SAKAKIBARA Kunio

写真a

Affiliation Department etc.

Department of Electrical and Mechanical Engineering
Department of Electrical and Mechanical Engineering

Title

Professor

Research Fields, Keywords

Antenna Engineering

Graduate School

  • 1993.04
    -
    1996.03

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Dept. of Electrical and Electronic EngineerinDoctor's Course  Completed

  • 1991.04
    -
    1993.03

    Tokyo Institute of Technology  Graduate School, Division of Science and Engineering  Dept. of Electrical and Electronic EngineerinMaster's Course  Completed

Degree

  • Tokyo Institute of Technology -  Doctor of Engineering

External Career

  • 2000.11
    -
    2001.05

    University of Ulm   Guest Researcher  

  • 1996.04
    -
    2002.09

    TOYOTA Central Research and Development Laboratories Inc.   Researcher  

Field of expertise (Grants-in-aid for Scientific Research classification)

  • Communication/Network engineering

 

Thesis for a degree

  • Study of Single Layer Slotted Waveguide Arrays

    榊原 久二男 

      1996.03

    8   1

Papers

  • Millimeter-wave Butler Matrix Beamforming Circuit using Finline in Double-layer Dielectric Substrate

    Nguyen Thanh Tuan, Kunio Sakakibara, Kojiro Iwasa, Takeshi Okunaga, Nobuyoshi Kikuma, and Yoshiki Sugimoto

    IEEE Open Journal of Antennas and Propagation ( IEEE )  1   579 - 589   2020.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    This article presents a new kind of finline in double-layer dielectric substrate and its beamforming circuit of Butler matrix in the millimeter-wave band. The finline is constructed by inserting a slotline between two dielectric substrate layers. In this configuration, it is bounded within a closed structure composed of a double-layer dielectric substrate and two rows of via-hole arrangement, contributing to low dispersion and low radiation loss of the finline characteristics. The proposed finline design aims to provide a low-complexity and low-loss transmission line which is applied to the Butler matrix design. A 4×4 Butler matrix for 4 switchable beams is realized by using the finline in the double-layer dielectric substrate. In addition, a waveguide-to-finline transition is developed as a feeding circuit for the Butler matrix. Characteristics of the proposed transition and the Butler matrix were analyzed by electromagnetic analysis of the finite element method and demonstrated by experiments at 79 GHz. The proposed Butler matrix obtains a wideband characteristic and an acceptable insertion loss of 2.42 dB. The array factor which is calculated from the measured amplitude and phase outputs 4 switchable beams with the beam directions of +14°, −46.5°, +46.5° and −14°, respectively. The proposed beamforming circuit using finline in double-layer dielectric substrate would be attractive for millimeter-wave applications due to its performance and low cost.

  • Bandwidth Extension of Planar Microstrip-to-Waveguide Transition by Controlling Transmission Modes Through Via-Hole Positioning in Millimeter-Wave Band

    Nguyen Thanh Tuan, Kunio Sakakibara, Nobuyoshi Kikuma

    IEEE Access ( IEEE )  7   161385 - 161393   2019.11  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Millimeter-Wave Topside Waveguide-to-Microstrip Transition in Multilayer Substrate

    Yuki Ishikawa, Kunio Sakakibara, Yuta Suzuki, Nobuyoshi Kikuma

    IEEE Microwave and Wireless Components Letters ( IEEE )  28 ( 5 ) 380 - 382   2018.03  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    A topside waveguide-to-microstrip transition whose waveguide sits on the top of the substrate was developed in the millimeter-wave band. A double-layer substrate was attached at the WR-10 waveguide end. A coupling patch is located on the top surface with spacing of the upper substrate thickness from the microstrip signal line patterned between the upper and the lower substrates. The transmission characteristics of the transition are controlled by the dimensions of the coupling patch and the insertion length of the microstrip signal line into the waveguide. All the dimensions of the transition were optimized by electromagnetic analysis of the finite-element method at 76.5 GHz. The feasibility was confirmed by experiments in this letter.

  • Effect of Wall-Surrounded Slot on Stepped Narrow Wall for Bandwidth Enhancement of Partially Parallel-Feeding Waveguide Traveling-Wave Array

    Yuichi Hirayama, Kunio Sakakibara, Haruki Umemura, Katsuhiro Miyazaki, Nobuyoshi Kikuma

    IEEE Transactions on Antennas and Propagation   65 ( 8 ) 3976 - 3985   2017.05  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • RF Performance of Layer-Structured Broadband Passive Millimeter-Wave Imaging System

    Kunio Sakakibara, Kunihiko Ohkawa, Yutaka Aoki, and Nobuyoshi Kikuma

    International Journal of Antennas and Propagation ( Hindawi Publishing Corporation )  2016   2015.12  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    Low profile and simple configuration are advantageous for RF module in passive millimeter-wave imaging system. High sensitivity over broad operation bandwidth is also necessary to detect right information from weak signal. We propose a broadband layer-structured module with low profile, simple structure, and ease of manufacture. This module is composed of a lens antenna and a detector module that consists of a detector circuit and a broadband microstrip-to-waveguide transition. The module forms a layer structure as a printed substrate with detector circuit is fixed between two metal plates with horn antennas and back-short waveguides. We developed a broadband passive millimeter-wave imaging module composed of a lens antenna and a detector module in this work. The gain and the antenna efficiency were measured, and the broadband operation was observed for the lens antenna. For the detector module, peak sensitivity was 8100 V/W. Furthermore, the detector module recognized a difference in the absorber’s temperature. The designs of the lens antenna and the detector module are presented and the RF performances of these components are reported. Finally, passive millimeter-wave imaging of a car, a human, and a metal plate in clothes is demonstrated in this paper.

  • Low-Sidelobe Design of Microstrip Comb-Line Antennas Using Stub-Integrated Radiating Elements in the Millimeter-Wave Band

    S. Sugawa, K. Sakakibara, N. Kikuma, H. Hirayama

    IEEE Transactions on Antennas and Propagation   60 ( 10 ) 4699 - 4709   2012.10  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    A novel radiating element with a matching circuit was developed for comb-line antennas of traveling-wave operation. In the design of low-sidelobe traveling-wave array antennas, large coupling is required for array elements of the comb-line antenna around the input port. Furthermore, the traveling-wave arrays, whose number of elements is small, also require large coupling because the radiation power for each array element is assigned to be much larger. However, wide radiating elements for large coupling perform poor impedance matching characteristics and radiate large cross polarization. Thus, we proposed a novel radiating element with matching stub in parallel to the radiating element to realize strong radiating power, low reflection, and low cross-polarization, simultaneously. The simulated and measured performances of low-sidelobe 14-element and 6-element antennas were demonstrated in this paper.

  • Broadband Millimeter-Wave Microstrip Comb-Line Antenna Using Corporate Feeding System with Center-Connecting

    A. Kunita, K. Sakakibara, N. Kikuma, and H. Hirayama

    IEICE Transactions on Communications   E95-B ( 1 ) 41 - 50   2012.01  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Millimeter-Wave Microstrip-Line-Fed Broadband Waveguide Aperture Antennas

    S. Yano, K. Sakakibara, N. Kikuma, and H. Hirayama

    IEICE Transactions on Communications   E95-B ( 1 ) 34 - 40   2012.01  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Transition from Waveguide to Two Microstrip Lines with Slot Radiators in the Millimeter-Wave Band

    Kazuyuki Seo, Kunio Sakakibara, Nobuyoshi Kikuma

    IEICE Transactions on Communications   E94-B ( 5 ) 1184 - 1193   2011.05  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

  • Millimeter-wave Microstrip Comb-line Antenna Using Reflection-canceling Slit Structure

    Y. Hayashi, K. Sakakibara, M. Nanjo, S. Sugawa, N. Kikuma, and H. Hirayama

    IEEE Transactions on Antennas and Propagation   59 ( 2 ) 398 - 406   2011.02  [Refereed]

    Research paper (scientific journal)   Multiple Authorship

    A microstrip comb-line antenna is developed in the millimeter-wave band. When the element spacing is one guide wavelength for the broadside beam in the traveling-wave excitation, reflections from all the radiating elements are synthesized in phase. Therefore, the return loss increases significantly. Furthermore, re-radiation from elements due to the reflection wave degrades the design accuracy for the required radiation pattern. We propose the way to improve the reflection characteristic of the antenna with arbitrary beam directions including strictly a broadside direction. To suppress the reflection, we propose a reflection-canceling slit structure installed on the feeding line around each radiating element. A 27-element linear array antenna with a broadside beam is developed at 76.5 GHz. To confirm the feasibility of the simple design procedure, the performance is evaluated through the measurement in the millimeter-wave band.

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Books

  • Millimeter-wave Application Technologies

    (Part: Supervision Book )

    S&T Publishing Inc.  2018.08 ISBN: 978-4-907002-73-2

  • Microwave and Millimeter Wave Technology

    Igor Minin 他 (Part: Multiple Authorship )

    InTech  2010.03 ISBN: 978-953-7619-66-4

  • Radar Technology

    Guy Kouemou 他 (Part: Multiple Authorship )

    In-Tech  2009.12 ISBN: 978-953-307-029-2

Presentations

  • Recent development of beam-scanning antenna technologies and implementations for automotive radar systems in millimeter-wave band and above

    Kunio SAKAKIBARA  [Invited]

    2021 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting  2021.12  -  2021.12  IEEE AP-S

  • Ripple suppression in 300GHz band cylindrical lens

    Derek GRAY, Kunio SAKAKIBARA, Shuya SUZUKI, Ryota ISHIHARA, Yoshiki SUGIMOTO, Nobuyoshi KIKUMA

    2021 IEEE AP-S Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting  2021.12  -  2021.12  IEEE AP-S

  • mm-wave and THz-wave Beam-scanning Antenna Technologies for Automotive Radars and beyond 5G Mobile Communication Systems

    Kunio Sakakibara  [Invited]

    2021 7th International Conference on Space Science and Communications (IconSpace2021)  (Kuala Lumpur, Malaysia)  2021.11  -  2021.11 

  • Effect of E-plane end shape on ripple suppression and focal arc of 300GHz band cylindrical lens

    Derek GRAY, Kunio SAKAKIBARA

    2021 International Symposium on Antennas and Propagation (ISAP2021)  (Taipei, Taiwan)  2021.10  -  2021.10  電子情報通信学会

  • Millimeter-wave and Teraherz-wave Beam-scanning Antenna Technologies for Automotive Radars and beyond 5G Mobile Communication Systems

    Kunio Sakakibara  [Invited]

    Millimeter-wave and Teraherz-wave Beam-scanning Antenna Technologies for Automotive Radars and beyond 5G Mobile Communication Systems  (Ho Chi Minh City, Vietnam)  2021.10  -  2021.10 

  • Performance Comparison of Lens Antenna Arrays Depending on the Lens Shaping Designs

    Bazilah Baharom, Yoshiki Sugimoto, Kunio Sakakibara, Akira Yamano, Nobuyoshi Kikuma

    電子情報通信学会 アンテナ伝搬研究会  (オンライン)  2021.07  -  2021.07  電子情報通信学会

  • A 258-GHz CMOS Transmitter with Phase-Shifting Architecture for Phased-Array Systems

    Toyoyuki Hagiwara, Natsu Yamaki, Koki Sekine, Hajime Sakai, Kenta Sahara, Kyoya Takano, Shinsuke Hara, Sangyeop Lee, Ruibing Dong, Satoru Tanoi, Shunichi Kubo, Satoshi Miura, Akifumi Kasamatsu, Takeshi Yoshida, Shuhei Amakawa, Kunio Sakakibara, Yohtaro Umeda, Minoru Fujishima

    2021 IEEE/MTT-S International Microwave Symposium - IMS 2021  (Atlanta, GA, USA)  2021.06  -  2021.06  IEEE MTT-S

  • Measured Performance of High Gain Dielectric Lens Antenna in 300 GHz Band

    石原僚太,榊原久二男,菊間信良,杉本義喜,山田吉英,ヌルル フダ アブドゥ ラーマン

    2020 International Symposium on Antennas and Propagation (ISAP2020)  (大阪)  2021.01  -  2021.01  電子情報通信学会

  • Design of Meta-Surface to Reduce Reflection Loss of Multi-Layer Dielectric Plate by Deriving Optimum Equivalent Circuit in Transmission Line Model

    Kunio Sakakibara  [Invited]

    2020 Asia-Pacific Microwave Conference (APMC2020)  (Hong Kong)  2020.12  -  2020.12 

  • Design of Broadband Transition from Hollow Waveguide to Differential Line on Multi-layer Dielectric Substrates

    鞠山匠汰,榊原久二男,菊間信良,杉本義喜

    2020 International Conference on Emerging Technologies for Communications (ICETC2020)  (オンライン)  2020.12  -  2020.12  電子情報通信学会

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Academic Activity

  • 2016.12
    -
    Now

    Institute of Electrical and Electronics Engineering  

  • 2009.01
    -
    2010.12

    Institute of Electrical and Electronics Engineering   IEEE APS Nagoya Chapter Treasurer

  • 2007.01
    -
    2008.12

    Institute of Electrical and Electronics Engineering   IEEE APS Nagoya Chapter Secretary