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Koichi OGAWA

Effects of Received Power Imbalance on the Diversity Gain of a Digital TV MRC Array Antenna Koichi OGAWA Kazuhiro HONDA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2013/03/01 Vol. E96-B No. 3 pp. 811-819 Type of Manuscript: PAPER Category: Antennas and Propagation Keyword: maximum ratio combining (MRC), diversity antenna, power imbalance, digital TV, Monte Carlo simulation,
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Performance Analysis of MIMO Schemes in Residential Home Environment via Wideband MIMO Propagation Measurement Gia Khanh TRAN Nguyen Dung DAO Kei SAKAGUCHI Kiyomichi ARAKI Hiroshi IWAI Tsutomu SAKATA Koichi OGAWA
Publication: IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences Publication Date: 2010/04/01 Vol. E93-A No. 4 pp. 814-829 Type of Manuscript: PAPER Category: Communication Theory and Signals Keyword: MIMO-OFDM, wideband MIMO channel measurement, residential home environment, throughput performance evaluation,
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A Low Distortion and Low Noise Differential Amplifier Suitable for 3G LTE Applications Using the Even- and Odd-Mode Impedance Differences of a Bias Circuit Toshifumi NAKATANI Koichi OGAWA
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2008/06/01 Vol. E91-C No. 6 pp. 844-853 Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies) Category: Keyword: 3rd order intermodulation, noise figure, differential amplifier, 2-tone difference frequency, even- and odd-mode impedance difference, input bias circuit, 3rd generation long term evolution,
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A Variable Phase Shifter Using a Movable Waffle Iron Metal Plate and Its Applications to Phased Array Antennas Hideki KIRINO Koichi OGAWA Takeshi OHNO
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2008/06/01 Vol. E91-B No. 6 pp. 1773-1782 Type of Manuscript: Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation) Category: Antennas Keyword: waffle iron, PMC (Perfect Magnetic Conductor), phase shifter, phased array antenna, vehicle radar,
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Empirical Investigation of the LOS Propagation Characteristics on an Undulating Road for Millimeter Wave Inter-Vehicle Communication Atsushi YAMAMOTO Koichi OGAWA Hiroshi SHIRAI
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2007/09/01 Vol. E90-C No. 9 pp. 1807-1815 Type of Manuscript: Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology) Category: Antennas/Systems Keyword: ITS, inter-vehicle communications, LOS, road undulation,
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IM3 Cancellation Method Using Current Feedback Suitable for a Multi-Stage RFIC Amplifier Toshifumi NAKATANI Koichi OGAWA
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2007/06/01 Vol. E90-C No. 6 pp. 1209-1221 Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies) Category: Keyword: feedback amplifier, 3rd order Intermodulation distortion, IM3 cancellation technique, IM3 phase, integrated circuit design, Volterra series, load-pull measurement, 2nd order non-linearity,
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Simple Modeling of an Abdomen of Pregnant Women and Its Application to SAR Estimation Hiroki KAWAI Koichi ITO Masaharu TAKAHASHI Kazuyuki SAITO Takuya UEDA Masayoshi SAITO Hisao ITO Hisao OSADA Yoshio KOYANAGI Koichi OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2006/12/01 Vol. E89-B No. 12 pp. 3401-3410 Type of Manuscript: PAPER Category: Electromagnetic Compatibility(EMC) Keyword: fetus, pregnant women, amniotic fluid, SAR, FDTD method,
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Attenuation Characteristics of the SAR in a COST244 Phantom with Different EM Source Locations and Sizes Shoichi KAJIWARA Atsushi YAMAMOTO Koichi OGAWA Akihiro OZAKI Yoshio KOYANAGI
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2005/06/01 Vol. E88-B No. 6 pp. 2391-2400 Type of Manuscript: Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation) Category: Keyword: SAR, attenuation characteristic, COST244 phantom, lossy medium, spatial spread of energy,
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A Simple Method for the Measurement of the Phase and Power of 3rd-Order Inter-Modulation Components of the Output of Multi-Stage Power Amplifiers Toshifumi NAKATANI Toru MATSUURA Koichi OGAWA
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2004/05/01 Vol. E87-C No. 5 pp. 749-761 Type of Manuscript: Special Section PAPER (Special Section on Advances in Characterization and Measurement Technologies for Microwave and Millimeter-Wave Materials, Devices and Circuits) Category: Active Devices and Circuits Keyword: 3rd-order inter-modulation distortion, phase of IM3 signal, dissipation power, vector signal analyzer, multi-stage cascaded power amplifier, Volterra series, asymmetry of IM3 sidebands,
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A Three-Mode Switched-LNA Using a Low Parasitic Capacitance MOSFET Switch Toshifumi NAKATANI Koichi OGAWA Junji ITOH Ikuo IMANISHI
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2003/06/01 Vol. E86-C No. 6 pp. 1032-1040 Type of Manuscript: Special Section PAPER (Special Issue on Devices and Circuits for Next Generation Multi-Media Communication Systems) Category: Keyword: low noise amplifier, noise figure, MOSFET switch, parasitic capacitance, 3rd-order intercept point, dissipation power, cross-modulation,
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Proposal for a Slot Pair Array Having an Invariant Main Beam Direction with a Cosecant Radiation Pattern Using a Post-Wall Waveguide Takeshi OHNO Koichi OGAWA Toshihiro TERAOKA Jiro HIROKAWA
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2003/02/01 Vol. E86-C No. 2 pp. 176-183 Type of Manuscript: Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication) Category: Antenna (Slot) Keyword: FWA, main beam direction, traveling wave, cosecant radiation pattern, Talor radiation pattern,
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An Excellent Cost-Performance Antenna Duplexer for 26 GHz FWA Systems Toshio ISHIZAKI Toshihiro TERAOKA Koichi OGAWA
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 2001/10/01 Vol. E84-C No. 10 pp. 1515-1520 Type of Manuscript: Special Section PAPER (Special Issue on Millimeter-Wave Circuits and Fabrication Technologies Opening up the 21st Century) Category: Keyword: FWA, duplexer, E-plane filter, circulator, waveguide,
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A Low-Profile Bi-Directional Cavity Antenna with Broadband Impedance Characteristics Atsushi YAMAMOTO Hiroshi IWAI Toshimitsu MATSUYOSHI Koichi OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2001/09/01 Vol. E84-B No. 9 pp. 2490-2497 Type of Manuscript: Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems) Category: Mobile Antennas Keyword: bi-directional radiation pattern, cavity antenna, IMT-2000, picocell base station,
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Introduction of a Narrower HPBW BS Antenna to Millimetre Wave P-MP FWA Systems: Performance Validation in Terms of C/N, C/I and the Visibility Hiroshi KANNO Toshihiro TERAOKA Toshio ISHIZAKI Koichi OGAWA
Publication: IEICE TRANSACTIONS on Communications Publication Date: 2001/03/01 Vol. E84-B No. 3 pp. 359-367 Type of Manuscript: Special Section PAPER (Special Issue on Innovative Mobile Communication Technologies at the Dawn of the 21^st Century) Category: Keyword: millimetre-wave, FWA, base station antenna, visibility,
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A Study of a Laminated Band Elimination Filter Comprising Coupled-Line Resonators Using Low Temperature Co-Fired Ceramics Hideyuki MIYAKE Shoichi KITAZAWA Toshio ISHIZAKI Koichi OGAWA Ikuo AWAI
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 1999/07/20 Vol. E82-C No. 7 pp. 1104-1109 Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology) Category: Passive Devices and Circuits Keyword: band elimination filter, coupled-line resonators, laminated filter, LTCC,
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Practical Design Procedure of an Elliptic Function Dual-Mode Cavity Filter Coupled through a Non-zero-Thick Septum Toshio ISHIZAKI Koichi OGAWA Hideyuki MIYAKE
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 1998/06/20 Vol. E81-C No. 6 pp. 916-923 Type of Manuscript: Special Section PAPER (Special Issue on Microwave and Millimeter-Wave Module Technology) Category: Passive Element Keyword: dual-mode, elliptic function filter, coupling aperture, septum, thickness,
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A Beam Tilt Dipole Array Antenna for Indoor Mobile Applications Koichi OGAWA Tomoki UWANO
Publication: IEICE TRANSACTIONS on Electronics Publication Date: 1996/05/20 Vol. E79-C No. 5 pp. 685-692 Type of Manuscript: Special Section PAPER (Special Issue on Microwave Devices for Mobile Communications) Category: Passive Devices Keyword: beam tilt, sector beam, dipole array antenna, indoor base station,
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