Yoshio KOYANAGI


Investigation on a Multi-Band Inverted-F Antenna Sharing Only One Shorting Strip among Multiple Branch Elements
Tuan Hung NGUYEN Takashi OKI Hiroshi SATO Yoshio KOYANAGI Hisashi MORISHITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2015/07/01
Vol. E98-B  No. 7  pp. 1302-1315
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
multi-bandinverted-F antennasmall antennahandset antennalow-profileinfinite ground plane
 Summary | Full Text:PDF(3.9MB)

A Study on Minimization of Requisite Design Volume of Small Antennas Inside Handset Terminals
Tuan Hung NGUYEN Hiroshi SATO Yoshio KOYANAGI Hisashi MORISHITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/11/01
Vol. E97-B  No. 11  pp. 2395-2403
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
requisite design volumespace-saving designhandset antennainverted-F antenna
 Summary | Full Text:PDF(2.4MB)

Compact Built-In Handset MIMO Antenna Using L-Shaped Folded Monopole Antennas
Yongho KIM Toshiteru HAYASHI Yoshio KOYANAGI Hisashi MORISHITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2008/06/01
Vol. E91-B  No. 6  pp. 1743-1751
Type of Manuscript:  Special Section PAPER (Special Section on 2007 International Symposium on Antennas and Propagation)
Category: Smart Antennas & MIMO
Keyword: 
handset terminalfolded monopolemultiple-input multiple-output (MIMO)correlation coefficientmean effective gain (MEG)
 Summary | Full Text:PDF(1.9MB)

Switched-Beam Slot Antenna over Electromagnetic Band-Gap Reflector
Hiroyuki UNO Yutaka SAITO Yoshio KOYANAGI Satoshi YAGITANI Isamu NAGANO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/09/01
Vol. E90-B  No. 9  pp. 2263-2270
Type of Manuscript:  Special Section PAPER (Special Section on 2006 International Symposium on Antennas and Propagation)
Category: Antennas
Keyword: 
switched-beam antennatilted beamelectromagnetic band-gap(EBG) reflectorslot antenna
 Summary | Full Text:PDF(1.3MB)

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: 
fetuspregnant womenamniotic fluidSARFDTD method
 Summary | Full Text:PDF(1MB)

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: 
SARattenuation characteristicCOST244 phantomlossy mediumspatial spread of energy
 Summary | Full Text:PDF(1.9MB)

Characteristics of Built-In Folded Monopole Antenna for Handsets
Shogo HAYASHIDA Tomoki TANAKA Hisashi MORISHITA Yoshio KOYANAGI Kyohei FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2005/06/01
Vol. E88-B  No. 6  pp. 2275-2283
Type of Manuscript:  Special Section PAPER (Special Section on 2004 International Symposium on Antennas and Propagation)
Category: 
Keyword: 
handset antennafolded monopole antennalow profilesmall size
 Summary | Full Text:PDF(804.1KB)

A Folded Loop Antenna System for Handsets Developed and Based on the Advanced Design Concept
Yongho KIM Hisashi MORISHITA Yoshio KOYANAGI Kyohei FUJIMOTO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2001/09/01
Vol. E84-B  No. 9  pp. 2468-2475
Type of Manuscript:  Special Section PAPER (Special Issue on Innovation in Antennas and Propagation for Expanding Radio Systems)
Category: Mobile Antennas
Keyword: 
small antennahandsetdesign conceptbalanced systembody effect
 Summary | Full Text:PDF(1.2MB)