Hiroaki MIYASHITA


Accuracy Improvement of Characteristic Basis Function Method by Using Multilevel Approach
Tai TANAKA Yoshio INASAWA Naofumi YONEDA Hiroaki MIYASHITA 
Publication:   
Publication Date: 2018/02/01
Vol. E101-C  No. 2  pp. 96-103
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
characteristic basis function method (CBFM)method of moments (MoM)radar cross section (RCS)singular value decomposition (SVD)
 Summary | Full Text:PDF(4MB)

Statistical Model Using Geometrical-Optical Space Classification: Expansion of Applicable Frequencies to the 5 GHz Band
Takahiro HASHIMOTO Takayuki NAKANISHI Yoshio INASAWA Yasuhiro NISHIOKA Hiroaki MIYASHITA 
Publication:   
Publication Date: 2018/02/01
Vol. E101-C  No. 2  pp. 135-138
Type of Manuscript:  BRIEF PAPER
Category: Electromagnetic Theory
Keyword: 
indoor propagationoffice floorpropagation lossstatistical modelray-tracingspace classification
 Summary | Full Text:PDF(430.3KB)

Simultaneous Optimal Design Method of Primary Radiator and Main Reflector for Shaped Beam Antennas
Takashi TOMURA Michio TAKIKAWA Yoshio INASAWA Hiroaki MIYASHITA 
Publication:   
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 211-218
Type of Manuscript:  Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Realization of Next Generation Wireless Systems)
Category: 
Keyword: 
reflector antennashaped reflectorshaped beammultimode hornoptimization
 Summary | Full Text:PDF(1.4MB)

Improved Primary-Characteristic Basis Function Method Considering Higher-Order Multiple Scattering
Tai TANAKA Yoshio INASAWA Yasuhiro NISHIOKA Hiroaki MIYASHITA 
Publication:   
Publication Date: 2017/01/01
Vol. E100-C  No. 1  pp. 45-51
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
characteristic basis function method (CBFM)radar cross section (RCS)method of moments (MoM)
 Summary | Full Text:PDF(1.2MB)

Element Gain Improvement for Phased Array Antenna Based on Radiation Pattern Reconfigurable Antenna
Takashi MARUYAMA Takashi UESAKA Satoshi YAMAGUCHI Masataka OTSUKA Hiroaki MIYASHITA 
Publication:   
Publication Date: 2017/01/01
Vol. E100-B  No. 1  pp. 148-157
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
phased array antennaradiation pattern reconfigurable antennaYagi-Uda antenna
 Summary | Full Text:PDF(1.9MB)

Extended S-Parameter Method for Measuring Reflection and Mutual Coupling of Multi-Antennas
Takashi YANAGI Toru FUKASAWA Hiroaki MIYASHITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/10/01
Vol. E99-B  No. 10  pp. 2195-2202
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
S-parameter methodmultiport antennasimpedancemutual couplingmeasurement
 Summary | Full Text:PDF(1.3MB)

Novel Beam-Scanning Center-Fed Imaging Reflector Antenna with Elliptical Aperture for Wide Area Observation
Michio TAKIKAWA Yoshio INASAWA Hiroaki MIYASHITA Izuru NAITO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/09/01
Vol. E99-C  No. 9  pp. 1031-1038
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
wide area observationelliptical aperturesmall observation satellitereflector antennasdoubly curved reflectorbeam-scanning functioncenter-fed reflector antenna
 Summary | Full Text:PDF(2MB)

A Novel Directional Coupler Loaded with Feedback Capacitances and Its Applications
Motomi ABE Yukihiro TAHARA Tetsu OWADA Naofumi YONEDA Hiroaki MIYASHITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/01/01
Vol. E99-C  No. 1  pp. 85-94
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
feedback capacitancecoupled linestandem 3-dB couplerstubsrectangular coaxial line8×8 HYB matrix
 Summary | Full Text:PDF(3MB)

Improved Primary Characteristic Basis Function Method for Monostatic Radar Cross Section Analysis of Specific Coordinate Plane
Tai TANAKA Yoshio INASAWA Yasuhiro NISHIOKA Hiroaki MIYASHITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/01/01
Vol. E99-C  No. 1  pp. 28-35
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
characteristic basis function method (CBFM)method of moments (MoM)radar cross section (RCS)
 Summary | Full Text:PDF(1.1MB)

Novel Phased Array-Fed Dual-Reflector Antenna with Different Orthogonal Cross-Section by Imaging Reflector Antenna and Ring-Focus Cassegrain Antenna
Michio TAKIKAWA Yoshio INASAWA Hiroaki MIYASHITA Izuru NAITO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/01/01
Vol. E98-C  No. 1  pp. 8-15
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
Imaging Reflector AntennaRing-focus Cassegrain AntennaDoubly Curved ReflectorPhased Array-fed Reflector AntennaBeam-Scanning FunctionCenter-Fed Reflector Antenna
 Summary | Full Text:PDF(2.3MB)

M-Shaped Dielectric Phase Shifter for Beam-Steerable Base-Station Antenna
Kengo NISHIMOTO Takeshi OSHIMA Toru FUKASAWA Hiroaki MIYASHITA Yoshihiko KONISHI Manabu KURIHARA Yoshiyuki CHATANI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/08/01
Vol. E96-B  No. 8  pp. 2095-2101
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
phase shifterdielectricM-shapedbase-station antenna
 Summary | Full Text:PDF(2.2MB)

Inclined Slot Array Antennas on a Hollow Rectangular Coaxial Line
Satoshi YAMAGUCHI Yukihiro TAHARA Toru TAKAHASHI Kazushi NISHIZAWA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/09/01
Vol. E95-B  No. 9  pp. 2870-2877
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
rectangular coaxial linewaveguideslot array antennainclined linear polarization
 Summary | Full Text:PDF(2.7MB)

Acceleration of Flexible GMRES Using Fast Multipole Method for Implementation Based on Combined Tangential Formulation
Hidetoshi CHIBA Toru FUKASAWA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1661-1668
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
flexible GMRESintegral equation methodsmethod of momentscombined tangential formulationPMCHWTfast multipole methodmultilevel fast multipole algorithm
 Summary | Full Text:PDF(2.1MB)

Convergence Property of IDR(s) Method Implemented along with Method of Moments for Solving Large-Scale Electromagnetic Scattering Problems Involving Conducting Objects
Hidetoshi CHIBA Toru FUKASAWA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/02/01
Vol. E94-C  No. 2  pp. 198-205
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
IDR(s) methodKrylov subspace methodsintegral equation methodsmethod of momentsmultilevel fast multipole algorithm
 Summary | Full Text:PDF(1.3MB)

Efficient Implementation of Inner-Outer Flexible GMRES for the Method of Moments Based on a Volume-Surface Integral Equation
Hidetoshi CHIBA Toru FUKASAWA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/01/01
Vol. E94-C  No. 1  pp. 24-31
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: Numerical Techniques
Keyword: 
flexible GMRESintegral equation methodsmethod of momentsmultilevel fast multipole algorithmKrylov subspace methods
 Summary | Full Text:PDF(1.5MB)

Ultra-Wideband Tapered Slot Antenna Arrays with Parallel-Plate Waveguides
Satoshi YAMAGUCHI Hiroaki MIYASHITA Toru TAKAHASHI Masataka OTSUKA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/05/01
Vol. E93-B  No. 5  pp. 1248-1255
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
tapered slot antennaparallel-plate waveguideswideband antennaarray antennaFDTD
 Summary | Full Text:PDF(1.3MB)

Construction and Design Equations of a Lumped Element Dual-Band Wilkinson Divider
Takeshi OSHIMA Masataka OHTSUKA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/10/01
Vol. E92-C  No. 10  pp. 1322-1324
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
microwavedual-bandWilkinson dividerlumped elementcompact
 Summary | Full Text:PDF(200.5KB)

Using Conducting Wire at A-Sandwich Junctions to Improve the Transmission Performance of Radomes
Yoshio INASAWA Toshio NISHIMURA Jun TSURUTA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/08/01
Vol. E91-B  No. 8  pp. 2764-2767
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
A-sandwichradometransmission performancejunctionconducting wire
 Summary | Full Text:PDF(286.1KB)

RCS Prediction Method from One-Dimensional Intensity Data in Near-Field
Yoshio INASAWA Hiroaki MIYASHITA Yoshihiko KONISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/07/01
Vol. E91-C  No. 7  pp. 1167-1170
Type of Manuscript:  LETTER
Category: Electromagnetic Theory
Keyword: 
RCSnear-field to far-field transformationphase retrievalnear-fieldphaseless
 Summary | Full Text:PDF(353.1KB)

Wave Analysis of the Aperture Field Distribution in Probe-Fed Radial Line Planar Antennas
Nobuyasu TAKEMURA Hiroaki MIYASHITA Shigeru MAKINO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2006/09/01
Vol. E89-B  No. 9  pp. 2580-2587
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
array antennasradial lineprobepostmutual couplingaperture field distributionradial line planar antennaswave analysis
 Summary | Full Text:PDF(649.6KB)

Simple Expression of Antenna Coupling by Using a Product of Radiation Patterns
Hiroaki MIYASHITA Isamu CHIBA Shuji URASAKI Shoichiro FUKAO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/11/25
Vol. E82-B  No. 11  pp. 1867-1873
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
approximate formulafar-field approximationsantenna mutual couplingsmutual impedancesmutual admittancesreaction integralswedge diffractionsGTD
 Summary | Full Text:PDF(699.2KB)

Equivalent Susceptance of a Circular Iris in a Parallel Plate Waveguide
Hiroaki MIYASHITA Isamu CHIBA Shuji URASAKI Shoichiro FUKAO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1999/11/25
Vol. E82-B  No. 11  pp. 1844-1850
Type of Manuscript:  PAPER
Category: Communication Cable and Wave Guides
Keyword: 
iriscircular irisparallel plate waveguideequivalent susceptanceapproximate formula
 Summary | Full Text:PDF(577.7KB)

Far-Field RCS Prediction Method Using Cylindrical or Planar Near-Field RCS Data
Yoshio INASAWA Hiroaki MIYASHITA Isamu CHIBA Shigeru MAKINO Shuji URASAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1997/11/25
Vol. E80-C  No. 11  pp. 1402-1406
Type of Manuscript:  Special Section PAPER (Special Issue on Electromagnetic TheoryScattering and Diffraction)
Category: 
Keyword: 
radar cross sectionnear-field measurementRCSnear-field RCS
 Summary | Full Text:PDF(436.5KB)