MURAKAMI YASUTAKA
| Department of Computer and Network Engineering | Assistant Professor |
| Cluster II (Emerging Multi-interdisciplinary Engineering) | Assistant Professor |
Researcher Information
Field Of Study
Career
- Nov. 2021 - Present
The University of Electro-Communications, 情報理工学研究科, 助教, Japan - Apr. 2019 - Oct. 2021
National Institute of Information and Communications Technology, 電磁波研究所 電磁環境研究室, 研究員, Japan - Jul. 2016 - Mar. 2019
Tokyo University of Agriculture and Technology, 工学府, 特任助教, Japan - Oct. 2015 - Mar. 2016
University of FUKUI, 工学研究科, 特命助教, Japan
Member History
- Jun. 2024 - Present
The Technical Committee on Microwaves, The Institute of Electronics, Information and Communication Engineers, Society - Jun. 2022 - Present
Technical Committee on Circuits and Systems (CAS), The Institute of Electronics, Information and Communication Engineers - Jun. 2021 - Present
Editorial Committee on the magazine of IEICE, The Institute of Electronics, Information and Communication Engineers - Mar. 2023 - Dec. 2023
AWS(アドバンスワイヤレスシリーズ)ワークショップ実行委員会 委員, 電子情報通信学会 アンテナ・伝播研究会
Research Activity Information
Award
Paper
- Reflection Phase Control Using a Transparent Metasurface with a Cross-Mesh Structure
Yasutaka Murakami; Naoki Hirasawa; Atsushi Minegishi; Katsuhiko Hosokawa; Ichiro Sudo; Hayato Hyakutake
Lead, 2024 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM), IEEE, 1-3, 10 Jul. 2024
International conference proceedings, English - Metasurface from the Angle of View of Antenna and Propagation Researchers and Its Angle of Departure
村田健太郎; 村上靖宜; 久世竜司
通信ソサイエティマガジン, 18, 2, 2024 - Optimization and Performance of Metamaterial- Based Electromagnetic Scattering Sheet for Coverage Improvement in 28 GHz Band
Yasutaka Murakami; Jerdvisanop Chakarothai; Lira Hamada; Katsumi Fujii
Lead, IEEE Access, Institute of Electrical and Electronics Engineers (IEEE), 12, 17090-17101, Jan. 2024, Peer-reviwed
Scientific journal, English - Intensity-dependent Temperature Rise Induced by Local Exposure to 26.5 GHz Quasi-Millimeter-Wave in Rat
ETSUKO IJIMA; KUN LI; TAKASHI HIKAGE; AKIKO NAGAI; YASUTAKA MURAKAMI; TAKUJI ARIMA; TATSUYA ISHITAKE; HIROSHI MASUDA
In Vivo, Anticancer Research USA Inc., 37, 5, 2092-2099, 31 Aug. 2023
Scientific journal - Electromagnetic diffusion of a wall with modified checkerboard pattern
Murakami Yasutaka; Chakarothai Jerdvisanop; Fujii Katsumi
IEICE Communications Express, The Institute of Electronics, Information and Communication Engineers, 11, 1, 58-63, 01 Jan. 2022, Recently, fifth-generation (5G) wireless communication systems have been spreading rapidly, and 5G mobile phone services started in 2020 in Japan. 5G wireless communication systems can provide not only greater capacities and higher speeds, but also ultrahigh-reliability, low latency, and multi-connectivity. Electromagnetic (EM) waves in the 28GHz band are also used for 5G communications. At such high frequencies, only a few paths can reach a receiving antenna, owing to the high propagation loss and high directivity of antennas used. Consequently, when an obstacle, such as office partitions, exists in a room, the quality of wireless communications deteriorates abruptly in the blocked region. In this paper, we confirm the improvement in the diffusion characteristics of an EM scattering wall with a modified checkerboard pattern. We design and optimize an EM scattering wall that exhibits a wide EM diffusion characteristic for both TE and TM polarizations of incident fields.
English - Improvement of em Diffusion Performance of Checkerboard Structure in 28 GHz Band
Yasutaka Murakami; Jerdvisanop Chakarothai; Katsumi Fujii
2021 Joint IEEE International Symposium on Electromagnetic Compatibility Signal and Power Integrity, and EMC Europe, EMC/SI/PI/EMC Europe 2021, Institute of Electrical and Electronics Engineers Inc., 249, 26 Jul. 2021, Recently, 5G wireless communications system has been deployed in 28 GHz band. Due to high propagation loss of EM waves, there are few paths which can reach receiving antenna when a blockage exists. In order to increase number of propagation paths and increase EM coverage for the system, checkerboard structures for diffusing EM waves emitted from transmitting antenna has been designed. The EM diffusion performance for different number of scattering elements was numerically evaluated and it was found that EM diffusion performance can be significantly improved by inverting the reflection phase of one element in the checkerboard pattern.
International conference proceedings, English - Design of an Electromagnetic Scattering Wall Applying Array Antenna Theory
Yasutaka Murakami; Jerdvisanop Chakarothai; Katsumi Fujii
Proceedings of the 2020 International Symposium on Electromagnetic Compatibility - EMC EUROPE, EMC EUROPE 2020, 23 Sep. 2020, © 2020 IEEE. 5G mobile communication systems use electromagnetic (EM) waves in the 28 GHz. The EM waves are scattered in a specular direction with sharp beam width by walls and radio waves in this frequency band is large propagation loss. If there are object for shielding EM waves between the receiver and transmitter inside the room, the quality of the wireless communication systems is deteriorated because of the received antenna can receive neither direct waves, reflected nor scattered waves. In this research, an EM scattering wall will be designed on the basic of array antenna theory to reduce unreachable area and to improve the quality of wireless communications in the room. Finally, the performance of the designed EM scattering wall is evaluated in terms of diffusion coefficients.
International conference proceedings - Design of electromagnetic scattering wall using genetic algorithm
Murakami Yasutaka; Chakarothai Jerdvisanop; Fujii Katsumi
IEICE Communications Express, The Institute of Electronics, Information and Communication Engineers, 2020, Peer-reviwed,5G wireless communications use electromagnetic (EM) waves in the 28 GHz band, and the EM waves radiated from high-directivity (gain) antennas are hence scattered in a specular direction by walls. If there are obstructions between the transmitting and receiving antennas, the wireless communication quality is deteriorated since the receiver can receive neither direct waves nor reflected waves. In this paper, an EM scattering wall is designed by applying array antenna theory to improve the wireless communication quality. Moreover, the optimum configuration of the EM scattering wall is designed by using the genetic algorithm without a large amount of calculation by an EM simulator.
English - Shorted patch antenna for 26.5 GHz electromagnetic wave local exposure system for animal experiments
Takuji Arima; Yasutaka Murakami; Toru Uno
2019 URSI Asia-Pacific Radio Science Conference, AP-RASC 2019, Institute of Electrical and Electronics Engineers Inc., 01 Mar. 2019, In recent year, 5th-generation mobile communication system is developed. In the system, 24-28 [GHz] frequency will be used. Mobile devices such as smartphone are used in the vicinity of a head in a talking mode
therefore, some EM wave exposure to a human head will be localized. In order to evaluate the positive effect of human health, animal experimental studies are necessary. In order to realize local exposure during smartphone using for the animal experiments, local exposure antennas[1][2] are required. In this research, local exposure antenna is proposed. The working frequency of this research is 26.5 [GHz].
International conference proceedings, English - Open-Ended Coaxial Line Probe for Local Exposure at 26.5 GHz
Yasutaka Murakami; Toru Uno; Takuji Arima
ISAP 2018 - 2018 International Symposium on Antennas and Propagation, Institute of Electrical and Electronics Engineers Inc., 25 Jan. 2019, In this research, new local electromagnetic field exposure open-ended coaxial line probe is proposed. The proposed probe places just above target area located in the brain. In order to evaluate the characteristics, configuration of probe where the reflection coefficient satisfies -10dB or loss at 26.5GHz is clarified and evaluated by using the localization. From examining the finding, it is found that developed probe has high localization of 600 or more. Since the developed probe has the high SAR target, it can be said that it has the efficiency exposure to the target area.
International conference proceedings, English - Localized electric field generating for rats head using a patch antenna in 26.5 GHz band
Higashibata Sousuke; Murakami Yasutaka; Arima Takuji; Uno Toru
IEICE Communications Express, The Institute of Electronics, Information and Communication Engineers, 8, 8, 359-362, 2019,In this paper, two types of patch antenna that can be used for animal experiments are proposed.
The proposed antenna can generate a localized electric field at the head of the rat. The operating frequency of the system is 26.5 GHz. This frequency is used the fifth generation of mobile communication (5G). The localization of the electric field is evaluated by the ratio between target area filed and whole body field.
English - Development of Antenna for Local Exposure of Small Animal in 26.5 GHz Band
Sousuke Higashibata; Toru Uno; Takuji Arima; Yasutaka Murakami
2018 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition, iWEM 2018, Institute of Electrical and Electronics Engineers Inc., 14 Nov. 2018, We propose a patch antenna for animal experiments. The proposed devise is operated with the fifth generation of mobile communication at 26.5 GHz. In this study, we consider the target exposure area to be a superficial of a rat brain. Then, we verify the effectives of the proposed antenna for local exposure by simulation analysis.
International conference proceedings, English - EM Wave exposure antenna for animal experiments in 26.5 GHz
Takuji Arima; Yasutaka Murakami; Toru Uno
2018 IEEE Conference on Antenna Measurements and Applications, CAMA 2018, Institute of Electrical and Electronics Engineers Inc., 09 Nov. 2018, In this days, the next generation wireless communication system such as 5th generation mobile communication is developed. In the system, higher frequency band such as 28 GHz will be used. On the other hand, mobile devices such as smartphone are used in the vicinity of a head in a talking mode, therefore, some EM wave exposure to a human head will be local exposure. In order to evaluate the positive effecton human health, an animal experimental study is necessary. In order to realize local exposure during mobile phone using for the animal experiment, an EM wave local exposure antenna is required. In the animal experiments, electromagnetic wave energy absorption should be focused on a head region of laboratory small animals. In this paper, our developed local exposure system including an antenna for the animal experiment is reported. The working frequency of this system is 26.5 GHz.
International conference proceedings, English
MISC
- 通信品質改善とEMC 電波散乱シートを用いた通信品質改善
村上靖宜
2023, 電磁環境工学情報EMC, 35, 10, 0916-2275, 202302265866176897 - Experimental verification on expansion of communication area using electromagnetic scattering sheet
村上靖宜
2023, 電子情報通信学会大会講演論文集(CD-ROM), 2023, 1349-144X, 202302249092692857 - 〈5Gの電波の到達エリアを拡げる〉電波反射材の開発と応用展開 メタマテリアル電波散乱シートを用いた5Gの無線通信品質改善
村上靖宜
2023, 月刊Material Stage, 22, 10, 1346-3926, 202302278451727652 - Study on Topology Optimization of FSS Loaded Waveguide Slot Antenna
船木誠哉; 萓野良樹; 村上靖宜; 上芳夫; XIAO Fengchao; 伊藤桂一
2023, 電子情報通信学会技術研究報告(Web), 123, 215(EMCJ2023 35-71), 2432-6380, 202402250011179274 - Design of Endfire Reectarrays Using Linear Elements
青木稜吾; 今野佳祐; CHEN Qiang; CHAKAROTHAI Jerdvisanop; 藤井勝巳; 村上靖宜
2022, 電子情報通信学会大会講演論文集(CD-ROM), 2022, 1349-144X, 202202216923372058 - Experimental verification on improvement of environment for radio wave propagation in 28 GHz band using electromagnetic scattering wall
村上靖宜; 村上靖宜; CHAKAROTHAI Jerdvisanop; 浜田リラ; 藤井勝巳
2022, 電子情報通信学会大会講演論文集(CD-ROM), 2022, 1349-144X, 202202244676054689 - Design of Electromagnetic Scattering Wall for Improvement of Wireless Communications Quality at 28 GHz
村上靖宜; 村上靖宜; CHAKAROTHAI Jerdvisanop; 浜田リラ; 藤井勝巳
2022, 電子情報通信学会技術研究報告(Web), 122, 42(WBS2022 1-16), 2432-6380, 202202263056242333 - Scattering Performance of Endfire Reflectarray With Linear Monopole Elements
青木稜吾; 今野佳祐; CHEN Qiang; CHAKAROTHAI Jerdvisanop; 藤井勝巳; 村上靖宜
2022, 電子情報通信学会技術研究報告(Web), 122, 214(AP2022 93-146), 2432-6380, 202202267900646296 - Scattering characteristics of an electromagnetic scattering wall which is constructed of metamaterial
村上靖宜; CHAKAROTHAI Jerdvisanop; 藤井勝巳
2020, 電子情報通信学会大会講演論文集(CD-ROM), 2020, 1349-144X, 202102259751191393 - アレーアンテナ理論に基づく28GHz帯の電波散乱壁の設計
村上靖宜; CHAKAROTHAI Jerdvisanop; 藤井勝巳
2019, 電子情報通信学会大会講演論文集(CD-ROM), 2019, 1349-144X, 201902286536326094 - 26.5GHz帯局所ばく露用開放型同軸プローブ
村上靖宜; 有馬卓司; 宇野亨
2018, 電子情報通信学会大会講演論文集(CD-ROM), 2018, 1349-144X, 201802210192099903 - 30GHz帯小動物局所ばく露用アンテナ
梅香家百夏; 村上靖宜; 宇野亨; 有馬卓司
2017, 電子情報通信学会大会講演論文集(CD-ROM), 2017, 1349-144X, 201702218661580631 - 誘電体基板を用いた人工磁気導体の低姿勢設計と帯域特性
村上靖宜; 堀俊和; 藤元美俊
2015, 電子情報通信学会論文誌 B(Web), J98-B, 2, 1881-0209, 201502217982346191 - AMC反射板付ダイポールアンテナのための反射板の最適構成
村上靖宜; 堀俊和; 藤元美俊
2015, 電子情報通信学会論文誌 B(Web), J98-B, 11, 1881-0209, 201502219453237348 - 部分円筒反射付ダイポールアンテナの利得
渡辺裕介; 村上靖宜; 堀俊和; 藤元美俊; 丸山珠美
2014, 電子情報通信学会大会講演論文集(CD-ROM), 2014, 1349-144X, 201402273772671723 - アンテナのビーム走査に適したメタサーフェス反射板の構成
村上靖宜; 堀俊和; 藤元美俊; 丸山珠美
2014, 電子情報通信学会大会講演論文集(CD-ROM), 2014, 1349-144X, 201402257673092180 - Configuration of Dipole Antenna with PMC Reflector
久世竜司; 村上靖宜; 堀俊和; 藤元美俊; 関卓也; 佐藤啓介; 大島一郎
2014, 電子情報通信学会技術研究報告, 114, 62(AP2014 19-39), 0913-5685, 201402205015744360 - 反射位相制御を用いたAMC反射板付アンテナの帯域特性
村上靖宜; 堀俊和; 藤元美俊
2014, 電子情報通信学会大会講演論文集(CD-ROM), 2014, 1349-144X, 201402251782379156 - 二層パッチ型FSSを用いた人工磁気導体の等価回路解析
久世竜司; 村上靖宜; 堀俊和; 藤元美俊; 関卓也; 佐藤啓介; 大島一郎
2013, 電子情報通信学会大会講演論文集, 2013, 1349-1369, 201302217284822513 - AMC反射板付ダイポールアンテナの最適配置範囲
村上靖宜; 堀俊和; 藤元美俊
2013, 電子情報通信学会大会講演論文集, 2013, 1349-1369, 201302243422837463 - Optimum Area of Arranged Unit Cell of Artificial Magnetic Conductor Reflector for Dipole Antenna
村上靖宜; 堀俊和; 藤元美俊
2013, 電子情報通信学会技術研究報告, 113, 192(AP2013 62-79), 0913-5685, 201302277389757949 - AMC反射板を用いた高利得ダイポールアンテナの最適構成
村上靖宜; 堀俊和; 藤元美俊
2013, 電子情報通信学会大会講演論文集(CD-ROM), 2013, 1349-144X, 201302255492215417 - アンテナ位置における位相差を考慮したAMC反射板の設計
村上靖宜; 堀俊和; 藤元美俊
2013, 電気関係学会北陸支部連合大会講演論文集(CD-ROM), 2013, 201402249816752221 - 損失を考慮したループ型人工磁気導体の設計法
村上靖宜; 堀俊和; 藤元美俊
2012, 電子情報通信学会大会講演論文集, 2012, 1349-1369, 201202216299331563 - Design Method of Loop-Slot type AMC with Loss Dielectric Substrate
村上靖宜; 堀俊和; 藤元美俊
2012, 電子情報通信学会技術研究報告, 111, 376(AP2011 146-184), 0913-5685, 201202241296508955 - AMC反射板付ダイポールアンテナの最適設計
村上靖宜; 堀俊和; 藤元美俊
2012, 電子情報通信学会大会講演論文集, 2012, 1349-1369, 201202229644371055 - Optimum AMC Reflector Configuration for Dipole Antenna with AMC Reflector
村上靖宜; 堀俊和; 藤元美俊
2012, 電子情報通信学会技術研究報告, 112, 285(AP2012 93-116), 0913-5685, 201302216549126712 - AMC反射板付ダイポールアンテナの最適配置法
村上靖宜; 堀俊和; 藤元美俊
2012, 電気関係学会北陸支部連合大会講演論文集(CD-ROM), 2012, 201302267643066212 - 誘電体層を用いたAMCの薄型設計
村上靖宜; 川上由紀; 堀俊和; 藤元美俊; 山口良; 長敬三
2011, 電子情報通信学会大会講演論文集, 2011, 1349-1369, 201102213369771977 - Bandwidth Characteristics of Artificial Magnetic Conductor with Dielectric Substrate
村上靖宜; 堀俊和; 川上由紀; 藤元美俊; 山口良; 長敬三
2011, 電子情報通信学会技術研究報告, 111, 29(AP2011 5-20), 0913-5685, 201102219744901172 - 損失性誘電体層を用いた人工磁気導体の設計法
村上靖宜; 堀俊和; 藤元美俊
2011, 電気関係学会北陸支部連合大会講演論文集(CD-ROM), 2011, 201102278614299272 - 損失性媒質を用いた人工磁気導体の設計法
村上靖宜; 堀俊和; 藤元美俊
2011, 電子情報通信学会大会講演論文集, 2011, 1349-1369, 201102244982309367 - Low-Profile Design of Loop Type AMC with Dielectric Substrate
村上靖宜; 堀俊和; 川上由紀; 藤元美俊; 山口良; 長敬三
2010, 電子情報通信学会技術研究報告, 110, 267(AP2010 91-117), 0913-5685, 201102209634595224
Books and other publications
Lectures, oral presentations, etc.
- Research on Transparent Metasurface Reflector with Cross-Mesh Structure
Yasutaka MURAKAMI,Naoki HIRASAWA,Atsushi MINEGISHI,Katsuhiko HOSOKAWA,Ichiro SUDO,Hayato HYAKUTAKE
Oral presentation, Japanese, 電子情報通信学会 アンテナ・伝播研究会
20 Sep. 2024
19 Sep. 2024- 20 Sep. 2024 - Scattering characteristics of metamaterial electromagnetic scattering sheet with protective layer
Yasutaka Murakami; Jerdvisanop Chakarothai; Lira Hamada; Katsumi Fujii
Japanese, 2024年 電子情報通信学会 ソサイエティ大会
13 Sep. 2024
10 Sep. 2024- 13 Sep. 2024 - Reflection phase characteristics of transparent metasurface using cross-mesh structure
Yasutaka Murakami; Naoki Hirasawa; Atsushi Minegishi; Katsuhiko Hosokawa; Ichiro Sudo; Hayato Hyakutake
Oral presentation, Japanese, 2024年 電子情報通信学会 総合大会
07 Mar. 2024
04 Mar. 2024- 08 Mar. 2024 - 導波管スロットアンテナに装荷するFSSのトポロジー最適化に関する検討
船木誠哉・萓野良樹・村上靖宜・上 芳夫・肖 鳳超(電通大)・伊藤桂一(秋田高専)
Oral presentation, Japanese, 電子情報通信学会 環境電磁工学研究会
20 Oct. 2023
19 Oct. 2023- 20 Oct. 2023 - Experimental verification on expansion of communication area using electromagnetic scattering sheet
Yasutaka Murakami
Oral presentation, Japanese, 2023年 電子情報通信学会 総合大会
09 Mar. 2023
07 Mar. 2023- 12 Mar. 2023 - Design of Electromagnetic Scattering Sheet for Improvement of Wireless Communications Quality at 28 GHz
Yasutaka Murakami
Nominated symposium, English, 2022 Asia-Pacific Microwave Conference (APMC 2022)
29 Nov. 2022
29 Nov. 2022- 02 Dec. 2022 - 線状モノポール素子を用いたエンドファイアリフレクトアレーの散乱特性
青木稜吾; 今野佳祐; 陳 強; 東; チャカロタイ ジェドヴィスノプ; 藤井勝巳(NI; 村上靖宜
Poster presentation, Japanese, 電子情報通信学会 アンテナ・伝播研究会
19 Oct. 2022 - 28GHz帯における無線通信品質改善のための電波散乱壁の設計
村上靖宜; チャカロタイ ジェドヴィスノプ; 浜田リラ; 藤井勝巳(NICT
Oral presentation, Japanese, 電子情報通信学会 環境電磁工学研究会
25 May 2022
Affiliated academic society
Research Themes
- Beyond 5Gの無線技術の基盤となるエンドファイアリフレクトアレーの創成
今野 佳祐; 藤井 勝巳; 陳 強; チャカロタイ ジェドヴィスノプ; 村上 靖宜
日本学術振興会, 科学研究費助成事業 基盤研究(C), 東北大学, 基盤研究(C), Coinvestigator, 22K04061
Apr. 2022 - Mar. 2026 - 電波散乱壁を用いた次世代高速無線通信の室内伝搬環境制御技術に関する研究
村上 靖宜
日本学術振興会, 科学研究費助成事業 若手研究, 若手研究, Principal investigator, 近年，超高速・超大容量通信の実現を目指して300 GHz帯を用いた無線通信の研究が行われており，電波の効率的利用のため室内において，特定領域外への放射を抑制するという需要や室内全体に電波を均一に到達させる技術に着目されている。 本研究では，電波を制御する電波散乱壁を部屋の天井や壁に配置し，室内で対象とする空間の電波伝搬環境を制御し，室内の無線通信品質の改善等を目指す． 本年度は，30GHz帯で試作したメタマテリアル電波散乱壁とシールドルーム内に建てた石膏ボードで囲まれた模擬居室を使用して，机・ロッカー等の什器を配置し，実際の環境模擬した環境で電波伝搬測定実験を行った．実験では，16QAMで変調した送信信号を電波散乱壁に反射させて受信した信号を受信器で復調できることが確認でき，信号誤り率(BER)を測定することで，メタマテリアル電波散乱壁の通信品質改善効果を明らかにした．測定の結果，比較として用いた同じ大きさの金属平板と比べ，メタマテリアル電波散乱壁を用いることで，電波の届かない領域に電波を到達させることができることを確認した．, 20K14744
Apr. 2020 - Mar. 2023
