研究者業績

榎原 晃

エノキハラ アキラ  (Akira Enokihara)

基本情報

所属
兵庫県立大学 大学院工学研究科電子情報工学専攻 教授
学位
工学博士(1987年3月 大阪大学)

J-GLOBAL ID
201901013978845436
researchmap会員ID
B000364293

論文

 96
  • Shotaro YASUMORI, Seiya MORIKAWA, Takanori SATO, Tadashi KAWAI, Akira ENOKIHARA, Shinya NAKAJIMA, Kouichi AKAHANE
    IEICE Transactions on Electronics E107-C(5) 146-149 2024年5月  査読有り責任著者
  • Masatoshi Fukunaga, Tadashi Kawai, Akira Enokihara
    Asia-Pacific Microwave Conference Proceedings, APMC 257-259 2023年12月  査読有り
    In this paper we have proposed a five-way power divider using unequal LC-ladder dividers. The LC-ladder divider is a compact power divider based on the Wilkinson power divider to solve size problem at a low frequency band (UHF) used by IoT devices. According to the circuit analysis, the proposed circuit can realize 67.5% bandwidth and flat transmission characteristics. In order to confirm actual operation of the divider, we have carried out electromagnetic analysis and measurement.
  • Shotaro Yasumori, Takanori Sato, Keita Morimoto, Tadashi Kawai, Akira Enokihara, Shinya Nakajima, Atsushi Kanno
    IEEE/OSA Journal of Lightwave Technology 41(23) 7059-7066 2023年12月  査読有り責任著者
  • Masatoshi Fukunaga, Tadashi Kawai, Akira Enokihara
    Asia-Pacific Microwave Conference Proceedings, APMC 2022-November 800-802 2022年11月  査読有り
    This paper deals with an unequal power divider with two matching frequencies by using LC-ladder circuits. This circuit that is constructed based on the Wilkinson power divider, consists of 9 elements. This circuit can achieve the same or wider bandwidth as the original one by holding the two matching frequencies close together. In order to confirm the practicality in IoT, the design center frequency is set to 920 MHz, and its actual measurement is carried out after circuit pattern design and analysis.
  • Shotaro Yasumori, Anna Hirai, Takanori Sato, Keita Morimoto, Tadashi Kawai, Akira Enokihara, Shinya Nakajima, Atsushi Kanno
    2022 IEEE International Topical Meeting on Microwave Photonics, MWP 2022 - Proceedings 2022年10月  査読有り
    We designed and evaluated 1×2 and 2×2 optical couplers using multimode interference (MMI) optical waveguides of Ti-diffused LiNbO3. A Mach-Zehnder electrooptic modulator (MZM) designed using those two MMI couplers as an optical power splitter and combiner was fabricated. Optical intensity modulation was achieved with a 50 dB extinction ratio. And the experimental results showed that the 2 ×2 MMI optical coupler could provide nearly equal power division with a 90° phase difference as a 90° hybrid. Next, we applied the MZM structure to the single sideband (SSB) modulation. 10 GHz microwave signals of 90° phase difference were fed to the modulation electrodes on the two arms of the MZM. The SSB modulation operation was confirmed from output light spectra, and the sideband suppression ratio of 39 dB was observed by miner adjustment of the optical phase bias.

書籍等出版物

 2

講演・口頭発表等

 217

担当経験のある科目(授業)

 5

共同研究・競争的資金等の研究課題

 5

産業財産権

 109