Takashi Ohira

48 papers B 3C 1Misc 1Journal 36Unranked 7
YearRankTypeTitle / Venue / Authors
2025 J jnl
Coupling Quality Factor and Friis Formula Shake Hands on Wireless Power Transfer between Dipole Antennas.
IEICE Trans. Commun.
Shinji Abe, Qiaowei Yuan, Takashi Ohira
2024 J jnl
Comprehensive Design Approach to Switch-Mode Resonant Power Amplifiers Exploiting Geodesic-to-Geodesic Impedance Conversion.
IEICE Trans. Electron.
Minoru Mizutani, Takashi Ohira
2023 J jnl
Class-E Synchronous RF Rectifier: Circuit Formulation, Geodesic Trajectory, Time-Domain Simulation, and Prototype Experiment.
IEICE Trans. Electron.
Ryoya Honda, Minoru Mizutani, Masaya Tamura, Takashi Ohira
2019 C conf
Live Demonstration: An HF Capacitive Wireless Power Transfer to a Quad-Rotor Drone.
ISCAS
Takashi Ohira, Satoshi Tsukamoto, Naoki Sakai, Shinji Abe, Masayoshi Sugino, Nobukazu Sakura, Kunihiko Sasaki
2018 J jnl
Far-End Reactor Matching to a Traveling Load Along an RF Power Transmission Line.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Sonshu Sakihara, Satoshi Kitabayashi, Naoki Sakai, Takashi Ohira
2018 J jnl
Power Transfer Theory on Linear Passive Two-Port Systems.
IEICE Trans. Electron.
Takashi Ohira
2018 J jnl
Power transfer efficiency formulation for reciprocal and non-reciprocal linear passive two-port systems.
IEICE Electron. Express
Takashi Ohira
2017 J jnl
Graphical Representation of the Power Transfer Efficiency of Lumped-Element Circuits Based on Hyperbolic Geometry.
IEEE Trans. Circuits Syst. II Express Briefs
Kyohei Yamada, Takashi Ohira
2017 J jnl
Power Dependent Impedance Measurement Exploiting an Oscilloscope and Möbius Transformation.
IEICE Trans. Electron.
Sonshu Sakihara, Masaru Takana, Naoki Sakai, Takashi Ohira
2016 J jnl
Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer.
IEICE Trans. Electron.
Kyohei Yamada, Naoki Sakai, Takashi Ohira
2014 J jnl
Erratum: Unified active
IEICE Electron. Express
Takanari Minami, Takashi Ohira
2014 J jnl
Extended
IEICE Electron. Express
Takashi Ohira
2014 J jnl
Maximum available efficiency formulation based on a black-box model of linear two-port power transfer systems.
IEICE Electron. Express
Takashi Ohira
2014 J jnl
Power division ratio on multi-hop WPT considering coupling of the receiver with two couplers.
IEICE Electron. Express
Akiro Shimada, Shinsuke Ohtake, Yuichi Miyaji, Hideyuki Uehara, Takashi Ohira
2013 J jnl
Power efficiency and optimum load formulas on RF rectifiers featuring flow-angle equations.
IEICE Electron. Express
Takashi Ohira
2013 J jnl
Unified active
IEICE Electron. Express
Takanari Minami, Takashi Ohira
2012 J jnl
Dedicated
IEICE Electron. Express
Takashi Ohira
2011 J jnl
Active
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Tuya Wuren, Takashi Ohira
2011 J jnl
Beam steering array antenna controlled by optical wavelength.
IEICE Electron. Express
Keizo Inagaki, Takashi Ohira, Tetsuya Kawanishi, Masayuki Izutsu
2010 J jnl
Extended Adler's injection locked
IEICE Electron. Express
Takashi Ohira
2009 J jnl
Interference Canceller Based on Cycle-and-Add Property for Single User Detection in DS-CDMA.
IEICE Trans. Fundam. Electron. Commun. Comput. Sci.
Ranga Hettiarachchi, Mitsuo Yokoyama, Hideyuki Uehara, Takashi Ohira
2008 J jnl
Optimal Frame Splitting for Downlink MIMO Channels With Distributed Antenna Arrays.
IEEE Trans. Veh. Technol.
Chen Sun, Thomas Hunziker, Jun Cheng, Makoto Taromaru, Takashi Ohira
2008 J jnl
Pseudolinear Circuit Theory for Sinusoidal Oscillator Performance Maximization.
IEICE Trans. Electron.
Takashi Ohira, Tuya Wuren
2007 J jnl
Active Q-Factor and Equilibrium Stability Formulation for Sinusoidal Oscillators.
IEEE Trans. Circuits Syst. II Express Briefs
Takashi Ohira, Kiyomichi Araki
2007 J jnl
Employing Coordinated Transmit and Receive Beamforming in Clustering Double-Directional Radio Channel.
EURASIP J. Wirel. Commun. Netw.
Chen Sun, Makoto Taromaru, Takashi Ohira
2007 J jnl
Maximum-Likelihood Array Signal Decoding in the Presence of Block-Wise Stationary Cochannel Interference.
IEEE Trans. Wirel. Commun.
Thomas Hunziker, Jacir Luiz Bordim, Makoto Taromaru, Takashi Ohira
2006 J jnl
Dimensional extension of Kurokawa's stability criterion for general multi-port device oscillators.
IEICE Electron. Express
Takashi Ohira, Kiyomichi Araki
2006 J jnl
Oscillator frequency spectrum as viewed from resonant energy storage and complex Q factor.
IEICE Electron. Express
Takashi Ohira, Kiyomichi Araki
2006 J jnl
Spatial Fading Simulator Using a Cavity-Excited Circular Array (CECA) for Performance Evaluation of Antenna Arrays.
IEICE Trans. Commun.
Chulgyun Park, Jun-ichi Takada, Kei Sakaguchi, Takashi Ohira
2006 J jnl
Special Section on Emerging Microwave Techniques.
IEICE Trans. Electron.
Takashi Ohira
2006 J jnl
Spreading Set With Error Correction for Multiple-Access Adder Channel.
IEEE Trans. Inf. Theory
Jun Cheng, Takashi Ohira, Koichi Kamoi, Yoichiro Watanabe
2005 J jnl
A Compact Espar Antenna with Planar Parasitic Elements on a Dielectric Cylinder.
IEICE Trans. Commun.
Qing Han, Brett Hanna, Takashi Ohira
2005 J jnl
Perturbation Analysis and Experimental Verification of Intermodulation and Harmonic Distortion for an Anti-Series Varactor Pair.
IEICE Trans. Electron.
Qing Han, Keizo Inagaki, Takashi Ohira
2005 J jnl
Rigorous Q-factor formulation for one- and two-port passive linear networks from an oscillator noise spectrum viewpoint.
IEEE Trans. Circuits Syst. II Express Briefs
Takashi Ohira
2004 — conf
A CSMA/CA-based medium access scheme for array antenna-enhanced wireless ad hoc networks.
ISWCS
Thomas Hunziker, Jacir Luiz Bordim, Takashi Ohira, Shinsuke Tanaka
2004 — conf
A simple and accurate mathematical model of electronically steerable parasitic array radiator antennas.
CCNC
Kyouichi Iigusa, Takashi Ohira
2004 — conf
An Interference Avoidance Technique for Ad Hoc Networks Employing Array Antennas.
ICT
Thomas Hunziker, Jacir Luiz Bordim, Takashi Ohira, Shinsuke Tanaka
2004 J jnl
An iterative beamforming and decoding procedure for wireless networks with uncoordinated channel access.
IEEE Commun. Lett.
Thomas Hunziker, Tomoyuki Aono, Takashi Ohira
2004 — conf
An iterative beamforming technique for OFDM-based wireless networks with uncoordinated channel access.
ICC
Thomas Hunziker, Tomoyuki Aono, Takashi Ohira
2004 J jnl
Mathematical proof of Leeson's oscillator noise spectrum model.
IEICE Electron. Express
Takashi Ohira
2004 — conf
Reactance diversity: proof-of-concept experiments in an indoor multipath-fading environment with a 5-GHz prototype planar ESPAR antenna.
CCNC
Takuma Sawaya, Kyouichi Iigusa, Makoto Taromaru, Takashi Ohira
2004 J jnl
Super-exponential blind adaptive beamforming.
IEEE Trans. Signal Process.
Kehu Yang, Takashi Ohira, Yimin Zhang, Chong-Yung Chi
2003 B conf
Reactance-domain MUSIC for ESPAR antennas (experiment).
WCNC
Eddy Taillefer, Cyril Plapous, Jun Cheng, Kyouichi Iigusa, Takashi Ohira
2003 B conf
Reception of coded OFDM signals in broad-band fading environments with strong cochannel interference.
GLOBECOM
Thomas Hunziker, Masaya Hashiguchi, Takashi Ohira
2002 Misc conf
A super-exponential blind adaptive beamforming algorithm.
ICASSP
Kehu Yang, Takashi Ohira, Yimin Zhang, Chong-Yung Chi
2002 B conf
Analog smart antennas: an overview.
PIMRC
Takashi Ohira
2001 — conf
Emerging adaptive antenna techniques for wireless ad-hoc networks.
ISCAS (4)
Takashi Ohira
2001 — conf
WACNet - Wireless Ad-hoc Community Network.
ISCAS (4)
Koichi Gyoda, Youiti Kado, Yuichiro Ohno, Kazuo Hasuike, Takashi Ohira