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Takashi Ohira
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2020 – today
- 2024
- [j35]Minoru Mizutani, Takashi Ohira:
Comprehensive Design Approach to Switch-Mode Resonant Power Amplifiers Exploiting Geodesic-to-Geodesic Impedance Conversion. IEICE Trans. Electron. 107(10): 307-314 (2024) - 2023
- [j34]Ryoya Honda, Minoru Mizutani, Masaya Tamura, Takashi Ohira:
Class-E Synchronous RF Rectifier: Circuit Formulation, Geodesic Trajectory, Time-Domain Simulation, and Prototype Experiment. IEICE Trans. Electron. 106(11): 698-706 (2023)
2010 – 2019
- 2019
- [c12]Takashi Ohira, Satoshi Tsukamoto, Naoki Sakai, Shinji Abe, Masayoshi Sugino, Nobukazu Sakura, Kunihiko Sasaki:
Live Demonstration: An HF Capacitive Wireless Power Transfer to a Quad-Rotor Drone. ISCAS 2019: 1 - 2018
- [j33]Takashi Ohira:
Power transfer efficiency formulation for reciprocal and non-reciprocal linear passive two-port systems. IEICE Electron. Express 15(3): 20171196 (2018) - [j32]Sonshu Sakihara, Satoshi Kitabayashi, Naoki Sakai, Takashi Ohira:
Far-End Reactor Matching to a Traveling Load Along an RF Power Transmission Line. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 101-A(2): 396-401 (2018) - [j31]Takashi Ohira:
Power Transfer Theory on Linear Passive Two-Port Systems. IEICE Trans. Electron. 101-C(10): 719-726 (2018) - 2017
- [j30]Sonshu Sakihara, Masaru Takana, Naoki Sakai, Takashi Ohira:
Power Dependent Impedance Measurement Exploiting an Oscilloscope and Möbius Transformation. IEICE Trans. Electron. 100-C(10): 918-923 (2017) - [j29]Kyohei Yamada
, Takashi Ohira:
Graphical Representation of the Power Transfer Efficiency of Lumped-Element Circuits Based on Hyperbolic Geometry. IEEE Trans. Circuits Syst. II Express Briefs 64-II(5): 485-489 (2017) - 2016
- [j28]Kyohei Yamada, Naoki Sakai, Takashi Ohira:
Internal Power Loss Formulas of Lumped-Element Matching Circuits for High-Efficiency Wireless Power Transfer. IEICE Trans. Electron. 99-C(10): 1182-1189 (2016) - 2014
- [j27]Takanari Minami, Takashi Ohira:
Erratum: Unified active Q factor formula for use in noise spectrum estimation from Leeson's and Hajimiri's models [IEICE Electronics Express Vol 10 (2013) No 24 pp 20130806]. IEICE Electron. Express 11(1): 20148001 (2014) - [j26]Akiro Shimada, Shinsuke Ohtake, Yuichi Miyaji, Hideyuki Uehara, Takashi Ohira:
Power division ratio on multi-hop WPT considering coupling of the receiver with two couplers. IEICE Electron. Express 11(5): 20140034 (2014) - [j25]Takashi Ohira:
Extended k-Q product formulas for capacitive- and inductive-coupling wireless power transfer schemes. IEICE Electron. Express 11(9): 20140147 (2014) - [j24]Takashi Ohira:
Maximum available efficiency formulation based on a black-box model of linear two-port power transfer systems. IEICE Electron. Express 11(13): 20140448 (2014) - 2013
- [j23]Takashi Ohira:
Power efficiency and optimum load formulas on RF rectifiers featuring flow-angle equations. IEICE Electron. Express 10(11): 20130230 (2013) - [j22]Takanari Minami, Takashi Ohira:
Unified active Q factor formula for use in noise spectrum estimation from Leeson's and Hajimiri's models. IEICE Electron. Express 10(24): 20130806 (2013) - 2012
- [j21]Takashi Ohira:
Dedicated Q factor formulas stemming from oscillation frequency stability against source and load deviations. IEICE Electron. Express 9(7): 616-621 (2012) - 2011
- [j20]Keizo Inagaki, Takashi Ohira, Tetsuya Kawanishi, Masayuki Izutsu:
Beam steering array antenna controlled by optical wavelength. IEICE Electron. Express 8(15): 1221-1227 (2011) - [j19]Tuya Wuren, Takashi Ohira:
Active Q Factor Analysis for Non-uniform Microstrip Stub Colpitts FET Oscillators. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 94-A(2): 583-591 (2011) - 2010
- [j18]Takashi Ohira:
Extended Adler's injection locked Q factor formula for general one- and two-port active device oscillators. IEICE Electron. Express 7(19): 1486-1492 (2010)
2000 – 2009
- 2009
- [j17]Ranga Hettiarachchi, Mitsuo Yokoyama, Hideyuki Uehara, Takashi Ohira:
Interference Canceller Based on Cycle-and-Add Property for Single User Detection in DS-CDMA. IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 92-A(1): 298-306 (2009) - 2008
- [j16]Takashi Ohira, Tuya Wuren:
Pseudolinear Circuit Theory for Sinusoidal Oscillator Performance Maximization. IEICE Trans. Electron. 91-C(11): 1726-1737 (2008) - [j15]Chen Sun, Thomas Hunziker, Jun Cheng, Makoto Taromaru, Takashi Ohira:
Optimal Frame Splitting for Downlink MIMO Channels With Distributed Antenna Arrays. IEEE Trans. Veh. Technol. 57(6): 3848-3854 (2008) - 2007
- [j14]Chen Sun, Makoto Taromaru, Takashi Ohira:
Employing Coordinated Transmit and Receive Beamforming in Clustering Double-Directional Radio Channel. EURASIP J. Wirel. Commun. Netw. 2007 (2007) - [j13]Takashi Ohira, Kiyomichi Araki:
Active Q-Factor and Equilibrium Stability Formulation for Sinusoidal Oscillators. IEEE Trans. Circuits Syst. II Express Briefs 54-II(9): 810-814 (2007) - [j12]Thomas Hunziker, Jacir Luiz Bordim, Makoto Taromaru, Takashi Ohira:
Maximum-Likelihood Array Signal Decoding in the Presence of Block-Wise Stationary Cochannel Interference. IEEE Trans. Wirel. Commun. 6(4): 1476-1487 (2007) - 2006
- [j11]Takashi Ohira, Kiyomichi Araki:
Dimensional extension of Kurokawa's stability criterion for general multi-port device oscillators. IEICE Electron. Express 3(7): 143-148 (2006) - [j10]Takashi Ohira, Kiyomichi Araki:
Oscillator frequency spectrum as viewed from resonant energy storage and complex Q factor. IEICE Electron. Express 3(16): 385-389 (2006) - [j9]Chulgyun Park, Jun-ichi Takada
Spatial Fading Simulator Using a Cavity-Excited Circular Array (CECA) for Performance Evaluation of Antenna Arrays. IEICE Trans. Commun. 89-B(3): 906-913 (2006) - [j8]Takashi Ohira:
Special Section on Emerging Microwave Techniques. IEICE Trans. Electron. 89-C(12): 1796-1797 (2006) - [j7]Jun Cheng, Takashi Ohira, Koichi Kamoi, Yoichiro Watanabe:
Spreading Set With Error Correction for Multiple-Access Adder Channel. IEEE Trans. Inf. Theory 52(12): 5524-5529 (2006) - 2005
- [j6]Qing Han, Keizo Inagaki, Takashi Ohira:
Perturbation Analysis and Experimental Verification of Intermodulation and Harmonic Distortion for an Anti-Series Varactor Pair. IEICE Trans. Electron. 88-C(1): 89-97 (2005) - [j5]Qing Han, Brett Hanna, Takashi Ohira:
A Compact Espar Antenna with Planar Parasitic Elements on a Dielectric Cylinder. IEICE Trans. Commun. 88-B(6): 2284-2290 (2005) - [j4]Takashi Ohira:
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 52-II(12): 846-850 (2005) - 2004
- [j3]Thomas Hunziker, Tomoyuki Aono, Takashi Ohira:
An iterative beamforming and decoding procedure for wireless networks with uncoordinated channel access. IEEE Commun. Lett. 8(4): 256-258 (2004) - [j2]Takashi Ohira:
Mathematical proof of Leeson's oscillator noise spectrum model. IEICE Electron. Express 1(5): 109-114 (2004) - [j1]Kehu Yang, Takashi Ohira, Yimin Zhang, Chong-Yung Chi:
Super-exponential blind adaptive beamforming. IEEE Trans. Signal Process. 52(6): 1549-1563 (2004) - [c11]Kyouichi Iigusa, Takashi Ohira:
A simple and accurate mathematical model of electronically steerable parasitic array radiator antennas. CCNC 2004: 312-315 - [c10]Takuma Sawaya, Kyouichi Iigusa, Makoto Taromaru, Takashi Ohira:
Reactance diversity: proof-of-concept experiments in an indoor multipath-fading environment with a 5-GHz prototype planar ESPAR antenna. CCNC 2004: 678-680 - [c9]Thomas Hunziker, Tomoyuki Aono, Takashi Ohira:
An iterative beamforming technique for OFDM-based wireless networks with uncoordinated channel access. ICC 2004: 2751 - [c8]Thomas Hunziker, Jacir Luiz Bordim, Takashi Ohira, Shinsuke Tanaka:
An Interference Avoidance Technique for Ad Hoc Networks Employing Array Antennas. ICT 2004: 43-52 - [c7]Thomas Hunziker, Jacir Luiz Bordim, Takashi Ohira, Shinsuke Tanaka:
A CSMA/CA-based medium access scheme for array antenna-enhanced wireless ad hoc networks. ISWCS 2004: 230-234 - 2003
- [c6]Thomas Hunziker, Masaya Hashiguchi, Takashi Ohira:
Reception of coded OFDM signals in broad-band fading environments with strong cochannel interference. GLOBECOM 2003: 2310-2314 - [c5]Eddy Taillefer, Cyril Plapous, Jun Cheng, Kyouichi Iigusa, Takashi Ohira:
Reactance-domain MUSIC for ESPAR antennas (experiment). WCNC 2003: 98-102 - 2002
- [c4]Kehu Yang, Takashi Ohira, Yimin Zhang, Chong-Yung Chi:
A super-exponential blind adaptive beamforming algorithm. ICASSP 2002: 3073-3076 - [c3]Takashi Ohira:
Analog smart antennas: an overview. PIMRC 2002: 1502-1506 - 2001
- [c2]Takashi Ohira:
Emerging adaptive antenna techniques for wireless ad-hoc networks. ISCAS (4) 2001: 858-861 - [c1]Koichi Gyoda, Youiti Kado, Yuichiro Ohno, Kazuo Hasuike, Takashi Ohira:
WACNet - Wireless Ad-hoc Community Network. ISCAS (4) 2001: 862-865
Coauthor Index
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