Jiro Hirokawa

104 papers C 1Journal 99Unranked 4
YearRankTypeTitle / Venue / Authors
2024 J jnl
Effective Design of an Array of Coupling Slots With a Reflection-Canceling Wall for a Parallel-Plate Slot Array Antenna.
IEEE Access
Tianyu Wang, Takashi Tomura, Jiro Hirokawa
2024 J jnl
Wavelet OFDM Wireless Communication System for Autonomous Underwater Vehicles Using Loop-Shaped Antennas in Underwater Environments.
IEEE Access
Ryosuke Hasaba, Kazuhiro Eguchi, Toshiyuki Wakisaka, Jiro Hirokawa, Miyuki Hirose, Tohlu Matsushima, Yuki Fukumoto, Yuya Nishida, Kazuo Ishii
2023 J jnl
A Broadband Full-Corporate-Fed Slot Array Antenna Based on the Single-Layer Substrate Integrated Waveguide.
IEEE Access
Baoquan Duan, Shijiu Zheng, Miao Zhang, Jiro Hirokawa, Qing Huo Liu
2023 J jnl
A Center-Fed Dual-Polarized Parallel-Plate Waveguide Slot Array Antenna Based on a Feeding Waveguide With Centered Longitudinal Feeding Slots.
IEEE Access
Huanqian Xiong, Jiro Hirokawa, Takashi Tomura
2023 J jnl
A Double Layer Cross-Slot Aperture-Fed Millimeter-Wave Antenna Array With Wide Axial Ratio Bandwidth.
IEEE Access
Maharana Pratap Singh, Jiro Hirokawa, Saptarshi Ghosh
2023 J jnl
A Two-Dimensional 6×4-Way Hollow Waveguide Beam-Switching Matrix.
IEEE Access
Qi Li, Jiro Hirokawa, Takashi Tomura, Yuta Takahashi, Naoki Kita, Nelson J. G. Fonseca
2023 — conf
Directional beam antenna control in response to drone tilts.
ICCE-Taiwan
Chikayo Hata, Takefumi Hiraguri, Takahiro Matsuda, Tetsuro Imai, Jiro Hirokawa
2022 J jnl
A Wideband and High-Gain All-Metallic Perpendicular-Corporate-Fed Multi-Layered Parallel-Plate Slot Array Antenna.
IEEE Access
Shuang Ji, Jiro Hirokawa, Takashi Tomura
2022 J jnl
Control of Radiation Direction in an Aperture Array Excited by a Waveguide 2-Plane Hybrid Coupler.
IEICE Trans. Commun.
Yuki Sunaguchi, Takashi Tomura, Jiro Hirokawa
2022 J jnl
Design for Operation in Two Frequency Bands by Division of the Coupled Region in a Waveguide 2-Plane Coupler.
IEICE Trans. Electron.
Shihao Chen, Takashi Tomura, Jiro Hirokawa, Kota Ito, Mizuki Suga, Yushi Shirato, Daisei Uchida, Naoki Kita
2022 J jnl
Design of the Circularly Polarized Ring Microstrip Antenna with Shorting Pins.
IEICE Trans. Commun.
Jun Goto, Akimichi Hirota, Kyosuke Mochizuki, Satoshi Yamaguchi, Kazunari Kihira, Toru Takahashi, Hideo Sumiyoshi, Masataka Otsuka, Naofumi Yoneda, Jiro Hirokawa
2022 J jnl
Multibeam Patterns Suitable for Massive MIMO Configurations.
IEICE Trans. Commun.
Kentaro Nishimori, Jiro Hirokawa
2021 J jnl
Analysis of Intersymbol Interference Characterized by the Large Array Antennas Adopted in a 60-GHz-Band Gigabit Compact-Range Wireless Access System.
IEEE Access
Miao Zhang, Masahiro Wakasa, Koji Toyosaki, Kiyomichi Araki, Jiro Hirokawa, Makoto Ando
2021 J jnl
Control of 120-GHz-Band Split Ring Resonator Filter by Coupling Lattice Pattern Substrate.
IEICE Trans. Electron.
Koichiro Itakura, Akihiko Hirata, Masato Sonoda, Taiki Higashimoto, Tadao Nagatsuma, Takashi Tomura, Jiro Hirokawa, Norihiko Sekine, Issei Watanabe, Akifumi Kasamatsu
2021 J jnl
Design of the Traveling-Wave Series-Fed Microstrip Antenna Array with Power Control Slits of Unequal Inter-Element Spacing.
IEICE Trans. Commun.
Jun Goto, Makoto Matsuki, Takashi Maruyama, Toru Fukasawa, Naofumi Yoneda, Jiro Hirokawa
2021 J jnl
Realization of a Wideband Series-Fed 4 × 4-Element Waveguide Slot Array in the X-Band.
IEEE Access
Jiyu He, Yaxiang Wu, Dan Chen, Miao Zhang, Jiro Hirokawa, Qing Huo Liu
2021 J jnl
Transmission Characteristics Control of 120 GHz-Band Bandstop Filter by Coupling Alignment-Free Lattice Pattern.
IEICE Trans. Electron.
Akihiko Hirata, Koichiro Itakura, Taiki Higashimoto, Yuta Uemura, Tadao Nagatsuma, Takashi Tomura, Jiro Hirokawa, Norihiko Sekine, Issei Watanabe, Akifumi Kasamatsu
2020 J jnl
8 × 2-Element 60-GHz-Band Circularly Polarized Post-Wall Waveguide Slot Array Antenna Loaded With Dipoles.
IEEE Access
Takashi Tomura, Yuta Saito, Jiro Hirokawa
2020 J jnl
A Four-Corner-Fed Slotted Waveguide Sparse Array for Near-Field Focusing.
IEEE Access
Yaxiang Wu, Bolin Jiang, Miao Zhang, Jiro Hirokawa, Qing Huo Liu
2020 J jnl
Development and Performance Evaluation of Small SAR System for 100-kg Class Satellite.
IEEE J. Sel. Top. Appl. Earth Obs. Remote. Sens.
Pyne Budhaditya, Hirobumi Saito, Prilando Riziki Akbar, Jiro Hirokawa, Takashi Tomura, Koji Tanaka
2020 J jnl
Experimental Evaluation of Intersymbol Interference in Non-Far Region Transmission using a Large Array Antenna in the Millimeter-Wave Band.
IEICE Trans. Commun.
Tuchjuta Ruckkwaen, Takashi Tomura, Kiyomichi Araki, Jiro Hirokawa, Makoto Ando
2020 J jnl
Laser-Drilled All-Dielectric Huygens' Transmit-Arrays as 120 GHz Band Beamformers.
IEEE Access
Mohamed K. Emara, Sonya K. Stuhec-Leonard, Takashi Tomura, Jiro Hirokawa, Shulabh Gupta
2020 J jnl
Novel Unmanned Aerial Vehicle-Based Line-of-Sight MIMO Configuration Independent of Transmitted Distance Using Millimeter Wave.
IEEE Access
Naoki Matsumura, Kentaro Nishimori, Ryotaro Taniguchi, Takefumi Hiraguri, Takashi Tomura, Jiro Hirokawa
2020 J jnl
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.
IEICE Trans. Commun.
Haruka Arakawa, Takashi Tomura, Jiro Hirokawa
2020 J jnl
Transmission Enhancement in Rectangular-Coordinate Orthogonal Multiplexing by Excitation Optimization of Slot Arrays for a Given Distance in the Non-Far Region Communication.
IEICE Trans. Commun.
Ryotaro Ohashi, Takashi Tomura, Jiro Hirokawa
2019 J jnl
12- and 21-GHz Dual-Band Dual-Circularly Polarized Offset Parabolic Reflector Antenna Fed by Microstrip Antenna Arrays for Satellite Broadcasting Reception.
IEICE Trans. Commun.
Masafumi Nagasaka, Masaaki Kojima, Hisashi Sujikai, Jiro Hirokawa
2019 J jnl
A 20-GHz-Band 64 × 64 Hollow Waveguide Two-Dimensional Butler Matrix.
IEEE Access
Takashi Tomura, Dong-Hun Kim, Masahiro Wakasa, Yuki Sunaguchi, Jiro Hirokawa, Kentaro Nishimori
2019 J jnl
A PCB-Integratable Metal Cap Slot Antenna for 60-GHz Band Mobile Terminals.
IEICE Trans. Commun.
Takashi Tomura, Haruhisa Hirayama, Jiro Hirokawa
2019 C conf
Development of Compact SAR Systems for Small Satellite.
IGARSS
Hirobumi Saito, Koichi Ijichi, Jiro Hirokawa, Takashi Tomura, Prilando Rizki Akbar, Pyne Budhaditya, Koji Tanaka, Makoto Mita, Tomoki Kaneko, Hiromi Watanabe
2019 J jnl
Fabrication and Evaluation of Integrated Photonic Array-Antenna System for RoF Based Remote Antenna Beam Forming.
IEICE Trans. Electron.
Takayoshi Hirasawa, Shigeyuki Akiba, Jiro Hirokawa, Makoto Ando
2019 J jnl
Foreword.
IEICE Trans. Commun.
Monai Krairiksh, Jiro Hirokawa
2019 — conf
Millimeter Wave Antenna for Information Shower: Design Choices and Performance.
EuCNC
Sergio Barberis, Daniele Disco, Roberto Vallauri, Takashi Tomura, Jiro Hirokawa
2019 J jnl
Perpendicular-Corporate Feed in a Four-Layer Circularly-Polarized Parallel-Plate Slot Array.
IEICE Trans. Commun.
Hisanori Irie, Takashi Tomura, Jiro Hirokawa
2019 J jnl
Wideband Design of a Short-Slot 2-Plane Coupler by the Mode Matching/FEM Hybrid Analysis Considering the Structural Symmetry.
IEICE Trans. Commun.
Masahiro Wakasa, Dong-Hun Kim, Takashi Tomura, Jiro Hirokawa
2018 J jnl
A Compact Multi-Beam End-Fire Circularly Polarized Septum Antenna Array for Millimeter-Wave Applications.
IEEE Access
Xiaohe Cheng, Yuan Yao, Takashi Tomura, Jiro Hirokawa, Tao Yu, Junsheng Yu, Xiaodong Chen
2018 J jnl
Absorber Integrated Planar Slot Array Antenna for Suppression of Multiple Reflection in 120-GHz-Band Close-Proximity Wireless System.
IEICE Trans. Electron.
Akihiko Hirata, Jiro Hirokawa
2018 J jnl
Foreword.
IEICE Trans. Commun.
Jiro Hirokawa
2018 J jnl
Future 5G Millimeter-Wave Systems and Terminals: Propagation Channel, Communication Techniques, Devices, and Measurements.
IEEE Commun. Mag.
Pablo Padilla, Jiro Hirokawa, Lars J. Foged, Juha Ala-Laurinahoo, Damir Senic, Astrid Algaba-Brazález, Ahmed Hussain, Juan F. Valenzuela-Valdés
2018 J jnl
Millimeter-Wave Frequency Beam Scanning Array With a Phase Shifter Based on Substrate-Integrated-Waveguide.
IEEE Access
Xiaohe Cheng, Yuan Yao, Takashi Tomura, Jiro Hirokawa, Tao Yu, Junsheng Yu, Xiaodong Chen
2018 J jnl
Performance Analysis and Hardware Verification of Feature Detection Using Cyclostationarity in OFDM Signal.
IEICE Trans. Commun.
Akihide Nagamine, Kanshiro Kashiki, Fumio Watanabe, Jiro Hirokawa
2018 J jnl
Wideband Waveguide Short-Slot 2-Plane Coupler Using Frequency Shift of Propagating Modes.
IEICE Trans. Electron.
Dong-Hun Kim, Jiro Hirokawa, Makoto Ando
2017 J jnl
60GHz-Band Photonic-Integrated Array-Antenna and Module for Radio-over-Fiber-Based Beam Forming.
IEICE Trans. Commun.
Kotoko Furuya, Takayoshi Hirasawa, Masayuki Oishi, Shigeyuki Akiba, Jiro Hirokawa, Makoto Ando
2017 J jnl
A TM
IEICE Trans. Electron.
Vinay Ravindra, Hirobumi Saito, Jiro Hirokawa, Miao Zhang, Atsushi Tomiki
2017 J jnl
Alignment Control System Using Beam-Tilting 1-D Waveguide-Slot Array Antennas for 120-GHz-Band Corporate-Feed High-Gain 2-D Arrays.
IEICE Trans. Commun.
Akihiko Hirata, Jun Takeuchi, Keisuke Hashimoto, Jiro Hirokawa
2017 J jnl
Compact X-Band Synthetic Aperture Radar for 100kg Class Satellite.
IEICE Trans. Commun.
Hirobumi Saito, Prilando Rizki Akbar, Hiromi Watanabe, Vinay Ravindra, Jiro Hirokawa, Kenji Ura, Pyne Budhaditya
2017 J jnl
One-Body 2-D Beam-Switching Butler Matrix with Waveguide Short-Slot 2-Plane Couplers.
IEICE Trans. Electron.
Dong-Hun Kim, Jiro Hirokawa, Makoto Ando
2017 — conf
Performance analysis and hardware verification of signal detection scheme using cyclic prefix in OFDM.
WPMC
Akihide Nagamine, Kanshiro Kashiki, Fumio Watanabe, Jiro Hirokawa
2017 J jnl
Plate-Laminated Waveguide Monopulse Slot Array Antenna with Full-Corporate-Feed in the E-Band.
IEICE Trans. Commun.
Xin Xu, Jiro Hirokawa, Makoto Ando
2017 J jnl
Recent Technologies in Japan on Array Antennas for Wireless Systems.
IEICE Trans. Commun.
Jiro Hirokawa, Qiang Chen, Mitoshi Fujimoto, Ryo Yamaguchi
2016 J jnl
A 12×16-Element Double-Layer Corporate-Feed Waveguide Slot Array Antenna.
IEICE Trans. Commun.
Satoshi Ito, Miao Zhang, Jiro Hirokawa, Makoto Ando
2016 J jnl
A 60GHz-Band High-Efficiency Antenna with a Thick Resin Layer and Differentially Fed through a Hole in a Silicon Chip.
IEICE Trans. Commun.
Naoya Oikawa, Jiro Hirokawa, Hiroshi Nakano, Yasutake Hirachi, Hiroshi Isono, Atsushi Ishii, Makoto Ando
2016 J jnl
Practical considerations of terahertz communications for short distance applications.
Nano Commun. Networks
Tadao Nagatsuma, Kazuki Oogimoto, Yuki Inubushi, Jiro Hirokawa
2015 J jnl
Design of mm-Wave RLSAs with Lossy Waveguides by Slot Coupling Control Techniques.
IEICE Trans. Commun.
Tung Nguyen, Jiro Hirokawa, Makoto Ando, Manuel Sierra-Castañer
2015 J jnl
Foreword.
IEICE Trans. Commun.
Jiro Hirokawa
2015 J jnl
Rain Sensing Using Dual-Frequency Measurements from Small-Scale Millimeter-Wave Network.
IEICE Trans. Commun.
Hung V. Le, Carlo Capsoni, Roberto Nebuloni, Lorenzo Luini, Takuichi Hirano, Toru Taniguchi, Jiro Hirokawa, Makoto Ando
2014 J jnl
A Partially-Corporate Feed Double-Layer Waveguide Slot Array with the Sub-Arrays also Fed in Alternating-Phases.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2014 J jnl
A Simple Through-Hole Based Transformer between Microstrip Line and Post-Wall Waveguide for Millimeter-Wave Applications.
IEICE Trans. Electron.
Yusuke Uemichi, Ryouhei Hosono, Ning Guan, Jiro Hirokawa, Makoto Ando
2014 J jnl
A Wideband 16×16-Element Corporate-Feed Hollow-Waveguide Slot Array Antenna in the 60-GHz Band.
IEICE Trans. Commun.
Takashi Tomura, Jiro Hirokawa, Takuichi Hirano, Makoto Ando
2014 J jnl
Double-Layer Plate-Laminated Waveguide Slot Array Antennas for a 39GHz Band Fixed Wireless Access System.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2014 J jnl
Millimeter-Wave Propagation Characteristics and Localized Rain Effects in a Small-Scale University Campus Network in Tokyo.
IEICE Trans. Commun.
Hung V. Le, Hasan Md. Mohibul, Takuichi Hirano, Toru Taniguchi, Akira Yamaguchi, Jiro Hirokawa, Makoto Ando
2014 J jnl
Phased Array Antenna Beam Steering Scheme for Future Wireless Access Systems Using Radio-over-Fiber Technique.
IEICE Trans. Commun.
Masayuki Oishi, Yoshihiro Nishikawa, Kosuke Nishimura, Keiji Tanaka, Shigeyuki Akiba, Jiro Hirokawa, Makoto Ando
2014 — conf
Photonic architecture for beam forming of RF phased array antenna.
OFC
Shigeyuki Akiba, Masayuki Oishi, Yoshihiro Nishikawa, Kyo Minoguchi, Jiro Hirokawa, Makoto Ando
2014 J jnl
Propagation Characteristics of Honeycomb Structures Used in mm-Wave Radial Line Slot Antennas.
IEICE Trans. Commun.
Tung Nguyen, Rushanthi Jayawardene, Kimio Sakurai, Jiro Hirokawa, Makoto Ando, Manuel Sierra-Castañer, Osamu Amano, Shuichi Koreeda, Takaomi Matsuzaki, Yukio Kamata
2013 J jnl
An Equivalent Double Layer Model for a Fast Design and Analysis of High Gain-Multilayer Radial Line Slot Antennas.
IEICE Trans. Commun.
Tung Nguyen, Rushanthi Jayawardene, Yasutomo Takano, Kimio Sakurai, Jiro Hirokawa, Makoto Ando, Osamu Amano, Shuichi Koreeda, Takaomi Matsuzaki, Yukio Kamata
2013 J jnl
Design and Measurement of the Plate Laminated Waveguide Slot Array Antenna and Its Feasibility for Wireless Link System in the 120 GHz Band.
IEICE Trans. Commun.
Dongjin Kim, Jiro Hirokawa, Kimio Sakurai, Makoto Ando, Takuma Takada, Tadao Nagatsuma, Jun Takeuchi, Akihiko Hirata
2013 J jnl
Manufacture and Performance of a 60GHz-Band High-Efficiency Antenna with a Thick Resin Layer and the Feed through a Hole in a Silicon Chip.
IEICE Trans. Commun.
Jun Asano, Jiro Hirokawa, Hiroshi Nakano, Yasutake Hirachi, Hiroshi Isono, Atsushi Ishii, Makoto Ando
2012 J jnl
LTCC Partially-Filled Post-Wall Rectangular-Waveguide Slot Array Antenna in the Millimeter-Wave Band.
IEICE Trans. Electron.
Yuanfeng She, Jiro Hirokawa, Makoto Ando, Daisuke Hanatani, Masahiro Fujimoto
2011 J jnl
A Center-Feed Linear Array of Reflection-Canceling Slot Pairs on Post-Wall Waveguide.
IEICE Trans. Commun.
Jae-Ho Lee, Jiro Hirokawa, Makoto Ando
2011 J jnl
A High-Efficiency Circularly-Polarized Aperture Array Antenna with a Corporate-Feed Circuit in the 60 GHz Band.
IEICE Trans. Electron.
Yohei Miura, Jiro Hirokawa, Makoto Ando, Kazufumi Igarashi, Goro Yoshida
2011 J jnl
Eigenmode Analysis of Propagation Constant for a Microstrip Line with Dummy Fills on a Si CMOS Substrate.
IEICE Trans. Electron.
Yuya Ono, Takuichi Hirano, Kenichi Okada, Jiro Hirokawa, Makoto Ando
2011 J jnl
Full-Wave Design Considering Slot Admittance in 2-D Waveguide Slot Arrays with Perfect Input Matching.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2011 J jnl
Loss of Post-Wall Waveguides and Efficiency Estimation of Parallel-Plate Slot Arrays Fed by the Post-Wall Waveguide in the Millimeter-Wave Band.
IEICE Trans. Electron.
Yuanfeng She, Thi Huong Tran, Koh Hashimoto, Jiro Hirokawa, Makoto Ando
2011 J jnl
Practical Slot Array Design by Method of Moments Using One Basis Function and Constant Correction Length.
IEICE Trans. Commun.
Jae-Ho Lee, Takuichi Hirano, Jiro Hirokawa, Makoto Ando
2010 J jnl
A Coaxial Feeder with Two Pairs of Parasitic Pins for Realizing Rotationally Symmetric Aperture Illumination in Spiral Array Radial Line Slot Antennas.
IEICE Trans. Commun.
Hideki Ueda, Jiro Hirokawa, Makoto Ando, Matteo Albani
2010 J jnl
A Post-Wall Center-Feed Waveguide Circuit Consisting of T-Junctions for Reducing the Slot-Free Area in a Parallel Plate Slot Array Antenna.
IEICE Trans. Electron.
Koh Hashimoto, Jiro Hirokawa, Makoto Ando
2010 J jnl
Connected Post-Wall (C-PW) Waveguide for Efficient Design of Broad Wall Slots by Using Equivalent Solid-Wall Waveguide.
IEICE Trans. Electron.
Jae-Ho Lee, Kimio Sakurai, Jiro Hirokawa, Makoto Ando
2010 J jnl
Design of Narrow Wall Windows in a Waveguide to Feed Partially-Dielectric-Filled Oversized-Rectangular Waveguide Based on 2-Dimensional Analyses of Two Orthogonal Directions.
IEICE Trans. Commun.
Miroslav Samardzija, Jiro Hirokawa, Makoto Ando
2010 J jnl
Design of Post-Wall Feed Waveguide for a Parallel Plate Slot Array by an Analysis Model with Corrected Solid-Walls.
IEICE Trans. Commun.
Koh Hashimoto, Jiro Hirokawa, Makoto Ando
2010 J jnl
Design of a Partially-Corporate Feed Double-Layer Slotted Waveguide Array Antenna in 39 GHz Band and Fabrication by Diffusion Bonding of Laminated Thin Metal Plates.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2009 J jnl
Analysis and Design of a Reflection-Cancelling Transverse Slot-Pair Array with Grating-Lobe Suppressing Baffles.
IEICE Trans. Commun.
Takehito Suzuki, Jiro Hirokawa, Makoto Ando
2009 J jnl
Analysis and Uniform Design of a Single-Layer Slotted Waveguide Array Antenna with Baffles.
IEICE Trans. Commun.
Takehito Suzuki, Jiro Hirokawa, Makoto Ando
2009 J jnl
Bandwidth Enhancement of Aperture Feed by an Air Rectangular Cavity Backing in a LTCC Post-Wall Waveguide.
IEICE Trans. Electron.
JungAun Lee, Jiro Hirokawa, Makoto Ando
2009 J jnl
Evaluation of Effective Conductivity of Copper-Clad Dielectric Laminate Substrates in Millimeter-Wave Bands Using Whispering Gallery Mode Resonators.
IEICE Trans. Electron.
Thi Huong Tran, Yuanfeng She, Jiro Hirokawa, Kimio Sakurai, Yoshinori Kogami, Makoto Ando
2008 J jnl
A Lightweight Radial Line Slot Antenna with Honeycomb Structure for Space Use.
IEICE Trans. Commun.
Hideki Ueda, Jiro Hirokawa, Makoto Ando, Osamu Amano, Yukio Kamata
2008 J jnl
Fabrication of Alternating-Phase Fed Single-Layer Slotted Waveguide Arrays Using Plastic Materials with Metal-Plating.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2008 J jnl
Step Width Tolerable for Offset of the Aperture in a Millimeter-Wave Transducer between Post-Wall and Hollow Standard Waveguides.
IEICE Trans. Electron.
JungAun Lee, Jiro Hirokawa, Makoto Ando
2008 J jnl
The Ridged Cross-Junction Multiple-Way Power Divider for Small Blockage and Symmetrical Slot Arrangement in the Center Feed Single-Layer Slotted Waveguide Array.
IEICE Trans. Commun.
Yasuhiro Tsunemitsu, Goro Yoshida, Naohisa Goto, Jiro Hirokawa, Makoto Ando
2007 J jnl
A Cost-Effective Transition between a Microstrip Line and a Post-Wall Waveguide Using a Laminated LTCC Substrate in 60-GHz Band.
IEICE Trans. Electron.
Takafumi Kai, Jiro Hirokawa, Makoto Ando, Hiroshi Nakano, Yasutake Hirachi
2007 J jnl
Moment Method Analysis of a Plane Wave Generator in an Oversized Rectangular Waveguide.
IEICE Trans. Commun.
Takafumi Kai, Jiro Hirokawa, Makoto Ando
2006 J jnl
A Coaxial Line to Post-Wall Waveguide Transition for a Cost-Effective Transformer between a RF-Device and a Planar Slot-Array Antenna in 60-GHz Band.
IEICE Trans. Commun.
Takafumi Kai, Yusuke Katou, Jiro Hirokawa, Makoto Ando, Hiroshi Nakano, Yasutake Hirachi
2006 J jnl
A Single-Layer Hollow-Waveguide 8-Way Butler Matrix.
IEICE Trans. Electron.
Shin-ichi Yamamoto, Jiro Hirokawa, Makoto Ando
2006 J jnl
Coupling of a circularly polarized slot pair on a corrugated waveguide of finite length.
IEICE Electron. Express
Kei Sato, Jiro Hirokawa, Kaoru Sudo, Makoto Ando
2006 J jnl
Design of 1 m
IEICE Trans. Commun.
Takuichi Hirano, Kimio Sakurai, Jiro Hirokawa, Makoto Ando, Tetsuya Ide, Atsushi Sasaki, Kazufumi Azuma, Yukihiko Nakata
2006 J jnl
Feasibility of mechanical beam scan by movable dielectric blocks in the feeder of a single-layer waveguide array antenna.
IEICE Electron. Express
Toshinori Kondo, Jiro Hirokawa, Kimio Sakurai, Makoto Ando
2005 J jnl
A Design of a Leaky Waveguide Crossed-Slot Linear Array with a Matching Element by the Method of Moments with Numerical-Eigenmode Basis Functions.
IEICE Trans. Commun.
Takuichi Hirano, Jiro Hirokawa, Makoto Ando
2005 J jnl
A Half-Sized Post-Wall Short-Slot Directional Coupler with Hollow Rectangular Holes in a Dielectric Substrate.
IEICE Trans. Electron.
Shin-ichi Yamamoto, Jiro Hirokawa, Makoto Ando
2005 J jnl
A Post-Wall Waveguide Slot Array with a Three-Way Power Divider on a Single-Layer Dielectric Substrate.
IEICE Trans. Commun.
Shin-ichi Yamamoto, Nozomu Hikino, Jiro Hirokawa, Makoto Ando
2005 J jnl
A Three-Way Divider for Partially-Corporate Feed in an Alternating Phase-Fed Single-Layer Slotted Waveguide Array.
IEICE Trans. Commun.
Miao Zhang, Jiro Hirokawa, Makoto Ando
2005 J jnl
A Waveguide Broad-Wall Transverse Slot Linear Array with Reflection-Canceling Inductive Posts and Grating-Lobe Suppressing Parasitic Dipoles.
IEICE Trans. Electron.
M. G. Sorwar Hossain, Jiro Hirokawa, Makoto Ando
2005 J jnl
An Alternating-Phase Fed Single-Layer Slotted Waveguide Array in 76 GHz Band and Its Sidelobe Suppression.
IEICE Trans. Electron.
Yuichi Kimura, Masanari Takahashi, Jiro Hirokawa, Makoto Ando, Misao Haneishi
2005 J jnl
Feed through an Aperture to a Post-Wall Waveguide with Step Structure.
IEICE Trans. Commun.
Takafumi Kai, Jiro Hirokawa, Makoto Ando
2005 J jnl
Grating Lobes Suppression in Transverse Slot Linear Array with a Dual Parasitic Beam of Strip Dipoles.
IEICE Trans. Commun.
M. G. Sorwar Hossain, Jiro Hirokawa, Makoto Ando
2005 J jnl
Reflection Characteristics of Center-Feed Single-Layer Waveguide Arrays.
IEICE Trans. Commun.
Yasuhiro Tsunemitsu, Sehyun Park, Jiro Hirokawa, Makoto Ando, Yohei Miura, Yasuhiro Kazama, Naohisa Goto
2004 J jnl
Circularly Polarized Post-wall Waveguide Slotted Arrays.
IEICE Electron. Express
Hisahiro Kai, Jiro Hirokawa, Makoto Ando