Hiroshi HIRAYAMA


An Investigation on Self-Resonant and Capacitor-Loaded Helical Antennas for Coupled-Resonant Wireless Power Transfer
Hiroshi HIRAYAMA Tomohiro AMANO Nobuyoshi KIKUMA Kunio SAKAKIBARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2431-2439
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2012)
Category: Antennas
Keyword: 
wireless power transfercoupled resonanthelical antennaself resonance
 Summary | Full Text:PDF(3.6MB)

Automated Creation of Beamformer-Based Optimum DOA Estimation Algorithm Using Genetic Algorithm
Shunsuke YOSHIMURA Hiroshi HIRAYAMA Nobuyoshi KIKUMA Kunio SAKAKIBARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/10/01
Vol. E95-B  No. 10  pp. 3332-3336
Type of Manuscript:  LETTER
Category: Antennas and Propagation
Keyword: 
array antennaDOA estimationgenetic algorithmgenetic programmingPolish notationcombinatorial optimization
 Summary | Full Text:PDF(921.9KB)

Broadband Millimeter-Wave Microstrip Comb-Line Antenna Using Corporate Feeding System with Center-Connecting
Atsushi KUNITA Kunio SAKAKIBARA Kazuyuki SEO Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/01/01
Vol. E95-B  No. 1  pp. 41-50
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2010)
Category: Antennas
Keyword: 
millimeter-wavemicrostrip antennaarray antenna
 Summary | Full Text:PDF(2.1MB)

Millimeter-Wave Microstrip-Line-Fed Broadband Waveguide Aperture Antennas
Shintaro YANO Kunio SAKAKIBARA Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2012/01/01
Vol. E95-B  No. 1  pp. 34-40
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Antennas and Propagation in Conjunction with Main Topics of ISAP2010)
Category: Antennas
Keyword: 
Millimeter-Wave AntennaWaveguideLTCC substrate
 Summary | Full Text:PDF(1.4MB)

Channel Capacity Improvement in Short-Range MIMO Using Side and Back Reflectors
Hiroshi HIRAYAMA Gen MATSUI Nobuyoshi KIKUMA Kunio SAKAKIBARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2011/05/01
Vol. E94-B  No. 5  pp. 1280-1283
Type of Manuscript:  Special Section LETTER (Special Section on Antenna and Propagation Technologies Contributing to Diversification of Wireless Technologies)
Category: Antennas
Keyword: 
short-range MIMOFDTDeigen value distributionMIMO antenna
 Summary | Full Text:PDF(692.7KB)

A New Scheme to Avoid Null Zone for HF-Band RFID with Diversity Combining of Loop Antennas
Hiroshi HIRAYAMA Nobuyoshi KIKUMA Kunio SAKAKIBARA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2666-2669
Type of Manuscript:  Special Section LETTER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
Keyword: 
RFIDselective diversityloop antennawireless power feeding
 Summary | Full Text:PDF(651.8KB)

Narrow-Wall-Slotted Hollow-Waveguide Array Antenna Using Partially Parallel Feeding System in Millimeter-Wave Band
Yuki IKENO Kunio SAKAKIBARA Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2545-2553
Type of Manuscript:  Special Section PAPER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
Keyword: 
millimeter-wave antennawaveguidefeeding circuitarray antenna
 Summary | Full Text:PDF(1.7MB)

Control of Power Dividing Ratio in Four-Way Power Divider for Feeding Microstrip Comb-Line Antenna
Morihiko NANJO Kunio SAKAKIBARA Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2010/10/01
Vol. E93-B  No. 10  pp. 2651-2654
Type of Manuscript:  Special Section LETTER (Special Section on Advanced Technologies in Antennas and Propagation in Conjunction with Main Topics of ISAP2009)
Category: Antennas
Keyword: 
millimeter-wavearray antennamicrostrip antennacomb-line antenna
 Summary | Full Text:PDF(524.8KB)

An Estimation Method of Poynting Vector with Near-Magnetic-Field Measurement
Hiroshi HIRAYAMA Nobuyoshi KIKUMA Kunio SAKAKIBARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/01/01
Vol. E93-C  No. 1  pp. 66-73
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Electromagnetic Theory and Its Application)
Category: 
Keyword: 
electro-magnetic interferencenear-field measurementshielded loop probepoynting vectoryee cell
 Summary | Full Text:PDF(861KB)

Broadband Planar Antenna Combining Monopole Element with Electromagnetic Bandgap
Kazuoki MATSUGATANI Kunio SAKAKIBARA Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/11/01
Vol. E91-C  No. 11  pp. 1778-1785
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
antennaEBGmonopoleplanarmicrowave
 Summary | Full Text:PDF(990.7KB)

Design and Optimization of Millimeter-Wave Microstrip-to-Waveguide Transition Operating over Broad Frequency Bandwidth
Yusuke DEGUCHI Kunio SAKAKIBARA Nobuyoshi KIKUMA Hiroshi HIRAYAMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/01/01
Vol. E90-C  No. 1  pp. 157-164
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
millimeter wave technologymillimeter wave circuitsmicrostrip circuitswaveguides
 Summary | Full Text:PDF(1MB)

An Imaging System for Electro-Magnetic Noise Source Identification
Hiroshi HIRAYAMA Yoshio KAMI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2003/04/01
Vol. E86-B  No. 4  pp. 1377-1382
Type of Manuscript:  PAPER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
microwave imagingmicrowave holographyinverse Fresnel transform
 Summary | Full Text:PDF(771.8KB)

An Imaging System for EM Emitting Sources Using a Six-Port Interferometer
Hiroshi HIRAYAMA Toshiyuki YAKABE Yoshio KAMI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2001/12/01
Vol. E84-C  No. 12  pp. 1885-1891
Type of Manuscript:  Special Section PAPER (Special Issue on New Technologies in Signal Processing for Electromagnetic-wave Sensing and Imaging)
Category: 
Keyword: 
microwave imagingmicrowave holographysix-port interferometerEMC
 Summary | Full Text:PDF(1MB)