Takashi TOMURA


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:   
Publication Date: 2021/03/01
Vol. E104-C  No. 3  pp. 102-111
Type of Manuscript:  PAPER
Category: Electronic Circuits
Keyword: 
millimeter-wave filtermillimeter-wave propagationmillimeter-wave communication
 Summary | Full Text:PDF(2.5MB)

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:   
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 regionlarge array antennasignal to noise plus interference (SINR)
 Summary | Full Text:PDF(1.9MB)

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:   
Publication Date: 2020/09/01
Vol. E103-B  No. 9  pp. 960-968
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
full-corporate-feedmillimeter-wave antenna arraysTaylor distributionwaveguide slot arrays
 Summary | Full Text:PDF(4.1MB)

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:   
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 multiplexingmultiple-input multiple-output (MIMO)millimeter-wave antennamunopulese circuit
 Summary | Full Text:PDF(4.7MB)

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:   
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 couplermode matching techniquefinite element method
 Summary | Full Text:PDF(2.4MB)

A PCB-Integratable Metal Cap Slot Antenna for 60-GHz Band Mobile Terminals
Takashi TOMURA Haruhisa HIRAYAMA Jiro HIROKAWA 
Publication:   
Publication Date: 2019/02/01
Vol. E102-B  No. 2  pp. 317-323
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
endfire antennametal cap antennamillimeter waveslot antenna
 Summary | Full Text:PDF(3.1MB)

Perpendicular-Corporate Feed in a Four-Layer Circularly-Polarized Parallel-Plate Slot Array
Hisanori IRIE Takashi TOMURA Jiro HIROKAWA 
Publication:   
Publication Date: 2019/01/01
Vol. E102-B  No. 1  pp. 137-146
Type of Manuscript:  PAPER
Category: Antennas and Propagation
Keyword: 
circularly-polarizationparallel platesslot arrayperpendicular-corporate feed
 Summary | Full Text:PDF(6.8MB)

Simultaneous Optimal Design Method of Primary Radiator and Main Reflector for Shaped Beam Antennas
Takashi TOMURA Michio TAKIKAWA Yoshio INASAWA Hiroaki MIYASHITA 
Publication:   
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 antennashaped reflectorshaped beammultimode hornoptimization
 Summary | Full Text:PDF(1.4MB)

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 feedmillimeter-wave bandwaveguide slot arraywideband
 Summary | Full Text:PDF(3.2MB)