Ryo ISHIKAWA

Pattern Synthesis of Spatial Eigenmodes Exploiting Spherical Conformal Array
Akira SAITOU Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   
Publication Date: 2022/10/01
Vol. E105-B  No. 10  pp. 1231-1239
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
pattern synthesis, eigenmode, spherical conformal array, numerical calculation, 
 Summary | Full Text:PDF
Doherty Amplifier Design Based on Asymmetric Configuration Scheme
Ryo ISHIKAWA Yoichiro TAKAYAMA Kazuhiko HONJO 
Publication:   
Publication Date: 2021/10/01
Vol. E104-C  No. 10  pp. 496-505
Type of Manuscript:  INVITED PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
wireless communication, doherty power amplifier, asymmetric configuration, GaN HEMT MMIC, 
 Summary | Full Text:PDF
High Performance OAM Communication Exploiting Port-Azimuth Effect of Loop Antennas
Hiroto OTSUKA Ryohei YAMAGISHI Akira SAITOU Hiroshi SUZUKI Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   
Publication Date: 2019/12/01
Vol. E102-B  No. 12  pp. 2267-2275
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
loop antenna, orbital angular momentum, multiplexing, 
 Summary | Full Text:PDF
Class-F GaN HEMT Amplifiers Using Compact CRLH Harmonic Tuning Stubs Designed Based on Negative Order Resonance Modes
Shinichi TANAKA Sota KOIZUMI Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   
Publication Date: 2019/10/01
Vol. E102-C  No. 10  pp. 691-698
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
left-handed metamaterials, power amplifier, 
 Summary | Full Text:PDF
4.5-/4.9-GHz-Band Selective High-Efficiency GaN HEMT Power Amplifier by Characteristic Impedance Switching
Kazuki MASHIMO Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   
Publication Date: 2018/10/01
Vol. E101-C  No. 10  pp. 751-758
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
power amplifier, high efficiency, band selective, GaN HEMT, PIN diode, 
 Summary | Full Text:PDF
83nJ/bit Transmitter Using Code-Modulated Synchronized-OOK on 65nm SOTB for Normally-Off Wireless Sensor Networks
Van-Trung NGUYEN Ryo ISHIKAWA Koichiro ISHIBASHI 
Publication:   
Publication Date: 2018/07/01
Vol. E101-C  No. 7  pp. 472-479
Type of Manuscript:  Special Section PAPER (Special Section on Analog Circuits and Their Application Technologies)
Category: 
Keyword: 
wireless sensor networks, Code Modulation, synchronous-OOK, SOTB, 
 Summary | Full Text:PDF
Experimental Design Method for High-Efficiency Microwave Power Amplifiers Based on a Low-Frequency Active Harmonic Load-Pull Technique
Ryo ISHIKAWA Yoichiro TAKAYAMA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/10/01
Vol. E99-C  No. 10  pp. 1147-1155
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
high efficiency, power amplifier, active load-pull, harmonic tuning, 
 Summary | Full Text:PDF
Miniature Design Technique of Stabilized C-Band p-HEMT MMIC Doherty Power Amplifier with Lumped Element Load Modulator
Tsuyoshi YOSHIDA Yoichiro TAKAYAMA Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/10/01
Vol. E99-C  No. 10  pp. 1130-1139
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
doherty amplifier, microwave, power amplifier, GaAs HEMT, series connected load type, MMIC, broadband, 
 Summary | Full Text:PDF
Miniaturization of Double Stub Resonators Using Lumped-Element Capacitors for MMIC Applications
Shinichi TANAKA Takao KATAYOSE Hiroki NISHIZAWA Ken'ichi HOSOYA Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2016/07/01
Vol. E99-C  No. 7  pp. 830-836
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
resonator, Q-factor, microstrip line, coplanar waveguide, MMIC, oscillators, phase noise, 
 Summary | Full Text:PDF
Novel Design of Dual-Band Reconfigurable Dipole Antenna Using Lumped and Distributed Elements
Shoichi ONODERA Ryo ISHIKAWA Akira SAITOU Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2016/07/01
Vol. E99-B  No. 7  pp. 1550-1557
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
reconfigurable antennas, dipole antennas, equivalent circuit, dual-band antenna, varactors, multipole expansion, 
 Summary | Full Text:PDF
Digital Spatial Modulation Using Dual Scatterers Embedded with Switches for Wireless Power Transmission Applications
Kohei HASEGAWA Ryo ISHIKAWA Akira SAITOU Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/07/01
Vol. E98-C  No. 7  pp. 709-715
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Scattering and Diffraction
Keyword: 
modulation, power transmission, amplitude-shift keying, scatterer, 
 Summary | Full Text:PDF
A High-Efficiency Low-Distortion Cascode Power Amplifier Consisting of Independently Biased InGaP/GaAs HBTs
Yuki TAKAGI Yoichiro TAKAYAMA Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/01/01
Vol. E97-C  No. 1  pp. 58-64
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
cascode, InGaP/GaAs HBT, microwave power amplifier, 
 Summary | Full Text:PDF
Spatially Modulated Communication Method Using Dual Scatterers Embedded with Lumped Elements for Wireless Power Transmission
Akira SAITOU Kohei HASEGAWA Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2013/10/01
Vol. E96-B  No. 10  pp. 2425-2430
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 transmission, scatterer, lumped element, modulation factor, mutual impedance, 
 Summary | Full Text:PDF
A Predistortion Diode Linearizer Technique with Automatic Average Power Bias Control for a Class-F GaN HEMT Power Amplifier
Akihiro ANDO Yoichiro TAKAYAMA Tsuyoshi YOSHIDA Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/07/01
Vol. E94-C  No. 7  pp. 1193-1198
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
class-F power amplifier, GaN HEMT, diode linearizer, intermodulation distortion, diode bias control, 
 Summary | Full Text:PDF
UWB Active Balun Design with Small Group Delay Variation and Improved Return Loss
Kyoung-Pyo AHN Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/05/01
Vol. E94-C  No. 5  pp. 905-908
Type of Manuscript:  BRIEF PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
differential mode, group delay, negative group delay (NGD) circuit, return loss, ultra-wideband (UWB), 
 Summary | Full Text:PDF
Distortion Compensation for Thermal Memory Effect on InGaP/GaAs HBT Amplifier by Inserting RC-Ladder Circuit in Base Bias Circuit
Ryo ISHIKAWA Junichi KIMURA Yukio TAKAHASHI Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/07/01
Vol. E93-C  No. 7  pp. 958-965
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
thermal memory effect, IMD, distortion compensation, self heating, power amplifiers, HBT, 
 Summary | Full Text:PDF
Synthesis for Negative Group Delay Circuits Using Distributed and Second-Order RC Circuit Configurations
Kyoung-Pyo AHN Ryo ISHIKAWA Akira SAITOU Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/09/01
Vol. E92-C  No. 9  pp. 1176-1181
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies and Their Applications)
Category: 
Keyword: 
band-rejection filter, group delay, negative group delay (NGD) circuit, ultra-wideband (UWB), 
 Summary | Full Text:PDF
InGaP/GaAs HBT MMIC Amplifier with Low Power Consumption and Low Noise Characteristics for Full-Band UWB Receiver Systems
Ryo ISHIKAWA Takuya ABE Kazuhiko HONJO Masao SHIMADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/11/01
Vol. E91-C  No. 11  pp. 1828-1831
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
UWB, LNA, InGaP/GaP HBT, MMIC, 
 Summary | Full Text:PDF
Evaluation of Information Leakage from PC Displays Using Spectrum Analyzers
Toshihide TOSAKA Yukio YAMANAKA Kaori FUKUNAGA Ryo ISHIKAWA Mitsuo HATTORI 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2007/11/01
Vol. E90-B  No. 11  pp. 3315-3318
Type of Manuscript:  LETTER
Category: Electromagnetic Compatibility(EMC)
Keyword: 
electromagnetic disturbance, electromagnetic security, PC display, 
 Summary | Full Text:PDF
Accurate Distortion Prediction for Thermal Memory Effect in Power Amplifier Using Multi-Stage Thermal RC-Ladder Network
Yukio TAKAHASHI Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/09/01
Vol. E90-C  No. 9  pp. 1658-1663
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Active Devices/Circuits
Keyword: 
thermal memory effect, thermal resistance, thermal capacitance, thermal RC-ladder network, IMD3, 
 Summary | Full Text:PDF
InGaP/GaAs HBT MMIC Amplifier with Active Balun for Ultra-Wideband Self-Complementary Antenna
Itaru NAKAGAWA Ryo ISHIKAWA Kazuhiko HONJO Masao SHIMADA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/12/01
Vol. E89-C  No. 12  pp. 1814-1820
Type of Manuscript:  Special Section PAPER (Special Section on Emerging Microwave Techniques)
Category: Active Circuits/Devices/Monolithic Microwave Integrated Circuits
Keyword: 
broadband amplifier, UWB, active balun, HBT, microwave, self-complementary antenna, 
 Summary | Full Text:PDF
Microwave Class-F InGaP/GaAs HBT Power Amplifier Considering up to 7th-Order Higher Harmonic Frequencies
Masato SEKI Ryo ISHIKAWA Kazuhiko HONJO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2006/07/01
Vol. E89-C  No. 7  pp. 937-942
Type of Manuscript:  Special Section PAPER (Special Section on Heterostructure Microelectronics with TWHM2005)
Category: High-Speed HBTs and ICs
Keyword: 
microwave, class-F amplifier, InGaP/GaAs HBT, high-efficiency, PAE, base-collector capacitance, 
 Summary | Full Text:PDF
Experimental Verification of the Theory on Energy Modulation of an Electron Beam with an Optical Near-Field
Ryo ISHIKAWA Jongsuck BAE Koji MIZUNO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/12/01
Vol. E85-C  No. 12  pp. 2086-2092
Type of Manuscript:  Special Section PAPER (Special Issue on Near-Field Optics and Its Applications)
Category: 
Keyword: 
optical near field, evanescent wave, free electron, microslit, electron energy modulation, 
 Summary | Full Text:PDF