innovative non-reciprocal integrated-circuit devices using SIS mixers
2022 - 2027 Galaxy Formation in the Pre-Reionization Era Explored by Far-Infrared Nebular Emission Lines
2022 - 2027 Exploration of the pre-reionization era with spectroscopy of the far-infrared oxygen emission line
2020 - 2025 Search for Missing Black Holes in the Galaxy based on Submillimeter-wave Observations
2018 - 2023 サブミリ/THz多輝線観測によるLIRGs衝突の星形成・AGNと高密度ガスの物理

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Papers (68)：

Haoran Kang, Takafumi Kojima, Takeshi Sakai, Yoichi Tamura, Airi Tetsuka, Sho Masui, Tatsuya Takekoshi. Development Status of Wideband Millimeter-Wave Receivers for LMT-FINER. Proceedings of SPIE - The International Society for Optical Engineering. 2024. 13102
Taku Nakajima, Kazuji Suzuki, Takafumi Kojima, Yoshinori Uzawa, Masayuki Ishino, Issei Watanabe. Propagation in Superconducting Niobium Rectangular Waveguide in the 100 GHz band. Journal of Physics: Conference Series. 2023. 2545. 012021. 1-7
Satoshi Ono, Tsuyoshi Narita, Sho Masui, Takafumi Kojima, Takeshi Sakai. Design and fabrication of stripline type of a broadband quadrature hybrid couplers with transitions of coaxial-microstrip-stripline. 2022 Asia-Pacific Microwave Conference (APMC). 2022
Yoshinori Uzawa, Matthias Kroug, Takafumi Kojima, Masanori Takeda, Kazumasa Makise, Shohei Ezaki, Wenlei Shan, Akihira Miyachi, Yasunori Fujii, Hirotaka Terai. Development of superconducting devices supporting radio astronomy. IEICE Transactions on Electronics. 2021. 9. 411-421
Sho Masui, Yasumasa Yamasaki, Hideo Ogawa, Hiroshi Kondo, Koki Yokoyama, Takeru Matsumoto, Taisei Minami, Masanari Okawa, Ryotaro Konishi, Sana Kawashita, et al. Development of a new wideband heterodyne receiver system for the Osaka 1.85 m mm-submm telescope: Receiver development and the first light of simultaneous observations in 230 GHz and 345 GHz bands with an SIS-mixer with 4-21 GHz IF output. Publications of the Astronomical Society of Japan. 2021. 73. 4. 1100-1115

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MISC (3)：

T. Kojima, H. Kiuchi, K. Uemizu, Y. Uzawa, M. Kroug, A. Gonzalez, T. Dippon, T. Kageura. Demonstration of a wideband submillimeter-wave low-noise receiver with 4-21 GHz IF output digitized by a high-speed 32 GSps ADC. Astronomy & Astrophysics. 2020. 640. L9-L9
Design of substrate integrated waveguides and a test fixture and the development of loss measurement method at terahertz frequencies. 2016. 25. 2. 55-62
ENDO Akira, NOGUCHI Takashi, KROUG Matthias, SHITOV Sergey V., SHAN Wenlei, TAMURA Tomonori, KOJIMA Takafumi, UZAWA Yoshinori, SAKAI Takeshi, INOUE Hirofumi, et al. A novel THz SIS mixer with a NbTiN-groundplane and SIS micro-trylayers directly grown on a quartz substrate. IEICE technical report. 2008. 108. 152. 13-18

Awards (6)：

2022/04 - MEXT Young Scientists' Prize, in the Commendations for Science and Technology by MEXT
2018/11 - IEEE Microwave Theory and Techniques Society Japan Young Engineer Award
2014/03 - 日本天文学会日本天文学会研究奨励賞
2011/03 - 応用物理学会超伝導分科会研究奨励賞
2010/04 - 未踏科学技術協会超伝導科学技術賞

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Association Membership(s) (4)：

IEEE , THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS , THE ASTRONOMICAL SOCIETY OF JAPAN , THE JAPAN SOCIETY OF APPLIED PHYSICS

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