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IEICE Trans

Takashi TOMURA

Design for Operation in Two Frequency Bands by Division of the Coupled Region in a Waveguide 2-Plane Coupler
Shihao CHEN Takashi TOMURA Jiro HIROKAWA Kota ITO Mizuki SUGA Yushi SHIRATO Daisei UCHIDA Naoki KITA 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2022/12/01
Vol. E105-C  No. 12  pp. 729-739
Type of Manuscript:  PAPER
Category: Electromagnetic Theory
Keyword: 
coupler, finite element method, hollow waveguide, mode matching, 
 Summary | Full Text:PDF
Control of Radiation Direction in an Aperture Array Excited by a Waveguide 2-Plane Hybrid Coupler
Yuki SUNAGUCHI Takashi TOMURA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2022/08/01
Vol. E105-B  No. 8  pp. 906-912
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
waveguide 2-plane coupler, hybrid junction, radiation direction, diffraction suppression, reflection suppression, 
 Summary | Full Text:PDF
Transmission Characteristics Control of 120 GHz-Band Bandstop Filter by Coupling Alignment-Free Lattice Pattern
Akihiko HIRATA Koichiro ITAKURA Taiki HIGASHIMOTO Yuta UEMURA Tadao NAGATSUMA Takashi TOMURA Jiro HIROKAWA Norihiko SEKINE Issei WATANABE Akifumi KASAMATSU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2021/10/01
Vol. E104-C  No. 10  pp. 587-595
Type of Manuscript:  Special Section PAPER (Special Section on Microwave and Millimeter-Wave Technologies)
Category: 
Keyword: 
terahertz, filter, wireless communication, close-proximity wireless link, 
 Summary | Full Text:PDF
Control of 120-GHz-Band Split Ring Resonator Filter by Coupling Lattice Pattern Substrate
Koichiro ITAKURA Akihiko HIRATA Masato SONODA Taiki HIGASHIMOTO Tadao NAGATSUMA Takashi TOMURA Jiro HIROKAWA Norihiko SEKINE Issei WATANABE Akifumi KASAMATSU 
Publication:   IEICE TRANSACTIONS on Electronics
Publication Date: 2021/03/01
Vol. E104-C  No. 3  pp. 102-111
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
millimeter-wave filter, millimeter-wave propagation, millimeter-wave communication, 
 Summary | Full Text:PDF
Experimental Evaluation of Intersymbol Interference in Non-Far Region Transmission using a Large Array Antenna in the Millimeter-Wave Band
Tuchjuta RUCKKWAEN Takashi TOMURA Kiyomichi ARAKI Jiro HIROKAWA Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2020/10/01
Vol. E103-B  No. 10  pp. 1136-1146
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
intersymbol interference (ISI), non-far region, large array antenna, signal to noise plus interference (SINR), 
 Summary | Full Text:PDF
Sidelobe Suppression in Both the E and H Planes Using Slit Layers over a Corporate-Feed Waveguide Slot Array Antenna Consisting of 2×2-Element Radiating Units
Haruka ARAKAWA Takashi TOMURA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2020/09/01
Vol. E103-B  No. 9  pp. 960-968
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
full-corporate-feed, millimeter-wave antenna arrays, Taylor distribution, waveguide slot arrays, 
 Summary | Full Text:PDF
Transmission Enhancement in Rectangular-Coordinate Orthogonal Multiplexing by Excitation Optimization of Slot Arrays for a Given Distance in the Non-Far Region Communication
Ryotaro OHASHI Takashi TOMURA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2020/02/01
Vol. E103-B  No. 2  pp. 130-138
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
rectangular-coordinate orthogonal multiplexing, multiple-input multiple-output (MIMO), millimeter-wave antenna, munopulese circuit, 
 Summary | Full Text:PDF
Wideband Design of a Short-Slot 2-Plane Coupler by the Mode Matching/FEM Hybrid Analysis Considering the Structural Symmetry
Masahiro WAKASA Dong-Hun KIM Takashi TOMURA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2019/05/01
Vol. E102-B  No. 5  pp. 1019-1026
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
short-slot 2-plane coupler, mode matching technique, finite element method, 
 Summary | Full Text:PDF
A PCB-Integratable Metal Cap Slot Antenna for 60-GHz Band Mobile Terminals
Takashi TOMURA Haruhisa HIRAYAMA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2019/02/01
Vol. E102-B  No. 2  pp. 317-323
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
endfire antenna, metal cap antenna, millimeter wave, slot antenna, 
 Summary | Full Text:PDF
Perpendicular-Corporate Feed in a Four-Layer Circularly-Polarized Parallel-Plate Slot Array
Hisanori IRIE Takashi TOMURA Jiro HIROKAWA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2019/01/01
Vol. E102-B  No. 1  pp. 137-146
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
circularly-polarization, parallel plates, slot array, perpendicular-corporate feed, 
 Summary | Full Text:PDF
Simultaneous Optimal Design Method of Primary Radiator and Main Reflector for Shaped Beam Antennas
Takashi TOMURA Michio TAKIKAWA Yoshio INASAWA Hiroaki MIYASHITA 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2017/02/01
Vol. E100-B  No. 2  pp. 211-218
Type of Manuscript:  Special Section PAPER (Special Section on Antenna and Propagation Technologies Contributing to Realization of Next Generation Wireless Systems)
Category: 
Keyword: 
reflector antenna, shaped reflector, shaped beam, multimode horn, optimization, 
 Summary | Full Text:PDF
A Wideband 16×16-Element Corporate-Feed Hollow-Waveguide Slot Array Antenna in the 60-GHz Band
Takashi TOMURA Jiro HIROKAWA Takuichi HIRANO Makoto ANDO 
Publication:   IEICE TRANSACTIONS on Communications
Publication Date: 2014/04/01
Vol. E97-B  No. 4  pp. 798-806
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
corporate feed, millimeter-wave band, waveguide slot array, wideband, 
 Summary | Full Text:PDF