Yoshio KOYANAGI

A Study on Decoupling Method for Two PIFAs Using Parasitic Elements and Bridge Line
Quang Quan PHUNG Tuan Hung NGUYEN Naobumi MICHISHITA Hiroshi SATO Yoshio KOYANAGI Hisashi MORISHITA 
Publication:   
Publication Date: 2021/06/01
Vol. E104-B  No. 6  pp. 630-638
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
PIFAs, parasitic elements, bridge line, decoupling, 
 Summary | Full Text:PDF
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-band, inverted-F antenna, small antenna, handset antenna, low-profile, infinite ground plane, 
 Summary | Full Text:PDF
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 volume, space-saving design, handset antenna, inverted-F antenna, 
 Summary | Full Text:PDF
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 terminal, folded monopole, multiple-input multiple-output (MIMO), correlation coefficient, mean effective gain (MEG), 
 Summary | Full Text:PDF
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 antenna, tilted beam, electromagnetic band-gap(EBG) reflector, slot antenna, 
 Summary | Full Text:PDF
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, 
 Summary | Full Text:PDF
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, 
 Summary | Full Text:PDF
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 antenna, folded monopole antenna, low profile, small size, 
 Summary | Full Text:PDF
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 antenna, handset, design concept, balanced system, body effect, 
 Summary | Full Text:PDF