Hiroshi OKAZAKI


26 GHz Band Extremely Low-Profile Front-End Configuration Employing Integrated Modules of Patch Antennas and SIW Filters
Yasunori SUZUKI Takana KAHO Kei SATOH Hiroshi OKAZAKI Maki ARAI Yo YAMAGUCHI Shoichi NARAHASHI Hiroyuki SHIBA 
Publication:   
Publication Date: 2017/12/01
Vol. E100-C  No. 12  pp. 1097-1107
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
array antennaSIW filter3D-MMIClower profileradio access unit
 Summary | Full Text:PDF(1.8MB)

Parallel Ring-Line Rat-Race Circuit with Very Loose Coupling Utilizing Composite Right-/Left-Handed Transmission Lines
Tadashi KAWAI Yuma SUMITOMO Akira ENOKIHARA Isao OHTA Kei SATOH Yasunori SUZUKI Hiroshi OKAZAKI Shoichi NARAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/10/01
Vol. E97-C  No. 10  pp. 965-971
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
microwave passive componentsrat-race circuitloose couplingCRLH-TLwideband
 Summary | Full Text:PDF(2.1MB)

Tunable Resonator Employing Comb-shaped Transmission Line and Semiconductor Switches
Kunihiro KAWAI Daisuke KOIZUMI Hiroshi OKAZAKI Shoichi NARAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2014/08/01
Vol. E97-C  No. 8  pp. 795-802
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
Tunable resonatorsmicrostrip linesswitches
 Summary | Full Text:PDF(1.8MB)

Compact Tunable Isolator with a Variable Capacitor
Takayuki FURUTA Atsushi FUKUDA Hiroshi OKAZAKI Shoichi NARAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2013/01/01
Vol. E96-C  No. 1  pp. 84-92
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
multi-bandtunableisolatorvaractor diode
 Summary | Full Text:PDF(2.7MB)

Low-Loss Matching Network Design for Band-Switchable Multi-Band Power Amplifier
Atsushi FUKUDA Takayuki FURUTA Hiroshi OKAZAKI Shoichi NARAHASHI Toshio NOJIMA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/07/01
Vol. E95-C  No. 7  pp. 1172-1181
Type of Manuscript:  Special Section PAPER (Special Section on Recent Trends of Microwave Systems and Their Fundamental Technologies)
Category: 
Keyword: 
power amplifierreconfigurablematching networkmulti-bandswitch
 Summary | Full Text:PDF(3.2MB)

Detailed Analysis of Multilayer Broad-Side Coupler with a Symmetric Structure
Hiroshi OKAZAKI Kiyomichi ARAKI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/08/01
Vol. E94-C  No. 8  pp. 1253-1261
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
broad-side couplerscoupled transmission linesmultilayer MMICsymmetric structure
 Summary | Full Text:PDF(1.2MB)

Highly Efficient Multi-Band Power Amplifier Employing Reconfigurable Matching and Biasing Networks
Atsushi FUKUDA Hiroshi OKAZAKI Shoichi NARAHASHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/07/01
Vol. E93-C  No. 7  pp. 949-957
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
power amplifierreconfigurablematching networkbiasing networkmulti-bandswitchmicroelectro mechanical systems
 Summary | Full Text:PDF(2.1MB)

Novel Band-Reconfigurable High Efficiency Power Amplifier Employing RF-MEMS Switches
Atsushi FUKUDA Hiroshi OKAZAKI Tetsuo HIROTA Yasushi YAMAO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/11/01
Vol. E88-C  No. 11  pp. 2141-2149
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
band-switchable matching networkmicroelectro mechanical devicesmulti-bandswitchespower amplifiers
 Summary | Full Text:PDF(907.5KB)

A Monolithic Linearizer Using an Even-Order-Distortion Controller for an S-Band High Power Amplifier
Takana KAHO Hiroshi OKAZAKI Tadao NAKAGAWA Katsuhiko ARAKI Kohji HORIKAWA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2002/12/01
Vol. E85-C  No. 12  pp. 1959-1966
Type of Manuscript:  Special Section PAPER (Special Issue on Low-Distortion,High-Power,High-Efficiency Active Device and Circuit Technology)
Category: 
Keyword: 
linearizeramplifierGaAs MMICsatellite communication
 Summary | Full Text:PDF(1.2MB)

Compact Monolithic Frequency Converters for a V-Band Transmitter/Receiver
Hiroshi OKAZAKI Tetsuo HIROTA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 1996/12/25
Vol. E79-B  No. 12  pp. 1754-1758
Type of Manuscript:  Special Section PAPER (Special Issue on Millimeter-wave Short-range Application Systems Technology)
Category: 
Keyword: 
MMICup-converterdown-converterresistive FET mixer
 Summary | Full Text:PDF(432.7KB)