Ryo ISHIKAWA


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 amplifierhigh efficiencyband selectiveGaN HEMTPIN diode
 Summary | Full Text:PDF(2.2MB)

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 networksCode Modulationsynchronous-OOKSOTB
 Summary | Full Text:PDF(2.1MB)

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 amplifiermicrowavepower amplifierGaAs HEMTseries connected load typeMMICbroadband
 Summary | Full Text:PDF(2.6MB)

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 efficiencypower amplifieractive load-pullharmonic tuning
 Summary | Full Text:PDF(1.4MB)

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: 
resonatorQ-factormicrostrip linecoplanar waveguideMMICoscillatorsphase noise
 Summary | Full Text:PDF(1.5MB)

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 antennasdipole antennasequivalent circuitdual-band antennavaractorsmultipole expansion
 Summary | Full Text:PDF(1.6MB)

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: 
modulationpower transmissionamplitude-shift keyingscatterer
 Summary | Full Text:PDF(4.9MB)

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: 
cascodeInGaP/GaAs HBTmicrowave power amplifier
 Summary | Full Text:PDF(2.1MB)

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 transmissionscattererlumped elementmodulation factormutual impedance
 Summary | Full Text:PDF(1.3MB)

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 amplifierGaN HEMTdiode linearizerintermodulation distortiondiode bias control
 Summary | Full Text:PDF(1.7MB)

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 modegroup delaynegative group delay (NGD) circuitreturn lossultra-wideband (UWB)
 Summary | Full Text:PDF(879.1KB)

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 effectIMDdistortion compensationself heatingpower amplifiersHBT
 Summary | Full Text:PDF(2.3MB)

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 filtergroup delaynegative group delay (NGD) circuitultra-wideband (UWB)
 Summary | Full Text:PDF(1.2MB)

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: 
UWBLNAInGaP/GaP HBTMMIC
 Summary | Full Text:PDF(356KB)

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 disturbanceelectromagnetic securityPC display
 Summary | Full Text:PDF(281.6KB)

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 effectthermal resistancethermal capacitancethermal RC-ladder networkIMD3
 Summary | Full Text:PDF(727.9KB)

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 amplifierUWBactive balunHBTmicrowaveself-complementary antenna
 Summary | Full Text:PDF(698.4KB)

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: 
microwaveclass-F amplifierInGaP/GaAs HBThigh-efficiencyPAEbase-collector capacitance
 Summary | Full Text:PDF(872.7KB)

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 fieldevanescent wavefree electronmicroslitelectron energy modulation
 Summary | Full Text:PDF(647.3KB)