Tadashi KAWAI


Design of Multi-Way LC-Ladder Dividers with Multi-Band Operation
Yosuke OKADA Tadashi KAWAI Akira ENOKIHARA 
Publication:   
Publication Date: 2017/10/01
Vol. E100-C  No. 10  pp. 893-900
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: 
Keyword: 
power dividerLC-ladder circuitmulti-bandmulti-division
 Summary | Full Text:PDF(2MB)

Low Chirp Modulation by Electro-Optic Intensity Modulator Using Microwave 180-Degree Hybrid Directly Formed on LiNbO3 Substrate
Akira ENOKIHARA Masashi YAMAMOTO Tadashi KAWAI Tetsuya KAWANISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/08/01
Vol. E98-C  No. 8  pp. 777-782
Type of Manuscript:  Special Section PAPER (Special Section on Microwave Photonics)
Category: MWP Device and Application
Keyword: 
light-frequency chirpelectro-optic modulatorrat-raceMach-Zehnder interferometer
 Summary | Full Text:PDF(1.5MB)

Compact Electro-Optic Single Sideband Modulators Utilizing Miniaturized Branch-Line Couplers on LiNbO3 Substrate
Katsuyuki YAMAMOTO Tadashi KAWAI Akira ENOKIHARA Tetsuya KAWANISHI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2015/08/01
Vol. E98-C  No. 8  pp. 769-776
Type of Manuscript:  Special Section PAPER (Special Section on Microwave Photonics)
Category: MWP Device and Application
Keyword: 
electro-optic modulatorssingle sideband modulationmicrowave photonicsbranch-line coupler
 Summary | Full Text:PDF(3MB)

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)

Design and Fabrication of PTFE-Filled Waveguide Components by SR Direct Etching
Mitsuyoshi KISHIHARA Hiroaki IKEUCHI Yuichi UTSUMI Tadashi KAWAI Isao OHTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2012/01/01
Vol. E95-C  No. 1  pp. 122-129
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
X-ray lithographybandpass filtersdirectional couplerssputteringdielectric materials
 Summary | Full Text:PDF(2.3MB)

Design of an H-Plane Waveguide Intersection with High Isolation
Hiroaki IKEUCHI Tadashi KAWAI Mitsuyoshi KISHIHARA Isao OHTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2011/10/01
Vol. E94-C  No. 10  pp. 1572-1578
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technology)
Category: Passive Devices and Circuits
Keyword: 
microwavewaveguide circuitwaveguide intersectioncrossoverSIW
 Summary | Full Text:PDF(1.1MB)

Band-Broadening Design Technique of CRLH-TLs Dual-Band Branch-Line Couplers Using CRLH-TLs Matching Networks
Tadashi KAWAI Miku NAKAMURA Isao OHTA Akira ENOKIHARA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2010/07/01
Vol. E93-C  No. 7  pp. 1072-1077
Type of Manuscript:  Special Section PAPER (Special Section on Recent Progress in Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
branch-line couplermatching networkCRLH-TLdual-bandequivalent admittance approachsize reduction
 Summary | Full Text:PDF(2MB)

Fabrication of Wide Band Metallic Bend Waveguide with Asymmetric In-Line Dielectric Rods
Yoshihiro KOKUBO Tadashi KAWAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2009/12/01
Vol. E92-C  No. 12  pp. 1538-1540
Type of Manuscript:  BRIEF PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
dielectric rodscylindrical arraysingle modeasymmetrywaveguide
 Summary | Full Text:PDF(412.7KB)

Wide Band Metallic Waveguide with Asymmetric In-Line Dielectric Rods
Yoshihiro KOKUBO Tadashi KAWAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/12/01
Vol. E91-C  No. 12  pp. 1966-1968
Type of Manuscript:  LETTER
Category: Microwaves, Millimeter-Waves
Keyword: 
dielectric rodscylindrical arraysingle modeasymmetry
 Summary | Full Text:PDF(309.7KB)

Dual-Band Wilkinson Power Dividers Using a Series RLC Circuit
Tadashi KAWAI Yasuaki NAKASHIMA Yoshihiro KOKUBO Isao OHTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/11/01
Vol. E91-C  No. 11  pp. 1793-1797
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-wave Technologies)
Category: 
Keyword: 
microwave passive componentsdual-bandpower dividerWilkinson power divider
 Summary | Full Text:PDF(526KB)

Parallel Coupled Microstrip Couplers Compensated with Periodic Floating-Conductors on Coupled Edges
Takao FUJII Isao OHTA Tadashi KAWAI Yoshihiro KOKUBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2008/05/01
Vol. E91-C  No. 5  pp. 780-787
Type of Manuscript:  PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
artificial coupled-linedirectional couplersmicrostrip couplersparallel coupled linesperiodically loading
 Summary | Full Text:PDF(1.8MB)

Miniature Broad-Band CPW 3-dB Branch-Line Couplers in Slow-Wave Structure
Takao FUJII Isao OHTA Tadashi KAWAI Yoshihiro KOKUBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/12/01
Vol. E90-C  No. 12  pp. 2245-2253
Type of Manuscript:  Special Section PAPER (Special Section on Recent Technologies for Microwave and Millimeter-wave Passive Devices)
Category: 
Keyword: 
coplanar waveguidesdirectional couplershybridsequivalent admittancemicrowave circuitsslow-wave structure
 Summary | Full Text:PDF(1.7MB)

Economic Setup for a Dual-Band Metallic Waveguide with Dual In-Line Dielectric Rods
Yoshihiro KOKUBO Sotaro YOSHIDA Tadashi KAWAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2007/12/01
Vol. E90-C  No. 12  pp. 2261-2262
Type of Manuscript:  Special Section LETTER (Special Section on Recent Technologies for Microwave and Millimeter-wave Passive Devices)
Category: 
Keyword: 
bend waveguidecylindrical arraydielectric rodeconomy
 Summary | Full Text:PDF(161.6KB)

Design of Quadrature Hybrids and Directional Couplers Based on the Equivalent Admittance Approach
Isao OHTA Tadashi KAWAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/01/01
Vol. E88-C  No. 1  pp. 2-14
Type of Manuscript:  INVITED PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
Category: 
Keyword: 
microwave passive componentdirectional couplerhybridmicrowave integrated circuitequivalent admittance approach
 Summary | Full Text:PDF(2.3MB)

Broadband Multi-Way Microstrip Power Dividers
Mitsuyoshi KISHIHARA Kuniyoshi YAMANE Isao OHTA Tadashi KAWAI 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2005/01/01
Vol. E88-C  No. 1  pp. 20-27
Type of Manuscript:  Special Section PAPER (Special Section on Recent Trends of Microwave and Millimeter-Wave Passive Circuit Components and Technologies for Improvement of Characteristics)
Category: 
Keyword: 
power dividersmicrostrip componentsmultiport circuitsChebyshev transformersdesign automation
 Summary | Full Text:PDF(1.3MB)

A New Wide-Band and Reduced-Size Hybrid Ring
Tadashi KAWAI Isao OHTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/02/01
Vol. E86-C  No. 2  pp. 134-138
Type of Manuscript:  Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Passive (Coupler)
Keyword: 
hybrid ringequivalent admittanceuniplanar circuitphase inverterbroadband
 Summary | Full Text:PDF(300.4KB)

Asymmetrical Coupled-HNRD-Guide Directional Couplers with Flat Coupling
Mitsuyoshi KISHIHARA Isao OHTA Tadashi KAWAI Kuniyoshi YAMANE 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2003/02/01
Vol. E86-C  No. 2  pp. 126-133
Type of Manuscript:  Special Section PAPER (Special Issue on Circuit and Device Technology for High-Speed Wireless Communication)
Category: Passive (Coupler)
Keyword: 
NRD guidetransverse resonance techniquedirectional couplermillimeter wavecoupled-line
 Summary | Full Text:PDF(898.2KB)

A Novel 180-Degree 3 dB Hybrid Using a Cylindrical Cavity
Mitsuyoshi KISHIHARA Tadashi KAWAI Yoshihiro KOKUBO Isao OHTA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1999/07/25
Vol. E82-C  No. 7  pp. 1148-1153
Type of Manuscript:  Special Section PAPER (Special Issue on Microwave and Millimeter Wave Technology)
Category: Passive Devices and Circuits
Keyword: 
waveguidewaveguide componentE-plane planar circuithybrid
 Summary | Full Text:PDF(1.1MB)

A Power-Combining system of Four Oscillators Using an Eight-Port Hybrid
Isao OHTA Tadashi KAWAI Yoshihiro KOKUBO 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 1996/10/25
Vol. E79-C  No. 10  pp. 1449-1454
Type of Manuscript:  PAPER
Category: Microwave and Millimeter Wave Technology
Keyword: 
microwavemicrowave oscillatorpower combiningparallel runningmutual synchronization
 Summary | Full Text:PDF(489.4KB)