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 Results 1 - 20 of 56  /  [Next]  
Committee Date Time Place Paper Title / Authors Abstract Paper #
MW 2022-03-03
14:45
Online Online Frequency Characteristics on Vector Regulator Adjustment of Power Amplifier for Massive MIMO Base Stations
Kazuya Miyamoto, Shoichi Narahashi (Setsunan Univ.), Yasunori Suzuki, Hiroshi Okazaki (NTT DOCOMO) MW2021-123
This paper presents Frequency Characteristics on Vector Regulator Adjustment of 3.5-GHz Band Power Amplifier. Experiment... [more] MW2021-123
pp.69-72
AP, MW
(Joint)
2017-09-21
14:00
Saitama Saitama University High Frequency Analog Beam Forming by Frequency Control of Local Oscillator
Atsushi Fukuda, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2017-68
This paper proposes a novel configuration for a phased array antenna system (PAS) that achieves ultra-broadband transmis... [more] MW2017-68
pp.1-4
AP, MW
(Joint)
2017-09-21
14:25
Saitama Saitama University A Study of Quasi-Millimeter Wave Integrated Front-End Module Including Antenna and Filter
Yasunori Suzuki, Kei Satoh, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO), Takana Kaho, Yo Yamaguchi, Maki Arai, Hiroyuki Shiba (NTT) MW2017-69
 [more] MW2017-69
pp.5-9
AP, MW
(Joint)
2017-09-21
14:50
Saitama Saitama University A Study of Quasi-Millimeter Wave Frontend ICs and Modules
Takana Kaho, Yo Yamaguchi, Maki Arai, Hiroyuki Shiba (NTT), Yasunori Suzuki, Kei Sato, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2017-70
Application of Massive MIMO and beamforming technology using array antennas in the quasi-millimeter wave band is being ... [more] MW2017-70
pp.11-15
AP, MW
(Joint)
2016-09-15
14:50
Ibaraki AIST Radiation characteristics of bended flexible dielectric waveguide for area formation of millimeter-wave wireless communication systems
Kunihiro Kawai, Atsushi Fukuda, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2016-77
This paper presents radiation characteristics of two bended flexible dielectric waveguides in millimeter wave frequencie... [more] MW2016-77
pp.23-26
AP
(2nd)
2016-03-01
11:25
Overseas Telecommunications University, Nha Trang, Vietnam Numerical Estimation of 4.4GHz-band Propagation Characterisics in Aircraft Cabin Using Large-Scale FDTD analysis
Kanji Yahagi, Masami Shirafune, Takashi Hikage, Manabu Yamamoto, Shoichi Narahashi, Toshio Nojima (Hokkaido Univ.), Syunichi Futatsumori, Akiko Kohmura, Naruto Yonemoto (ENRI)
 [more]
MW, AP
(Joint)
2015-09-17
10:30
Tochigi Oyama National College of Tech. An estimation of third order PIM using one continuous wave
Kunihiro Kawai, Atsushi Fukuda, Yuta Takagi, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2015-87
This paper presents an estimation method for a third order passive intermodulation distortion (PIM) using one continuous... [more] MW2015-87
pp.1-8
MW, AP
(Joint)
2015-09-17
13:55
Tochigi Oyama National College of Tech. [Invited Lecture] RF front-end configuration of Massive-MIMO base station
Yasunori Suzuki, Kei Satoh, Makoto Sumi, Atsushi Fukuda, Shoichi Narahashi (NTT DOCOMO) AP2015-83 MW2015-90
This paper presents an overview of requirements and technical issues regarding a RF front-end module for Massive-MIMO ba... [more] AP2015-83 MW2015-90
pp.21-25(AP), pp.19-23(MW)
EMCJ, WPT
(Joint)
2015-01-22
14:00
Okinawa Okinawaken Jichikaikan A Novel Wide Dynamic Range and Dual Band Rectifier Design for Wireless Power Transfer System
Hiroto Sakaki, Fumito Kuroiwa, Masanobu Tsujii, Kenjiro Nishikawa (Kagoshima Univ.), Kunihiro Kawai, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) WPT2014-81
 [more] WPT2014-81
pp.19-24
AP, MW
(Joint)
2014-09-18
09:30
Tokyo Tokyo Institute of Technology, Ookayama Campus [Invited Lecture] A Basic Study on Quad-band Bandpass Filter with Line Structure Comprising Cascade Connection of CRLH-TL Cells Having Two Different Element Values
Kei Satoh, Yasunori Suzuki, Yuta Takagi, Shoichi Narahashi (NTT DOCOMO) AP2014-91 MW2014-84
This paper presents a basic study on a quad-band bandpass filter (QBPF) with a line structure comprising cascade connect... [more] AP2014-91 MW2014-84
pp.1-4
AP, MW
(Joint)
2014-09-19
13:00
Tokyo Tokyo Institute of Technology, Ookayama Campus An RF front-end circuit for inter-band carrier aggregation
Kunihiro Kawai (NTT DOCOMO), Mitsumasa Nakajima (NTT), Yuta Takagi, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2014-95
This paper proposes an RF front-end circuit for mobile terminals supporting inter-band carrier aggregation using two fre... [more] MW2014-95
pp.55-58
MW 2014-05-22
09:30
Kyoto Doshisha Univ. A Circuit Construction of Parallel Ring-Lines Type Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines
Yousuke Daimon, Tadashi Kawai, Akira Enokihara, Isao Ohta (Univ. of Hyogo), Kei Satoh, Yasunori Suzuki, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2014-25
 [more] MW2014-25
pp.7-12
MW 2014-03-04
11:50
Ehime Ehime University Design of Broadband Branch-Line Hybrid with Loose Coupling Utilizing Open-/Short-Circuited Coupled Transmission Lines
Nobuo Nakajima, Tadashi Kawai, Akira Enokihara, Isao Ohta (Univ. of Hyogo), Kei Satoh, Yasunori Suzuki, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2013-201
This paper describes broadband branch-line hybrids with loose coupling factors utilizing open-/short-circuited coupled t... [more] MW2013-201
pp.23-27
MW 2013-11-21
10:00
Kagoshima Kagoshima Prefectural Culture Center Dual-Band Linearization of Digital Predistorter Compensating Frequency-Dependent IMD components
Yasunori Suzuki, Junya Ohkawara, Shoichi Narahashi (DOCOMO) MW2013-132
This paper presents a dual-band digital predistortion linearizer (DPDL) compensating frequency-dependent imtertmodualtio... [more] MW2013-132
pp.5-10
MW, AP
(Joint)
2013-09-13
16:15
Tokyo NHK Science Tech. Research Lab. Super High Bit Rate Mobile Future Radio Access System using SHF/EHF Bands
Yukihiko Okumura, Shoichi Narahashi, Tetsuro Imai, Satoshi Suyama, Hiroshi Okazaki, Yasunori Suzuki (NTT DOCOMO) MW2013-99
In this report, in order to realize future super high bit rate and high capacity mobile communication network, on the pr... [more] MW2013-99
pp.65-70
MW 2013-03-06
10:00
Hiroshima Hiroshima Univ. Analysis on a new matching network for a compact multi-band PA
Takayuki Furuta, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2012-158
 [more] MW2012-158
pp.1-6
MW 2013-03-06
13:25
Hiroshima Hiroshima Univ. Miniaturization of a Multilayered Dual-Band Bandpass Filter
Yuta Takagi, Kei Satoh, Shoichi Narahashi (NTT DOCOMO) MW2012-164
 [more] MW2012-164
pp.33-36
MW 2012-12-13
16:15
Yamanashi Univ. of Yamanashi Parallel-Ring-Type Rat-Race Circuit for Loose Coupling Utilizing Composite Right/Left-Handed Transmission Lines
Yuma Simitomo, Tadashi Kawai, Akira Enokihara, Isao Ohta (Univ. of Hyogo), Kei Satoh, Yasunori Suzuki, Hiroshi Okazaki, Shoichi Narahashi (NTT DOCOMO) MW2012-132
This paper treats a parallel-ring-type rat-race circuit for loose coupling utilizing composite right-/left-handed transm... [more] MW2012-132
pp.31-36
MW 2012-11-21
14:45
Okinawa   [Special Talk] Report on 2012 IEEE MTT-S International Microwave Symposium
Takashi Shimizu (Utsunomiya Univ.), Masataka Ohira (Saitama Univ.), Hiroshi Okazaki (NTT DOCOMO), Chun-Ping Chen (Kanagawa Univ.), Shoichi Narahashi (NTT DOCOMO), Ramesh Pokharel (Kyushu Univ.), Koji Yamanaka (Mitsubishi Electric Corp.) MW2012-116
This is a report on 2012 IEEE MTT-S International Microwave Symposium held at Montreal, QC, CA, June 18-22, 2012. It co... [more] MW2012-116
pp.13-22
SR 2012-05-24
17:15
Kanagawa Keio univ. at Hiyoshi [Panel Discussion] Multi-band operation for mobile terminals
Shoichi Narahashi, Hiroshi Okazaki, Atsushi Fukuda, Takayuki Furuta, Kunihiro Kawai, Kei Satoh, Yuta Takagi (NTT DOCOMO) SR2012-12
It is a key issue for radio frequency (RF) circuits of future mobile terminals to equip with multi-band operation archit... [more] SR2012-12
pp.73-78
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