Over-10-dBm output uni-traveling-carrier photodiode module integrating a power amplifier for wireless transmissions in the 125-GHz band. - Hiroshi Ito 005; Tomofumi Furuta; Toshihiko Kosugi; Akihiko Hirata; Hiroyuki Takahashi; Yoshifumi Muramoto; Masami Tokumitsu; Yasuhiro Sato; Tadao Nagatsuma; Tadao Ishibashi (IEICE Electron. Express, 2005)

Low-Phase Noise Photonic Millimeter-Wave Generator Using an AWG Integrated with a 3-dB Combiner. - Akihiko Hirata; Hiroyoshi Togo; Naofumi Shimizu; Hiroshi Takahashi; Katsunari Okamoto; Tadao Nagatsuma (IEICE Trans. Electron., 2005)

A 125-GHz 140-mW InGaAs/InP composite-channel HEMT MMIC power amplifier module. - Toshihiko Kosugi; Hiroki Sugiyama; Koichi Murata; Hiroyuki Takahashi; Akihiko Hirata; Naoya Kukutsu; Yuichi Kado; Takatomo Enoki (IEICE Electron. Express, 2009)

10-Gbit/s Bi-directional wireless data transmission system using 120-GHz-band ortho-mode transducers. - Jun Takeuchi; Akihiko Hirata; Hiroyuki Takahashi; Naoya Kukutsu (RWS, 2012)

Broadband InP MMICs for 120 GHz wireless data communications. - Toshihiko Kosugi; Hiroyuki Takahashi; Akihiko Hirata; Koichi Murata (RWS, 2013)

Design and Measurement of the Plate Laminated Waveguide Slot Array Antenna and Its Feasibility for Wireless Link System in the 120 GHz Band. - Dongjin Kim; Jiro Hirokawa; Kimio Sakurai; Makoto Ando; Takuma Takada; Tadao Nagatsuma; Jun Takeuchi; Akihiko Hirata (IEICE Trans. Commun., 2013)

Evaluation of Interference between Parallel 120-GHz-Band Wireless Link Systems with High-Gain Cassegrain Antennas. - Jun Takeuchi; Akihiko Hirata; Hiroyuki Takahashi; Naoya Kukutsu (IEICE Trans. Electron., 2013)

10-Gbit/s close-proximity wireless system meeting the regulation for extremely low-power radio stations. - Hiroyuki Takahashi; Akihiko Hirata; Katsuhiro Ajito; Shintaro Hisatake; Tadao Nagatsuma (IEICE Electron. Express, 2014)

120-GHz-Band Amplifier Module with Hermetic Sealing Structure for 10-Gbit/s Wireless System. - Hiroyuki Takahashi; Toshihiko Kosugi; Akihiko Hirata; Jun Takeuchi; Koichi Murata; Naoya Kukutsu (IEICE Trans. Electron., 2014)

A Finline Orthomode Transducer for 120-GHz-Band Wireless Links. - Jun Takeuchi; Akihiko Hirata; Hiroyuki Takahashi; Naoya Kukutsu (IEICE Trans. Electron., 2014)

10-Gbit/s Bidirectional and 20-Gbit/s Unidirectional 2-ch Wireless Data Transmission System Using 120-GHz-Band Finline Orthomode Transducers. - Jun Takeuchi; Akihiko Hirata; Hiroyuki Takahashi; Naoya Kukutsu; Yoshiaki Yamada; Kei Kitamura; Mitsuhiro Teshima (IEICE Trans. Electron., 2014)

Millimeter-wave system technologies for wireless communications, imaging, and sensing. - Akihiko Hirata (IEICE Electron. Express, 2015)

Alignment Control System Using Beam-Tilting 1-D Waveguide-Slot Array Antennas for 120-GHz-Band Corporate-Feed High-Gain 2-D Arrays. - Akihiko Hirata; Jun Takeuchi; Keisuke Hashimoto; Jiro Hirokawa (IEICE Trans. Commun., 2017)

Analysis and Experimental Study of Magnetic-Field Amplification by a Double Coil. - Ai-ichiro Sasaki; Olivier Ouellette; Maxime Beaudry-Marchand; Akihiko Hirata; Hiroki Morimura (IEEE Trans. Ind. Electron., 2017)

Absorber Integrated Planar Slot Array Antenna for Suppression of Multiple Reflection in 120-GHz-Band Close-Proximity Wireless System. - Akihiko Hirata; Jiro Hirokawa (IEICE Trans. Electron., 2018)

Contrast Enhancement of 76.5 GHz-Band Millimeter-Wave Images Using Near-Field Scattering for Non-Destructive Detection of Concrete Surface Cracks. - Akihiko Hirata; Makoto Nakashizuka; Koji Suizu; Yoshikazu Sudo (IEICE Trans. Electron., 2020)

Transmission Characteristics Control of 120 GHz-Band Bandstop Filter by Coupling Alignment-Free Lattice Pattern. - Akihiko Hirata; Koichiro Itakura; Taiki Higashimoto; Yuta Uemura; Tadao Nagatsuma; Takashi Tomura; Jiro Hirokawa; Norihiko Sekine; Issei Watanabe; Akifumi Kasamatsu (IEICE Trans. Electron., 2021)

Control of 120-GHz-Band Split Ring Resonator Filter by Coupling Lattice Pattern Substrate. - Koichiro Itakura; Akihiko Hirata; Masato Sonoda; Taiki Higashimoto; Tadao Nagatsuma; Takashi Tomura; Jiro Hirokawa; Norihiko Sekine; Issei Watanabe; Akifumi Kasamatsu (IEICE Trans. Electron., 2021)

Small Pipe Inspection Robots with Wireless Communication Using Microwave Guided Modes Propagating Along a Pipe Wall. - Masato Mizukami; Masami Yamaguchi; Hiroshi Murata; Akihiko Hirata (SMC, 2023)

Evaluation of Transmission Characteristics of 120-GHz-Band Close-Proximity Wireless Links Using Split-Ring-Resonator Absorber Integrated Planar Slot Antenna. - Akihiko Hirata; Tubasa Saijo; Yuma Kawamoto; Tadao Nagatsuma; Issei Watanabe; Norihiko Sekine; Akifumi Kasamatsu (IEICE Trans. Electron., 2023)

300-GHz-Band Dual-Band Bandstop Filter Based on Two Different Sized Split Ring Resonators. - Akihiko Hirata (IEICE Trans. Electron., 2024)

10-Gbit/s Data Transmission Using 120-GHz-Band Contactless Communication with SRR Integrated Glass Substrate. - Tomohiro Kumaki; Akihiko Hirata; Tubasa Saijo; Yuma Kawamoto; Tadao Nagatsuma; Osamu Kagaya (IEICE Trans. Electron., 2024)

Improvement of Channel Capacity of MIMO Communication Using Yagi-Uda Planar Antennas with a Propagation Path through a PVC Pipe Wall. - Akihiko Hirata; Keisuke Akiyama; Shunsuke Kabe; Hiroshi Murata; Masato Mizukami (IEICE Trans. Commun., 2024)

Evaluation of Interference between 300 GHz Band Fronthaul Links Using Measured High Gain Antenna Radiation Patterns. - Ken Watanabe; Ryo Okumura; Akihiko Hirata; Thomas Kürner (IEICE Trans. Commun., 2025)