Kunio SAWAYA


Historical Review of Research and Development of Linear Antennas in Tohoku University
Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/07/01
Vol. E98-C  No. 7  pp. 616-620
Type of Manuscript:  INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
Yagi-Uda antennaself-complementary antennasloop antenna
 Summary | Full Text:PDF(2.2MB)

Forward-Nulling Passive Millimeter Wave Imaging Using Cooling Dielectric Tube
Hiroyasu SATO Kohei KURIYAMA Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/10/01
Vol. E95-C  No. 10  pp. 1627-1634
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
passive millimeter wave imaging (PMMW)incoherentcooling dielectric tubeparabolic cylindernoise source
 Summary | Full Text:PDF(2.8MB)

Statistical Analysis of Huge-Scale Periodic Array Antenna Including Randomly Distributed Faulty Elements
Keisuke KONNO Qiang CHEN Kunio SAWAYA Toshihiro SEZAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1611-1617
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Microwave and Millimeter-Wave Antennas
Keyword: 
Method of Moments (MoM)impedance extension method (IEM)local admittance compensation (LAC)array antenna
 Summary | Full Text:PDF(1.5MB)

High Gain Antipodal Fermi Antenna with Low Cross Polarization
Hiroyasu SATO Yukiko TAKAGI Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/08/01
Vol. E94-B  No. 8  pp. 2292-2297
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
tapered slot antennaTSAFermi antennabroadband antennaUWB antenna
 Summary | Full Text:PDF(1.5MB)

Numerical Analysis on MIMO Performance of the Modulated Scattering Antenna Array in Indoor Environment
Lin WANG Qiang CHEN Qiaowei YUAN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/06/01
Vol. E94-B  No. 6  pp. 1752-1756
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
array antennamodulationmobile handsetsnonlinear circuitsVolterra seriesMoMMIMO
 Summary | Full Text:PDF(743.6KB)

Ultra-Wideband Array Antenna Utilizing Novel Scanning System with Tapped Delay Lines for Short Range Radar
Fuminori SAKAI Kazuo OHTA Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/05/01
Vol. E94-B  No. 5  pp. 1194-1200
Type of Manuscript:  Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies)
Category: Antennas and Antenna Measurement
Keyword: 
array antennadelay lineimpulsescanning antennaultra-wideband
 Summary | Full Text:PDF(2.1MB)

Quantitative Evaluation for Computational Cost of CG-FMM on Typical Wiregrid Models
Keisuke KONNO Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2611-2618
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Electromagnetic Analysis
Keyword: 
Method of Moments (MoM)conjugate gradientfast multipole method
 Summary | Full Text:PDF(1.2MB)

Three-Dimensional Electromagnetic Scattering Analysis Using Constrained Interpolation Profile Method
Jerdvisanop CHAKAROTHAI Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2619-2628
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Electromagnetic Analysis
Keyword: 
electromagnetic scattering analysisscattering cross sectionCIP methodFDTD methodMie
 Summary | Full Text:PDF(1MB)

Experimental Study on MIMO Performance of Modulated Scattering Antenna Array in Indoor Environment
Lin WANG Qiang CHEN Qiaowei YUAN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/03/01
Vol. E93-B  No. 3  pp. 679-684
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
antennaantenna arraymodulationwireless communicationsmobile handsetMIMO
 Summary | Full Text:PDF(803KB)

Analysis of Huge-Scale Periodic Array Antenna Using Impedance Extension Method
Keisuke KONNO Qiang CHEN Kunio SAWAYA Toshihiro SEZAI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/12/01
Vol. E92-B  No. 12  pp. 3869-3874
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
Method of Moments(MoM)impedance extension methodhuge periodic array antenna
 Summary | Full Text:PDF(680.4KB)

Impedance Analysis of Printed Antenna on Three-Dimensional High-Permittivity Dielectric Substrate Using Mixed-Domain MoM
Amin SAEEDFAR Hiroyasu SATO Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2009/06/01
Vol. E92-B  No. 6  pp. 2352-2355
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
volume integral equationmixed-domain MoMdielectric substrateprinted antennalegendre expansionFDTD method
 Summary | Full Text:PDF(326.6KB)

Accuracy and Stability Enhancement of Hybrid-Domain MoM Solution for Volume Scattering Problems Using Legendre Expansion
Amin SAEEDFAR Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/12/01
Vol. E91-B  No. 12  pp. 4062-4066
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
tensor-volume integral equationhybrid-domain MoMlegendre polynomials
 Summary | Full Text:PDF(248KB)

Current Estimation on Multi-Layer Printed Circuit Board with Lumped Circuits by Near-Field Measurement
Sumito KATO Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Vol. E91-B  No. 11  pp. 3788-3791
Type of Manuscript:  LETTER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
measurementcurrent distributionnear-fieldPCBlumped circuit
 Summary | Full Text:PDF(617.8KB)

Experimental Study on MUSIC-Based DOA Estimation by Using Universal Steering Vector
Qiaowei YUAN Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/05/01
Vol. E91-B  No. 5  pp. 1575-1580
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MUSICdirection of arrivalarray antennaarray element patternmutual couplingsteering vectorMoM
 Summary | Full Text:PDF(372.3KB)

Numerical and Experimental Impedance Analyses of Dipole Antenna in the Vicinity of Deionized Water at Different Temperatures
Amin SAEEDFAR Hiroyasu SATO Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/03/01
Vol. E91-B  No. 3  pp. 963-967
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
tensor-volume integral equationPocklington's integral equationmixed-domain MoMhigh-permittivity scatterersFDTD method
 Summary | Full Text:PDF(961KB)

Numerical Investigation of Channel Capacity of Indoor MIMO System
Xiao Peng YANG Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2338-2343
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Propagation
Keyword: 
MIMOchannel capacityindoor channelhybrid methodsreflection coefficienteffective multipaths
 Summary | Full Text:PDF(459.2KB)

SAR Investigation of Array Antennas for Mobile Handsets
Qiang CHEN Yasunori KOMUKAI Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/06/01
Vol. E90-B  No. 6  pp. 1354-1356
Type of Manuscript:  Special Section LETTER (Special Section on 2nd Pan-Pacific EMC Joint Meeting--PPEMC'06--)
Category: 
Keyword: 
antennasarraysmobile antennasmobile communicationSARbiological effects of electromagnetic radiation
 Summary | Full Text:PDF(382KB)

Investigation of Wall Effect on Indoor MIMO Channel Capacity by Using MoM-FDTD Hybrid Technique
Xiao Peng YANG Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/05/01
Vol. E90-B  No. 5  pp. 1201-1207
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MIMOchannel capacityhybrid methodMoMFDTDRicean K factoreffective degrees of freedom (EDOF)
 Summary | Full Text:PDF(483.5KB)

Effects of Wall Reflection on Indoor MIMO Channel Capacity
Xiao Peng YANG Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/03/01
Vol. E90-B  No. 3  pp. 704-706
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
MIMOchannel capacityindoor channelhybrid methodreflection coefficient
 Summary | Full Text:PDF(143.8KB)

Improved Solution of Tensor-Volume Integral Equation Using Mixed-Domain MoM with Polynomial Expansion
Amin SAEEDFAR Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/03/01
Vol. E90-B  No. 3  pp. 607-620
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
Tensor-Volume Integral Equationmixed-domain MoMdielectric scattererthin-wire antennapolynomial expansion
 Summary | Full Text:PDF(1.1MB)

Preconditioners for CG-FMM-FFT Implementation in EM Analysis of Large-Scale Periodic Array Antennas
Huiqing ZHAI Qiaowei YUAN Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/03/01
Vol. E90-B  No. 3  pp. 707-710
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
large-scale periodic array antennamethod of moments (MoM)fast multipole method (FMM)fast Fourier transform (FFT)preconditioner
 Summary | Full Text:PDF(114KB)

Numerical Analysis of Wall Material Effect on Indoor MIMO Channel Capacity
Xiao Peng YANG Qiang CHEN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/10/01
Vol. E89-B  No. 10  pp. 2949-2951
Type of Manuscript:  LETTER
Category: Wireless Communication Technologies
Keyword: 
MIMOchannel capacityindoor channelhybrid methodRicean K factoreffective degrees of freedom (EDOF)
 Summary | Full Text:PDF(127.2KB)

Analysis of Large-Scale Periodic Array Antennas by CG-FFT Combined with Equivalent Sub-Array Preconditioner
Huiqing ZHAI Qiang CHEN Qiaowei YUAN Kunio SAWAYA Changhong LIANG 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/03/01
Vol. E89-B  No. 3  pp. 922-928
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
large-scale periodic phased arraysmethod of moments (MoM)block Toeplitz matricesconjugate-gradient fast Fourier transform (CG-FFT)preconditioner of iterative method
 Summary | Full Text:PDF(624.3KB)

Estimation of Short Range Multiple Coherent Source Location by Using MUSIC Algorithm
Takashi KATO Kazumasa TAIRA Kunio SAWAYA Risaburo SATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/08/01
Vol. E88-B  No. 8  pp. 3317-3320
Type of Manuscript:  Special Section LETTER (Special Section of 2004 International Symposium on Electromagnetic Compatibility)
Category: 
Keyword: 
MUSIC algorithmestimation of source locationdirection of arrivalmultiple coherent sources
 Summary | Full Text:PDF(1.1MB)

Experimental Study on Compensation of Array Element Pattern of Collinear Dipole Array Sensor
Kyosuke AWAI Kazumasa TAIRA Kunio SAWAYA Risaburo SATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/08/01
Vol. E88-B  No. 8  pp. 3314-3316
Type of Manuscript:  Special Section LETTER (Special Section of 2004 International Symposium on Electromagnetic Compatibility)
Category: 
Keyword: 
array sensorarray element patternmutual couplingcompensation factorestimation of electromagnetic source location
 Summary | Full Text:PDF(637.3KB)

Estimation of Multiple Coherent Source Locations by Using SPM Method Combined with Signal Subspace Fitting Technique
Yuzo YOSHIMOTO Kazumasa TAIRA Kunio SAWAYA Risaburo SATO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/08/01
Vol. E88-B  No. 8  pp. 3164-3169
Type of Manuscript:  Special Section PAPER (Special Section of 2004 International Symposium on Electromagnetic Compatibility)
Category: Measurements
Keyword: 
EMCelectric fieldSPM methodWSF methodcalibrationestimation of electromagnetic source location
 Summary | Full Text:PDF(503.7KB)

Series-Fed Beam-Scanning Antenna Employing Multi-Stage Configured Microstrip Antennas with Tunable Reactance Devices
Naoki HONMA Tomohiro SEKI Kenjiro NISHIKAWA Koichi TSUNEKAWA Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Vol. E88-B  No. 6  pp. 2297-2304
Type of Manuscript:  Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
tunable reactance devicemicrostrip antennabeam scanningmulti-stagetraveling wave
 Summary | Full Text:PDF(925.6KB)

Convergence of SOR in MoM Analysis of Array Antenna
Qiang CHEN Qiaowei YUAN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/05/01
Vol. E88-B  No. 5  pp. 2220-2223
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
antennaarray antennasmethod of momentsmatrix equationSORiterative method
 Summary | Full Text:PDF(138.8KB)

Antenna Design by Using Method of Moments
Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/05/01
Vol. E88-B  No. 5  pp. 1766-1773
Type of Manuscript:  INVITED PAPER (Special Section on Recent Progress in Antennas and Propagation Researches--Selected Papers Translated from the IEICE Transactions on Communications (Japanese Edition)--)
Category: 
Keyword: 
method of momentselectromagnetic fieldantennanumerical analysisscattering
 Summary | Full Text:PDF(566.9KB)

Reduction of the Induction Field on Overhead Transmission Lines Caused by Resonance with an MF Broadcast Wave by Using the Method of Selecting Grounding Points
Takayuki SASAMORI Teruo TOBANA Kohshi ABE Kunio SAWAYA Saburo ADACHI Kohji ARITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/09/01
Vol. E86-B  No. 9  pp. 2745-2752
Type of Manuscript:  PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
MF radio induction on grounded power lineEMImethod of moments
 Summary | Full Text:PDF(580.7KB)

FOREWORD
Kunio SAWAYA Takayasu SHIOKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/03/01
Vol. E86-B  No. 3  pp. 891-891
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(72.6KB)

Review of Research and Development on Linear Antennas
Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/03/01
Vol. E86-B  No. 3  pp. 892-899
Type of Manuscript:  INVITED PAPER (Special Issue on Historical Review of Antenna Systems in Japan)
Category: 
Keyword: 
Yagi-Uda antennaself-complementary antennaloop antennaspiral antennahelical antenna
 Summary | Full Text:PDF(2.8MB)

Accurate Source Model for MoM Analysis of Linear Antennas by Using Sinusoidal Reaction Matching Technique
Qiang CHEN Qiaowei YUAN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/02/01
Vol. E86-B  No. 2  pp. 870-872
Type of Manuscript:  LETTER
Category: Antenna and Propagation
Keyword: 
method of momentsource modelfeedlinear antenna
 Summary | Full Text:PDF(201.7KB)

Fast Algorithm for Solving Matrix Equation in MoM Analysis of Large-Scale Array Antennas
Qiang CHEN Qiaowei YUAN Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2002/11/01
Vol. E85-B  No. 11  pp. 2482-2488
Type of Manuscript:  PAPER
Category: Antenna and Propagation
Keyword: 
antennaantenna arraymoment methodmatrix equationiterative method
 Summary | Full Text:PDF(891.5KB)

Numerical Techniques for Analysis of Electromagnetic Problems
Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2000/03/25
Vol. E83-B  No. 3  pp. 444-452
Type of Manuscript:  INVITED PAPER (Special Issue on Recent Progress in Electromagnetic Compatibility Technology)
Category: 
Keyword: 
method of momentthin wire approximationwire/surface junctiondielectric bodyfinite difference time domain methoddispersive mediumabsorbing boundary condition
 Summary | Full Text:PDF(777.6KB)

Measurement of Power Absorption by Human Model in the Vicinity of Antennas
Qiang CHEN Takayuki SHINOHE Kazuhisa IGARI Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/05/25
Vol. E80-B  No. 5  pp. 709-711
Type of Manuscript:  Special Section LETTER (Special Issue on EMC/EMI Problems in Microwave Frequency Range)
Category: 
Keyword: 
absorption of electromagnetic powerradiation efficiencyantennameasurementEMC
 Summary | Full Text:PDF(175.2KB)

FOREWORD
Yoji NAGASAWA Kunio SAWAYA Yoshio KAMI Kohji KOSHIJI Youji KOTSUKA Takashi SHINOZUKA Masao TAKI Toshio NOJIMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1997/05/25
Vol. E80-B  No. 5  pp. 643-644
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(195.6KB)

Relationship between SAR of Eyeball and Position of Feeding Point of MRI Antenna
Hisaaki OCHI Etsuji YAMAMOTO Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/06/25
Vol. E78-B  No. 6  pp. 859-861
Type of Manuscript:  Special Section LETTER (Special Issue on Medical Applications of Electromagnetic Techniques)
Category: 
Keyword: 
MRI antennarealistic head modelSARsensitivity
 Summary | Full Text:PDF(212.1KB)

FOREWORD
Kunio SAWAYA Koichi ITO Fujio AMEMIYA Kazuhiro IINUMA Takuro KISHIMOTO Koichi SHIMIZU Itsuo YAMAURA Toshio WAKABAYASHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1995/06/25
Vol. E78-B  No. 6  pp. 787-788
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(239.9KB)

A Method for Measuring Surface Impedance of Superconductor and Dielectric Characteristics of Substrate by Using Strip Line Resonator
Akira TAKETOMI Kunio SAWAYA Saburo ADACHI Shigetoshi OHSHIMA Norihiko YAOI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1994/08/25
Vol. E77-C  No. 8  pp. 1234-1241
Type of Manuscript:  Special Section PAPER (Special Section on Superconducting Devices)
Category: HTS
Keyword: 
surface impedancemicrostrip line resonatordielectric constantloss tangent
 Summary | Full Text:PDF(611.4KB)

Effect of Dimension of Conducting Box on Radiation Pattern of a Monopole Antenna for Portable Telephone
Ryo YAMAGUCHI Kunio SAWAYA Yoshiyuki FUJINO Saburo ADACHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/12/25
Vol. E76-B  No. 12  pp. 1526-1531
Type of Manuscript:  Special Section PAPER (Special Issue on 1992 Internatioal Symposium on Antennas and Propagation)
Category: 
Keyword: 
mobile communicationportable telephoneGalerkin-moment methodFourier series expansionmonopole antenna
 Summary | Full Text:PDF(441.4KB)

Analysis of MRI Slotted Tube Resonator Having a Shield of Conducting Circular Cylinder
Qiang CHEN Kunio SAWAYA Saburo ADACHI Hisaaki OCHI Etsuji YAMAMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1993/05/25
Vol. E76-B  No. 5  pp. 553-560
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
MRINMRslotted tube resonatorshieldantennaprobe
 Summary | Full Text:PDF(608.8KB)

FOREWORD
Kenichi KAGOSHIMA Takayasu SHIOKAWA Masaharu FUJITA Kunio SAWAYA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1991/10/25
Vol. E74-B  No. 10  pp. 3189-3190
Type of Manuscript:  FOREWORD
Category: 
Keyword: 
 Summary | Full Text:PDF(211.4KB)