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Akihiko Hirata

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2020 – today

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2024
[j20]
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Akihiko Hirata, Keisuke Akiyama, Shunsuke Kabe, Hiroshi Murata, Masato Mizukami:
Improvement of Channel Capacity of MIMO Communication Using Yagi-Uda Planar Antennas with a Propagation Path through a PVC Pipe Wall. IEICE Trans. Commun. 107(1): 197-205 (2024)
[j19]
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Akihiko Hirata:
300-GHz-Band Dual-Band Bandstop Filter Based on Two Different Sized Split Ring Resonators. IEICE Trans. Electron. 107(4): 107-114 (2024)
[j18]
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Tomohiro Kumaki, Akihiko Hirata, Tubasa Saijo, Yuma Kawamoto, Tadao Nagatsuma, Osamu Kagaya:
10-Gbit/s Data Transmission Using 120-GHz-Band Contactless Communication with SRR Integrated Glass Substrate. IEICE Trans. Electron. 107(8): 223-230 (2024)
2023
[j17]
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Akihiko Hirata, Tubasa Saijo, Yuma Kawamoto, Tadao Nagatsuma, Issei Watanabe, Norihiko Sekine, Akifumi Kasamatsu:
Evaluation of Transmission Characteristics of 120-GHz-Band Close-Proximity Wireless Links Using Split-Ring-Resonator Absorber Integrated Planar Slot Antenna. IEICE Trans. Electron. 106(9): 458-465 (2023)
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Masato Mizukami, Masami Yamaguchi, Hiroshi Murata, Akihiko Hirata:
Small Pipe Inspection Robots with Wireless Communication Using Microwave Guided Modes Propagating Along a Pipe Wall. SMC 2023: 3571-3576
2021
[j16]
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Koichiro Itakura, Akihiko Hirata, Masato Sonoda, Taiki Higashimoto, Tadao Nagatsuma, Takashi Tomura, Jiro Hirokawa, Norihiko Sekine, Issei Watanabe, Akifumi Kasamatsu:
Control of 120-GHz-Band Split Ring Resonator Filter by Coupling Lattice Pattern Substrate. IEICE Trans. Electron. 104-C(3): 102-111 (2021)
[j15]
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Akihiko Hirata, Koichiro Itakura, Taiki Higashimoto, Yuta Uemura, Tadao Nagatsuma, Takashi Tomura, Jiro Hirokawa, Norihiko Sekine, Issei Watanabe, Akifumi Kasamatsu:
Transmission Characteristics Control of 120 GHz-Band Bandstop Filter by Coupling Alignment-Free Lattice Pattern. IEICE Trans. Electron. 104-C(10): 587-595 (2021)
2020
[j14]
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Akihiko Hirata, Makoto Nakashizuka, Koji Suizu, Yoshikazu Sudo:
Contrast Enhancement of 76.5 GHz-Band Millimeter-Wave Images Using Near-Field Scattering for Non-Destructive Detection of Concrete Surface Cracks. IEICE Trans. Electron. 103-C(5): 216-224 (2020)

2010 – 2019

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2018
[j13]
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Akihiko Hirata, Jiro Hirokawa:
Absorber Integrated Planar Slot Array Antenna for Suppression of Multiple Reflection in 120-GHz-Band Close-Proximity Wireless System. IEICE Trans. Electron. 101-C(10): 791-800 (2018)
2017
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Akihiko Hirata, Jun Takeuchi, Keisuke Hashimoto, Jiro Hirokawa:
Alignment Control System Using Beam-Tilting 1-D Waveguide-Slot Array Antennas for 120-GHz-Band Corporate-Feed High-Gain 2-D Arrays. IEICE Trans. Commun. 100-B(1): 158-166 (2017)
[j11]
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Ai-ichiro Sasaki, Olivier Ouellette, Maxime Beaudry-Marchand, Akihiko Hirata, Hiroki Morimura:
Analysis and Experimental Study of Magnetic-Field Amplification by a Double Coil. IEEE Trans. Ind. Electron. 64(4): 3216-3226 (2017)
2015
[j10]
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Akihiko Hirata:
Millimeter-wave system technologies for wireless communications, imaging, and sensing. IEICE Electron. Express 12(13): 20152003 (2015)
2014
[j9]
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Hiroyuki Takahashi, Akihiko Hirata, Katsuhiro Ajito, Shintaro Hisatake, Tadao Nagatsuma:
10-Gbit/s close-proximity wireless system meeting the regulation for extremely low-power radio stations. IEICE Electron. Express 11(3): 20130989 (2014)
[j8]
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Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, Naoya Kukutsu, Yoshiaki Yamada, Kei Kitamura, Mitsuhiro Teshima:
10-Gbit/s Bidirectional and 20-Gbit/s Unidirectional 2-ch Wireless Data Transmission System Using 120-GHz-Band Finline Orthomode Transducers. IEICE Trans. Electron. 97-C(2): 101-110 (2014)
[j7]
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Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, Naoya Kukutsu:
A Finline Orthomode Transducer for 120-GHz-Band Wireless Links. IEICE Trans. Electron. 97-C(2): 111-119 (2014)
[j6]
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Hiroyuki Takahashi, Toshihiko Kosugi, Akihiko Hirata, Jun Takeuchi, Koichi Murata, Naoya Kukutsu:
120-GHz-Band Amplifier Module with Hermetic Sealing Structure for 10-Gbit/s Wireless System. IEICE Trans. Electron. 97-C(6): 583-591 (2014)
2013
[j5]
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Dongjin Kim, Jiro Hirokawa, Kimio Sakurai, Makoto Ando, Takuma Takada, Tadao Nagatsuma, Jun Takeuchi, Akihiko Hirata:
Design and Measurement of the Plate Laminated Waveguide Slot Array Antenna and Its Feasibility for Wireless Link System in the 120 GHz Band. IEICE Trans. Commun. 96-B(8): 2102-2111 (2013)
[j4]
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Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, Naoya Kukutsu:
Evaluation of Interference between Parallel 120-GHz-Band Wireless Link Systems with High-Gain Cassegrain Antennas. IEICE Trans. Electron. 96-C(10): 1294-1300 (2013)
[c2]
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Toshihiko Kosugi, Hiroyuki Takahashi, Akihiko Hirata, Koichi Murata:
Broadband InP MMICs for 120 GHz wireless data communications. RWS 2013: 49-51
2012
[c1]
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Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, Naoya Kukutsu:
10-Gbit/s Bi-directional wireless data transmission system using 120-GHz-band ortho-mode transducers. RWS 2012: 63-66

2000 – 2009

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2009
[j3]
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Toshihiko Kosugi, Hiroki Sugiyama, Koichi Murata, Hiroyuki Takahashi, Akihiko Hirata, Naoya Kukutsu, Yuichi Kado, Takatomo Enoki:
A 125-GHz 140-mW InGaAs/InP composite-channel HEMT MMIC power amplifier module. IEICE Electron. Express 6(24): 1764-1768 (2009)
2005
[j2]
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Hiroshi Ito, Tomofumi Furuta, Toshihiko Kosugi, Akihiko Hirata, Hiroyuki Takahashi, Yoshifumi Muramoto, Masami Tokumitsu, Yasuhiro Sato, Tadao Nagatsuma, Tadao Ishibashi:
Over-10-dBm output uni-traveling-carrier photodiode module integrating a power amplifier for wireless transmissions in the 125-GHz band. IEICE Electron. Express 2(16): 446-450 (2005)
[j1]
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Akihiko Hirata, Hiroyoshi Togo, Naofumi Shimizu, Hiroshi Takahashi, Katsunari Okamoto, Tadao Nagatsuma:
Low-Phase Noise Photonic Millimeter-Wave Generator Using an AWG Integrated with a 3-dB Combiner. IEICE Trans. Electron. 88-C(7): 1458-1464 (2005)

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