Papers - SAKAKIBARA Kunio
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Broadband Connection of SIWs in Different Layers Using Back-Short Structures and Patch Element in 270-GHz Band Reviewed International coauthorship International journal
C. Chokchai, Y. Sugimoto, S. Kishi, K. Sakakibara and N. Kikuma
IEEE Transactions on Microwave Theory and Techniques 2024.11
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/TMTT.2024.3487753
DOI： 10.1109/TMTT.2024.3487753
Other Link： https://ieeexplore.ieee.org/document/10745564
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Broadband Back-Short Transition From Waveguide to Thin Substrate-Integrated Waveguide in Multilayer Substrate in 270-GHz Band Reviewed International coauthorship International journal
S. Kishi, Y. Sugimoto, K. Sakakibara and N. Kikuma
IEEE Journal of Microwaves 2024.11
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
Other Link： https://ieeexplore.ieee.org/document/10746389
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Broadband GCPW-to-Waveguide Transition in Multi-Layer Dielectric Substrates With Modified V-Shaped and Double Patch in 270 GHz Band Reviewed International coauthorship International journal
C. Chokchai, Y. Sugimoto, K. Sakakibara, M. Yamazaki, H. A. Diawuo and N. Kikuma
IEEE Journal of Microwaves 4 ( 3 ) 537 - 547 2024.07
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
Other Link： https://ieeexplore.ieee.org/document/10584085
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Broadband Waveguide-to-Differential-Line Transition in Multi-Layer Substrates With Triple Stacked Patch in 300 GHz Band Reviewed International journal
C. Chokchai, Y. Sugimoto, K. Sakakibara, H. A. Diawuo and N. Kikuma
IEEE Access 12 49804 - 49816 2024.04
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/ACCESS.2024.3384606
DOI： 10.1109/ACCESS.2024.3384606
Other Link： https://ieeexplore.ieee.org/document/10489975
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Best Feed Positions and Radiation Patterns of Typical Multibeam Dielectric Lens Antenna Reviewed International coauthorship International journal
M. Muhsin, K. Kamardin, Y. Yamada, Y. Sugimoto and K. Sakakibara
IEEE Access 12 10497 - 10511 2024.01
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/ACCESS.2024.3352132
DOI： 10.1109/ACCESS.2024.3352132
Other Link： https://ieeexplore.ieee.org/document/10387435
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2×2 Lens Array Antenna using Square-Bottom Concave-Convex Lens in 300-GHz Band Reviewed International coauthorship International journal
Bazilah Baharom, Yoshiki Sugimoto, Bakar Rohani, Kunio Sakakibara, Nobuyoshi Kikuma, Yoshihide Yamada, Nurul Huda Abd Rahman
IEEE Open Journal of Antennas and Propagation 4 1074 - 1086 2023.10
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/OJAP.2023.3325055
DOI： 10.1109/OJAP.2023.3325055
Other Link： https://ieeexplore.ieee.org/document/10287222
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Reduction of Surface Reflection on Dielectric Lens Antenna by Matching Periodic Square-Pillars in 300-GHz Band Reviewed International journal
Bazilah Baharom, Ryota Ishihara, Yoshiki Sugimoto, Kunio Sakakibara, Nobuyoshi Kikuma, Takayuki Arai, Takayoshi Suganuma, Tomohiro Saito
IEEE Access 11 8481 - 8491 2023.01
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/ACCESS.2023.3239397
DOI： 10.1109/ACCESS.2023.3239397
Other Link： https://ieeexplore.ieee.org/document/10024932
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Broadband Differential-Line-to-Waveguide Transition in Multi-Layer Dielectric Substrates With an X-Shaped Patch Element in 280 GHz Band Reviewed International journal
Makoto Yamazaki, Yoshiki Sugimoto, Kunio Sakakibara, Nobuyoshi Kikuma
IEEE Transactions on Microwave Theory and Techniques 71 ( 6 ) 2616 - 2624 2023.01
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/TMTT.2022.3232501
DOI： 10.1109/TMTT.2022.3232501
Other Link： https://ieeexplore.ieee.org/document/10008990
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A 76-Gbit/s 265-GHz CMOS Receiver With WR-3.4 Waveguide Interface Reviewed International journal
S. Hara, R. Dong, S. Lee, K. Takano, N. Toshida, A. Kasamatsu, K. Sakakibara, T. Yoshida, S. Amakawa, M. Fujishima
IEEE Journal of Solid-State Circuits 57 ( 10 ) 2988 - 2998 2022.10
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/JSSC.2022.3179560
DOI： 10.1109/JSSC.2022.3179560
Other Link： https://ieeexplore.ieee.org/document/9832950
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Far-Field Estimation Method of Antennas Above Conductive Plane Using a Partially Spherical Near-Field Reviewed International journal
Y. Sugimoto, H. Arai, K. Sakakibara and N. Kikuma
IEEE Transactions on Antennas and Propagation 72 ( 4 ) 3662 - 3669 2021.07
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
Other Link： https://ieeexplore.ieee.org/document/9490527
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Millimeter-wave Butler Matrix Beamforming Circuit using Finline in Double-layer Dielectric Substrate Reviewed International journal
IEEE Open Journal of Antennas and Propagation 1 579 - 589 2020.10
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
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 x 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 deg., -46.5 deg., +46.5 deg. and -14 deg., 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.
DOI： 10.1109/OJAP.2020.3029534
Other Link： https://ieeexplore.ieee.org/document/9217577
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Bandwidth Extension of Planar Microstrip-to-Waveguide Transition by Controlling Transmission Modes Through Via-Hole Positioning in Millimeter-Wave Band Reviewed International journal
Nguyen Thanh Tuan, Kunio Sakakibara, Nobuyoshi Kikuma
IEEE Access 7 161385 - 161393 2019.11
Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
DOI： 10.1109/ACCESS.2019.2952073
Other Link： https://ieeexplore.ieee.org/document/8894056
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Millimeter-Wave Topside Waveguide-to-Microstrip Transition in Multilayer Substrate Reviewed International journal
Yuki Ishikawa, Kunio Sakakibara, Yuta Suzuki, Nobuyoshi Kikuma
IEEE Microwave and Wireless Components Letters 28 ( 5 ) 380 - 382 2018.03
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE
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.
DOI： 10.1109/LMWC.2018.2812125
Other Link： https://ieeexplore.ieee.org/document/8320283
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Effect of Wall-Surrounded Slot on Stepped Narrow Wall for Bandwidth Enhancement of Partially Parallel-Feeding Waveguide Traveling-Wave Array Reviewed International journal
Yuichi Hirayama, Kunio Sakakibara, Haruki Umemura, Katsuhiro Miyazaki, Nobuyoshi Kikuma
IEEE Transactions on Antennas and Propagation 65 ( 8 ) 3976 - 3985 2017.05
Language：English Publishing type：Research paper (scientific journal)
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RF Performance of Layer-Structured Broadband Passive Millimeter-Wave Imaging System Reviewed International journal
Kunio Sakakibara, Kunihiko Ohkawa, Yutaka Aoki, and Nobuyoshi Kikuma
International Journal of Antennas and Propagation 2016 2015.12
Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Hindawi Publishing Corporation
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.
Other Link： http://dx.doi.org/10.1155/2016/6894676
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一層基板で構成された広帯域マイクロストリップ線路・クアッドリッジ導波管変換器 Reviewed
山田 康太，榊原 久二男，菊間 信良
電子情報通信学会 和文論文誌 B J98-B ( 3 ) 276 - 284 2015.03
Language：Japanese Publishing type：Research paper (scientific journal)
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直交偏波2帯域割り当てクアッドリッジホーンアンテナ Reviewed
山田 康太, 榊原 久二男, 菊間 信良, 荒川 孝, 坂本 徹, 武田 政宗
電子情報通信学会和文論文誌B J97-B ( ３ ) ３２４ - ３３２ 2014.03
Language：Japanese Publishing type：Research paper (scientific journal)
Other Link： http://search.ieice.org/bin/summary.php?id=j97-b_3_324&category=B&year=2014&lang=J
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Low-Sidelobe Design of Microstrip Comb-Line Antennas Using Stub-Integrated Radiating Elements in the Millimeter-Wave Band Reviewed
S. Sugawa, K. Sakakibara, N. Kikuma, H. Hirayama
IEEE Transactions on Antennas and Propagation 60 ( 10 ) 4699 - 4709 2012.10
Language：English Publishing type：Research paper (scientific journal)
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.
Other Link： https://ieeexplore.ieee.org/document/6236082
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Millimeter-Wave Microstrip-Line-Fed Broadband Waveguide Aperture Antennas Reviewed
S. Yano, K. Sakakibara, N. Kikuma, and H. Hirayama
IEICE Transactions on Communications E95-B ( 1 ) 34 - 40 2012.01
Language：English Publishing type：Research paper (scientific journal)
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A. Kunita, K. Sakakibara, N. Kikuma, and H. Hirayama
IEICE Transactions on Communications E95-B ( 1 ) 41 - 50 2012.01
Language：English Publishing type：Research paper (scientific journal)
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Transition from Waveguide to Two Microstrip Lines with Slot Radiators in the Millimeter-Wave Band Reviewed
Kazuyuki Seo, Kunio Sakakibara, Nobuyoshi Kikuma
IEICE Transactions on Communications E94-B ( 5 ) 1184 - 1193 2011.05
Language：English Publishing type：Research paper (scientific journal)
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Millimeter-wave Microstrip Comb-line Antenna Using Reflection-canceling Slit Structure Reviewed
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
Language：English Publishing type：Research paper (scientific journal)
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.
Other Link： https://ieeexplore.ieee.org/document/5648450
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メタマテリアルの種明かし Invited Reviewed
榊原久二男
電子情報通信学会通信ソサイエティマガジン 25 - 33 2010.12
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Narrow-Wall-Connected Microstrip-to-Waveguide Transition Using V-Shaped Patch Element in Millimeter-Wave Band Reviewed
K. Seo, K. Sakakibara, N. Kikuma
IEICE Transactions on Communications E93-B ( 10 ) 2523 - 2530 2010.10
Language：English Publishing type：Research paper (scientific journal)
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Narrow-Wall-Slotted Hollow-Waveguide Array Antenna Using Partially Parallel Feeding System in Millimeter-Wave Band Reviewed
Y. Ikeno, K. Sakakibara, N. Kikuma, H. Hirayama
IEICE Transactions on Communications E93-B ( 10 ) 2545 - 2553 2010.10
Language：English Publishing type：Research paper (scientific journal)
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Control of Power Dividing Ratio in Four-Way Power Divider for Feeding Microstrip Comb-Line Antenna Reviewed
Morihiko Nanjo, Kunio Sakakibara, Nobuyoshi Kikuma, Hiroshi Hirayama
IEICE Transactions on Communications E93-B ( 10 ) 2651 - 2654 2010.10
Language：English Publishing type：Research paper (scientific journal)
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進行波励振ミリ波平面アレーアンテナ Invited Reviewed
榊原久二男
電子情報通信学会論文誌 B分冊 J93-B ( 9 ) 1115 - 1126 2010.09
Authorship：Lead author Language：Japanese Publishing type：Research paper (scientific journal)
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Study of Single Layer Slotted Waveguide Arrays
榊原 久二男
1996.03
Language：English Publishing type：Doctoral thesis
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