Alignment Control System using Beam-tilting 1-D Waveguide-slot Array Antennas for 120-GHz-band Corporate-feed High-gain 2-D Arrays, A. Hirata, J. Takeuchi, K. Hashimoto, and J. Hirokawa, Trans. IEICE B, 査読有、 Vol.E100-B,No.01, 2017. （掲載決定）
Akihiko Hirata, and Makoto Yaita, Ultrafast Terahertz Wireless Communications Technologies, IEEE Transactions on Terahertz Science and Technology, vol. 5, no. 6, pp. 1128-1132, November, 2015.
Akihiko Hirata, Millimeter-wave system technologies for wireless communications, imaging, and sensing, IEICE Electronics Express, Vol. 12, no. 13, pp. 20152003, 2015.
Keiichiro Shiraga, Tetsuhito Suzuki, Naoshi Kondo, Takuro Tajima, Masahito Nakamura, Hiroyoshi Togo, Akihiko Hirata, Katsuhiro Ajito, and Yuichi Ogawa, Broadband Dielectric Spectroscopy of Glucose Aqueous Solution: Analysis of the Hydration State and the Hydrogen Bond Network, J. Chemical Physics, 142, 234504, 2015.
Hiroyuki Takahashi, Toshihiko Kosugi, Akihiko Hirata, Jun Takeuchi, Koichi Murata, and Naoya Kukutsu, 120-GHz-band amplifier module with hermetic sealing structure for 10-Gib/ts wireless system, IEICE Trans. Electron., Vol.E97-C, No.6, pp.583-591, June, 2014.
Jae-Young Kim, Hidetaka Nishi, Ho-Jin Song,Hiroshi Fukuda, Makoto Yaita, Akihiko Hirata, and Katsuhiro Ajito, Compact and stable THz vector spectroscopy using silicon photonics technology, Optic Express, Vol. 22, Issue 6, pp. 7178-7185, March, 2014.
Dongjin Kim, Jiro Hirokawa, Makoto Ando, Jun Takeuchi, and Akihiko Hirata, 64x64-element and 32x32-element slot array antennas using double-layer hollow-waveguide corporate-feed in the 120 GHz band, IEEE Transactions on Antennas and Propagation, Vol. 62, No. 3, pp.1507-1512, March 2014.
Hiroyuki Takahashi, Akihiko Hirata, Katsuhiro Ajito, Shintaro Hisatake, and Tadao Nagatsuma, 10-Gbit/s close-proximity wireless system meeting the regulation for extremely low-power radio stations, IEICE Electronics Express , Vol. 11 (2014) No. 3, pp. 1-7, February, 2014.
Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, Naoya Kukutsu, Yoshiaki Yamada, Kei Kitamura, and 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 Transactions on Electronics, vol.E97-C, no.2, pp.101-110, February, 2014.
Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, and Naoya Kukutsu, A Finline Orthomode Transducer for 120-GHz-band Wireless Links, IEICE Transactions on Electronics, vol.E97-C, no.2, pp.111-119, February, 2014.
Jae-Young Kim, Ho-Jin Song, Makoto Yaita, Akihiko Hirata, and Katsuhiro Ajito, CW-THz vector spectroscopy and imaging system based on 1.55-µm fiber-optics, Optic Express, Vol. 22, Issue 2, pp. 1735-1741, January, 2014.
Hiroyuki Takahashi, Toshihiko Kosugi, Akihiko Hirata, Jun Takeuchi, Koichi Murata, and Naoya Kukutsu, 120-GHz-Band Fully Integrated Wireless Link Using QSPK for Realtime 10-Gbit/s Transmission, IEEE Trans. on Microwave Theory and Techniques, vol. 61, no. 12, pp. 4745-4753, December, 2013.
Dongjin Kim, Jiro Hirokawa, Makoto Ando, Jun Takeuchi, and Akihiko Hirata, 4 x 4-Element Corporate-Feed Waveguide Slot Array Antenna With Cavities for the 120 GHz-Band, IEEE Trans. on Antennas and propagation, vol. 61, no. 12, pp. 5968-5975, December, 2013.
Jun Takeuchi, Akihiko Hirata, Hiroyuki Takahashi, and Naoya Kukutsu, Evaluation of Interference between Parallel 120-GHz-Band Wireless Link Systems with High-Gain Cassegrain Antennas, IEICE Transactions on Electronics, Vol.E96-C No.10 pp.1294-1300, October, 2013.
Dongjin Kim, Jiro Hirokawa, Kimio Sakurai, Makoto Ando, Takuma Takada, Tadao Nagatsuma, Jun Takeuchi, and 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 Transactions on Communications, vol. E96-B, no. 8, pp 2102-2011, August, 2013.
Akihiko Hirata, Toshihiko Kosugi, Hiroyuki Takahashi, Jun Takeuchi, Hiroyoshi Togo, Makoto Yaita, Naoya Kukutsu, Kimihisa Aihara, Koich Murata, Yasuhiro Sato, Tadao Nagatsuma, and Yuichi Kado, 120-GHz-Band Wireless Link Technologies for Outdoor 10-Gbit/s Data Transmission, IEEE Transactions on Microwave Theory and Techniques, vol. 60, no. 3, pp. 881-895, March, 2012.
Hiroyuki Takahashi, Toshihiko Kosugi, Akihiko Hirata, and Koichi Murata, Supporting Fast and Clear Video, IEEE Microwave Magazine, vol. 13, no. 6, pp. 54 - 64, September, 2012.
M. Shoji and A. Hirata, Ultrasonic Guided Wave Testing of Anchor Rods Embedded in Soil, IEEE International Ultrasonics Symposium, 5H-2, September, 2016.
A. Sasaki, A. Hirata, and H. Morimura, Magnetic-Field Amplification by a Double Coil, 2016 IEEE International Symposium on Antennas and Propagation/USNC-URSI National Radio Science meeting, 1051, Fajardo, Puerto Rico, June-July, 2016.
A. Hirata, J. Takeuchi, and J. Hirokawa, Alignment control of 120-GHz-band 2-D waveguide-slot arrays using beam-tilting 1-D array antennas, European Conference on Antenna and Propagation, CS22a-1, Davos, Switzerland, April 2016.
H. Hamada, T. Kosugi, H.-J. Song, M. Yaita, A. E. Moutaouakil, H. Matsuzaki, and A. Hirata, 300-GHz band 20-Gbps ASK transmitter module based on InP-HEMT MMICs, 2015 IEEE Compound Semiconductor IC Symposium (CSICS 2015), New Orleans, USA, October 2015.
D. Kitayama, H.-J. Song, M. Yaita, A. Hirata, Experimental Demonstration of Metamaterial Flat Lens at F-band, International Conference on Infrared, Millimeter, and Terahertz Waves (IrMMW-THz 2015), M3E-5,Hong Kong, China, August 2015.
T. Tajima, J.-Y. Kim, M. Nakamura, H.-J. Song, K. Ajito, and A. Hirata, Stable CW THz Spectroscopy with PLC-LN Hybrid Phase Modulator, International Conference on Infrared, Millimeter, and Terahertz Waves (IrMMW-THz 2015), T3C-3, Hong Kong, China, August 2015.
A. Hirata and J. Takeuchi, 120-GHz-band Wireless Link Antenna Technologies for Polarization Multiplexing, European Conference on Antenna and Propagation, C10 60GHz.6, Lisbon, April 2015.
T. Kosugi, H. Hamada, H. Takahashi, H-J. Song, A. Hirata, H. Matsuzaki,H. Nosaka, 250-300 GHz waveguide module with ridge-coupler and InP-HEMTIC, 2014 Asia-Pacific Microwave Conference (APMC), Sendai, Japan, pp. 1133-1135, December 2014.
Y. Koda, S. Hisatake, K. Jae-Young Kim, A. Hirata, K. Ajito, T. Nagatsuma, Precise Phase Measurement of Continuous Terahertz-Wave Based on Balanced Self-Heterodyne Technique and Its Application to Phase-Contrast Imaging, 2014 Asia-Pacific Microwave Conference (APMC), pp. 1079-81, December 2014.
K. Hashimoto, J. Takeuchi, J. Hirokawa1, A. Hirata, and M.Ando, Design and Fabrication of a Dual-polarization Corporate-feed Waveguide 3232-slot Array Antenna for 120 GHz Band, International Symposium on Antennas and propagation, WE1D-03, Kaohsiung, Taiwan, December 2014.
A. Hirata, and J. Takeuchi, H. Takahashi, and J. Hirokawa, 120-GHz-band Wireless Communications Field Trials, the 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IrMMW-THz 2014), R4/A-38-2, Tucson, USA, September 2014.
J. Hirokawa, D. Kim, M. Ando, J. Takeuchi, A. Hirata, 43 dBi gain, 60% efficiency and 10% bandwidth hollow-waveguide slot array antenna in the 120 GHz band, 2013 Asia-Pacific Microwave Conference (APMC 2013), pp. 307-309, Soul, Korea, December 2013.
A. Hirata, J. Takeuchi, D. Kim, and J. Hirokawa, 10-Gbit/s dual channel transmission of 120-GHz-band wireless link using planar slot array antennas, 2013 European Microwave Conference, pp. 744-747, Nurnberg, German, October, 2013.
N. Q. Duong, M. Sano, J. Hirokawa, M. Ando, J. Takeuchi, A. Hirata, Design of a Linear Array of Transverse Slots without Cross-polarization to any Directions on a Hollow Rectangular Waveguide，International Symposium on Antennas and Propagation, pp.918-920, Nanjing, China, October 2013.
D.-J. Kim, J. Hirokawa, M. Ando, J. Takeuchi and A. Hirata, 4x4-element Corporate-feed Plate-laminated Waveguide Slot Array Antenna with Cavities for the 120 GHz-band, Proc. of IEEE AP-S International Symposium, pp. 230-231, Orlando, FL, USA, July 2013.
J. Hirokawa, D.-J. Kim, M. Ando, J. Takeuchi and A. Hirata, Wideband Waveguide Slot Array Antennas with Corporate-feed in 120GHz and 350GHz Bands, 2013 International Symposium on Electromagnetic Theory EMTS 2013, pp. 866-867, Hiroshima, Japan, May 2013.
T. Kosugi, H. Takahashi, A. Hirata, and K. Murata, Broadband InP MMICs for 120 GHz Wireless Data Communications, 2013 IEEE Radio and Wireless Symposium (RWS) pp. 49-51, 2013.
J. Takeuchi, A. Hirata, H. Takahashi, and N. Kukutsu, 20-Gbit/s unidirectional wireless system using polarization multiplexing for 12-ch HDTV signal transmission, 2012 Asia Pacific Microwave Conference (APMC 2012), pp.142-144, 2012.
H. Takahashi, A. Hirata, J. Takeuchi, N. Kukutsu, T. Kosugi, and K. Murata, 120-GHz-band 20-Gbit/s transmitter and receiver MMICs using quadrature phase shift keying, 2012 7th European Microwave Integrated Circuit Conference (EuMIC), pp. 313-16, 2012.
A. Hirata, H. Takahashi, J. Takeuchi, and N. Kukutsu, Technology and Standardization Trends for Upper-Millimeter-Wave Wireless Links, Thailand–Japan MicroWave 2012, TH4-2, August 2012.
A. Hirata, J. Takeuchi, H. Takahashi, and N. Kukutsu, Rain attenuation fade-slope characteristics of 120-GHz-band wireless links, 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting, 314.1, July,2012.
A. Hirata, H. Takahashi, J. Takeuchi, N. Kukutsu, and T. Nagatsuma, Photonic and Electronic Technologies for 10-Gbit/s Outdoor Data Transmission Using 120-GHz-Band Wireless Link, Asia-Pacific Microwave Photonics Conference (APMP) 2012, ThB-2, April 2012.
D. Kim, J. Hirokawa, M. Ando, T. Takada, T. Nagatsuma, J. Takeuchi, and A. Hirata, Design and Measurement of Plate Laminated Waveguide Slot Array Antennas in Millimeter and Sub-millimeter Wave Regions, Asia-Pacific Microwave Photonics Conference (APMP) 2012, WD-4, 2012.
A. Hirata, H. Takahashi, J. Takeuchi, N. Kukutsu, K. Dongjin, and J. Hirokawa, 120-GHz-band antenna technologies for over-10-Gbps wireless data transmission, 2012 6th European Conference on Antennas and Propagation (EuCAP), pp. 2564-2568, 2012.
J. Takeuchi, A. Hirata, H. Takahashi, and N. Kukutsu, 10-Gbit/s Bi-directional wireless data transmission system using 120-GHz-band ortho-mode transducers, 2012 IEEE Radio and Wireless Symposium (RWS), pp. 63-66, 2012.