K
K. Murata
Researcher at Nippon Telegraph and Telephone
Publications - 55
Citations - 1180
K. Murata is an academic researcher from Nippon Telegraph and Telephone. The author has contributed to research in topics: Monolithic microwave integrated circuit & Phase-shift keying. The author has an hindex of 18, co-authored 55 publications receiving 1103 citations.
Papers
More filters
Journal ArticleDOI
120-GHz-Band Wireless Link Technologies for Outdoor 10-Gbit/s Data Transmission
Akihiko Hirata,Toshihiko Kosugi,H. Takahashi,Jun Takeuchi,Hiroyoshi Togo,Makoto Yaita,Naoya Kukutsu,K. Aihara,K. Murata,Yasuhiro Sato,Tadao Nagatsuma,Yuichi Kado +11 more
TL;DR: In this paper, the authors investigated the maximum output power of these devices and compared the phase noise of MMW signals generated by high-speed uni-traveling carrier photodiodes (UTC-PD) and InP high-electron mobility transistor (HEMT) millimeter-wave (MMW) monolithic integrated circuits (MMICs).
Journal ArticleDOI
10-Gbit/s Wireless Link Using InP HEMT MMICs for Generating 120-GHz-Band Millimeter-Wave Signal
Akihiko Hirata,R. Yamaguchi,Toshihiko Kosugi,H. Takahashi,K. Murata,Tadao Nagatsuma,Naoya Kukutsu,Yuichi Kado,N. Iai,Satoshi Okabe,S. Kimura,H. Ikegawa,H. Nishikawa,T. Nakayama,T. Inada +14 more
TL;DR: In this article, a 120-GHz-band mm-wave monolithic integrated circuits (MMICs) were fabricated using 0.1-mum-gate InP-HEMTs and coplanar waveguides.
Journal ArticleDOI
Transmission Characteristics of 120-GHz-Band Wireless Link Using Radio-on-Fiber Technologies
Akihiko Hirata,H. Takahashi,R. Yamaguchi,Toshihiko Kosugi,K. Murata,Tadao Nagatsuma,Naoya Kukutsu,Yuichi Kado +7 more
TL;DR: In this paper, the transmission characteristics of a 120 GHz-band millimeter-wave wireless link are described and the effects of transmitting 120GHz-band optical subcarrier signals through single-mode fibers were theoretically and experimentally investigated.
Proceedings ArticleDOI
5.8-km 10-Gbps data transmission over a 120-GHz-band wireless link
Akihiko Hirata,Toshihiko Kosugi,H. Takahashi,Jun Takeuchi,K. Murata,Naoya Kukutsu,Yuichi Kado,Satoshi Okabe,T. Ikeda,F. Suginosita,Kazuyoshi Shogen,H. Nishikawa,Akihiko Irino,T. Nakayama,Naohiro Sudo +14 more
TL;DR: 120-GHz-band wireless equipment that can transmit 10-Gbit/s data signal over a distance of more than 5 km is developed and a millimeter-wave amplifier that integrates 0.08-µm-gate-length InGaAs/InP composite-channel high-electron-mobility transistors is used to increase the output power.
Journal ArticleDOI
Effect of Rain Attenuation for a 10-Gb/s 120-GHz-Band Millimeter-Wave Wireless Link
Akihiko Hirata,R. Yamaguchi,H. Takahashi,Toshihiko Kosugi,K. Murata,Naoya Kukutsu,Yuichi Kado +6 more
TL;DR: In this paper, the effects of rain attenuation on the 120-GHz band wireless link during the heavy rainy period (from July to September, 2008) and annual period(from March to December, 2008).