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 (58)：

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
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
Ivan P. Nevirkovets, Takafumi Kojima, Yoshinori Uzawa, Paul G. Kotula, Nancy Missert, Oleg A. Mukhanov. Characterization of Amplification Properties of the Superconducting-Ferromagnetic Transistor. IEEE Transactions on Applied Superconductivity. 2020. 30. 7
Y. Kozuki, Y. Uzawa, T. Kojima, W. Shan, T. Sakai. Observation of Frequency Up-Conversion Gain in SIS Junctions at W Band. Journal of Low Temperature Physics. 2020. 200. 5-6. 255-260

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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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