Akihiko HIRATA

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 
Publication:   
Publication Date: 2021/03/01
Vol. E104-C  No. 3  pp. 102-111
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
millimeter-wave filter, millimeter-wave propagation, millimeter-wave communication, 
 Summary | Full Text:PDF
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 
Publication:   
Publication Date: 2020/05/01
Vol. E103-C  No. 5  pp. 216-224
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
millimeter-wave radar, imaging systems, millimeter-waves, radar systems, radio propagation, 
 Summary | Full Text:PDF
Absorber Integrated Planar Slot Array Antenna for Suppression of Multiple Reflection in 120-GHz-Band Close-Proximity Wireless System
Akihiko HIRATA Jiro HIROKAWA 
Publication:   
Publication Date: 2018/10/01
Vol. E101-C  No. 10  pp. 791-800
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
millimeter-wave absorber, millimeter-wave communication, millimeter-wave antenna, 
 Summary | Full Text:PDF
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 
Publication:   
Publication Date: 2017/01/01
Vol. E100-B  No. 1  pp. 158-166
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
alignment control, millimeter waves, plate-laminated waveguide, diffusion bonding, slot antenna, 
 Summary | Full Text:PDF
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 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/06/01
Vol. E97-C  No. 6  pp. 583-591
Type of Manuscript:  PAPER
Category: Electronic Components
Keyword: 
millimeter-wave, waveguide, connection technique, wireless communication, 
 Summary | Full Text:PDF
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 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/02/01
Vol. E97-C  No. 2  pp. 101-110
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
ortho-mode transducer (OMT), finline, millimeter waves, polarization-multiplexing, 
 Summary | Full Text:PDF
A Finline Orthomode Transducer for 120-GHz-Band Wireless Links
Jun TAKEUCHI Akihiko HIRATA Hiroyuki TAKAHASHI Naoya KUKUTSU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/02/01
Vol. E97-C  No. 2  pp. 111-119
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
ortho-mode transducer (OMT), finline, millimeter waves, polarization-multiplexing, 
 Summary | Full Text:PDF
Evaluation of Interference between Parallel 120-GHz-Band Wireless Link Systems with High-Gain Cassegrain Antennas
Jun TAKEUCHI Akihiko HIRATA Hiroyuki TAKAHASHI Naoya KUKUTSU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/10/01
Vol. E96-C  No. 10  pp. 1294-1300
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Technologies and Applications for Microwave and Millimeter-Wave Systems)
Category: 
Keyword: 
millimeter-wave radio communications, broadband communications, photodiode, HEMT, 
 Summary | Full Text:PDF
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 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/08/01
Vol. E96-B  No. 8  pp. 2102-2111
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
waveguide antenna, diffusion bonding, full corporate feed, data transmission, 
 Summary | Full Text:PDF
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 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/07/01
Vol. E88-C  No. 7  pp. 1458-1464
Type of Manuscript:  Special Section PAPER (Special Section on Recent Technologies of Microwave and Millimeter-Wave Devices Focusing on Miniaturization and Advancement in Performance with Their Applications)
Category: Millimeter-Wave Technologies
Keyword: 
photonic millimeter-wave generator, planar lightwave circuit, arrayed-waveguide grating, phase noise, 
 Summary | Full Text:PDF
A Broadband 120-GHz Schottky-Diode Receiver for 10-Gbit/s Wireless Links
Tadashi MINOTANI Akihiko HIRATA Tadao NAGATSUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/08/01
Vol. E86-C  No. 8  pp. 1501-1505
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: 
Keyword: 
MMW wireless link, broadband receiver, photonic transmitter, 
 Summary | Full Text:PDF
Low-Cost Millimeter-Wave Photonic Techniques for Gigabit/s Wireless Link
Akihiko HIRATA Mitsuru HARADA Kenji SATO Tadao NAGATSUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/07/01
Vol. E86-C  No. 7  pp. 1123-1128
Type of Manuscript:  INVITED PAPER (Special Issue on Recent Progress in Microwave and Millimeter-wave Photonics Technologies)
Category: Photonic Links for Wireless Communications
Keyword: 
millimeter-wave wireless link, millimeter-wave photonic techniques, gigabit/s data transmission, 
 Summary | Full Text:PDF
3.0 Gbit/s Wireless Links Using 120-GHz Millimeter-Wave Photonic Techniques
Akihiko HIRATA Mitsuru HARADA Tadao NAGATSUMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/07/01
Vol. E85-C  No. 7  pp. 1516-1518
Type of Manuscript:  LETTER
Category: Optoelectronics
Keyword: 
millimeter-wave wireless link, photonic emitter, Gigabit Ethernet, 
 Summary | Full Text:PDF