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Gain Enhancement and Side-Lobe Suppression of an X-Band Dual-Polarized Deployable Mesh Reflector Antenna Using a Symmetrical, Angle-Insensitive Reflective Metasurface 采用对称、角度不敏感反射超表面的x波段双偏振可展开网状反射面天线增益增强和旁瓣抑制
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0170
Liang-Yu Ou Yang;Hsueh-Yang Lin;Bingzhang Tsai
{"title":"Gain Enhancement and Side-Lobe Suppression of an X-Band Dual-Polarized Deployable Mesh Reflector Antenna Using a Symmetrical, Angle-Insensitive Reflective Metasurface","authors":"Liang-Yu Ou Yang;Hsueh-Yang Lin;Bingzhang Tsai","doi":"10.23919/comex.2024XBL0170","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0170","url":null,"abstract":"This paper presents a metasurface-loaded X-band dual-polarized deployable mesh reflector antenna with a high gain of 48 dBi and a low side-lobe level (SLL) of −32 dB. The proposed unit used to comprise the metasurface features structurally symmetric, angle-insensitive, and a smooth phase gradient. The architecture of the metasurface-loaded mesh reflector antenna is investigated in detail. A prototype experiment to demonstrate the focusing capability of such proposed metasurfaces is conducted. The simulation and measurement results are in good agreement and indicate this type of the proposed planar metasurface can effectively enhance the gain and suppress the SLL of the mesh reflector antenna. It is believed that the designed metasurface unit, as well as the metasurfaces formed by such units, has potential in the applications of large antennas for Low-Earth-Orbit (LEO) satellites.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"12-16"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751748","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938585","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Compact and Wideband Rectifier Using a Multi-Stage Type Matching Circuit for Microwave Wireless Power Transmission System 微波无线电力传输系统中采用多级匹配电路的小型宽带整流器
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0146
Takehiro Yamaki;Kodai Nakao;Satoshi Yoshida
{"title":"Compact and Wideband Rectifier Using a Multi-Stage Type Matching Circuit for Microwave Wireless Power Transmission System","authors":"Takehiro Yamaki;Kodai Nakao;Satoshi Yoshida","doi":"10.23919/comex.2024XBL0146","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0146","url":null,"abstract":"This paper proposes a compact microwave rectifier achieving a fractional bandwidth of 162.7% using a double-voltage rectification circuit. The impedance matching section was designed with lumped elements for miniaturization of the circuit. Moreover, the circuit configuration of the impedance matching section was multi-stage matching to realize the wideband characteristic. Theoretically, this wideband performance was achieved by reducing the impedance conversion ratio of the L-shaped circuit and shortening the impedance locus. The measured frequency bandwidth where the RF-DC conversion efficiency exceeds 50% was from 1.1 GHz to 10.7 GHz while the DC load resistance of 200 Ω, achieving a fractional bandwidth of 162.7%.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"34-37"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751759","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938579","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of Signal Separation and Demodulation Techniques Considering IQ Imbalance by Stored Data Batch Signal Processing 存储数据批处理中考虑IQ不平衡的信号分离解调技术研究
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0173
Yudai Mita;Yuta Hiraoka;Tomofumi Hikasa;Shigeru Tomisato;Satoshi Denno;Kazuhiro Uehara
{"title":"Study of Signal Separation and Demodulation Techniques Considering IQ Imbalance by Stored Data Batch Signal Processing","authors":"Yudai Mita;Yuta Hiraoka;Tomofumi Hikasa;Shigeru Tomisato;Satoshi Denno;Kazuhiro Uehara","doi":"10.23919/comex.2024XBL0173","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0173","url":null,"abstract":"With the arrival of the IoT era, the problem of interference has become even more serious, and the challenge is to establish techniques for separating and demodulating collide signals. To achieve this, we are conducting research on stored data batch signal processing technology using short-time Fourier transform (STFT). In this paper, we used a feature quantity demodulation method proposed as a method for stored data batch signal processing to evaluate the effect of IQ imbalance, which is a factor in signal degradation in the transmitter, on signal separation and demodulation performance. Furthermore, we proposed a receiver configuration that estimates the amount of degradation due to IQ imbalance from the extracted feature quantities and compensates for the signal degradation. Computer simulation results confirmed that the proposed compensation method can improve signal separation and demodulation performance when degraded by IQ imbalance.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"30-33"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751755","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938586","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Anomaly Detection Support for Crowdworkers by Providing Anomaly Scores 通过提供异常分数为众工提供异常检测支持
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0163
Tatsuki Tamano;Ryuya Itano;Honoka Tanitsu;Takahiro Koita
{"title":"Anomaly Detection Support for Crowdworkers by Providing Anomaly Scores","authors":"Tatsuki Tamano;Ryuya Itano;Honoka Tanitsu;Takahiro Koita","doi":"10.23919/comex.2024XBL0163","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0163","url":null,"abstract":"In recent years, crime clearance rates have remained low. To improve them, current methods have used deep learning and crowdsourcing to automatically detect crimes. However, these methods suffer from false positives and false negatives and also fail to achieve high accuracy (AUC, correct answer rate). This paper proposes a method that supports the judgments of crowdworkers by providing them with anomaly-score output from deep learning models. The proposed method enhance the number of correct judgments made by crowdworkers. As a result, false positive and false negative rates are reduced and accuracy is improved.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"8-11"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751757","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Reducing Temperature Rise in Metal Meshes Exposed to Incident Electromagnetic Waves through Regular Polygonal Unit Structure 正多边形单元结构降低入射电磁波下金属网的温升
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0128
Hidetoshi Makimura;Yuta Sugiyama;Kengo Nishimoto;Yoshio Inasawa
{"title":"Reducing Temperature Rise in Metal Meshes Exposed to Incident Electromagnetic Waves through Regular Polygonal Unit Structure","authors":"Hidetoshi Makimura;Yuta Sugiyama;Kengo Nishimoto;Yoshio Inasawa","doi":"10.23919/comex.2024XBL0128","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0128","url":null,"abstract":"This study investigated the thermal dynamics of conductive metal meshes under electromagnetic exposure to determine the correlation between the temperature rise observed in conductive metal meshes exposed to incident plane waves and the geometric configuration of the unit structure of the mesh. Multiphysics analysis conducted in this study demonstrated that a metal mesh characterized by narrow wire widths and short edges effectively mitigated the maximum temperature rise observed across the metal mesh despite maintaining equivalent sheet resistance. Furthermore, the results revealed that a metal mesh configured with regular hexagons could reduce the temperature rise by 3.7% and 2.2% compared with metal meshes composed of regular triangles and squares, respectively, and simultaneously maintained the sheet resistance and shielding effectiveness. The results of this study highlighted the significance of the unit structure shape in enhancing the thermal performance of conductive metal meshes and proposed a novel methodology for optimizing electromagnetic shielding structures.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"1-4"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751752","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938581","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Resonant Harmonic Reaction in Twin- and Quadruplet-Diode Rectifiers 双二极管和四极二极管整流器的谐振谐波反应
IF 0.3
IEICE Communications Express Pub Date : 2024-11-12 DOI: 10.23919/comex.2024XBL0179
Takashi Ohira
{"title":"Resonant Harmonic Reaction in Twin- and Quadruplet-Diode Rectifiers","authors":"Takashi Ohira","doi":"10.23919/comex.2024XBL0179","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0179","url":null,"abstract":"This study answers the basic question of whether a simple lumped-constant (LC) resonator works for harmonic reactions in diode rectifiers. To explore how the LC resonator generally reacts to harmonic waves, we present three typical diode rectifier topologies: double-voltage, double-current, and full-bridge. Through an algebraic circuit analysis of the diode's time-domain switching operation, we find that the second- and higher-order harmonic waves generated by the diodes are fully reflected by the LC resonator, return to the diodes, and are recycled for effective dc power generation. This outcome offers a simpler alternative solution for high-efficiency RF rectification than usual class-E and -F implementation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 1","pages":"17-21"},"PeriodicalIF":0.3,"publicationDate":"2024-11-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10751754","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142938583","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Image-Driven Reflection Pattern Selection for Standalone IRS Control 独立IRS控制的图像驱动反射模式选择
IF 0.3
IEICE Communications Express Pub Date : 2024-10-10 DOI: 10.23919/comex.2024XBL0155
Yoshihiko Tsuchiya;Norisato Suga;Kazunori Uruma;Masaya Fujisawa
{"title":"Image-Driven Reflection Pattern Selection for Standalone IRS Control","authors":"Yoshihiko Tsuchiya;Norisato Suga;Kazunori Uruma;Masaya Fujisawa","doi":"10.23919/comex.2024XBL0155","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0155","url":null,"abstract":"Intelligent reflecting surfaces (IRSs), which can dynamically control radio propagation, have attracted attention as devices for achieving non-line-of-sight communication under high-frequency bands. Channel estimation is required to control the IRSs, and the overhead of the estimation reduces the transmission efficiency. To remove channel estimation, control methods to predict reflection pattern candidates from image sensing are proposed. However, searching for the appropriate pattern among these candidates is necessary. This paper proposes an IRS control method that recognize users from camera images and selecting reflection patterns, thereby obviating channel estimation and reflection pattern search. Numerical experiments demonstrate that the proposed method realize accurate IRS control by only camera images.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 12","pages":"517-520"},"PeriodicalIF":0.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10713856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761475","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Overview of C-NAT and Its Reinforcement for IoT Data Exchange Platform 物联网数据交换平台C-NAT及其增强概述
IF 0.3
IEICE Communications Express Pub Date : 2024-10-10 DOI: 10.23919/comex.2024COL0012
Atsuko Yokotani;Horoshi Mineno;Masaki Mitsuuchi;Koichi Ishibashi;Tetsuya Yokotani
{"title":"Overview of C-NAT and Its Reinforcement for IoT Data Exchange Platform","authors":"Atsuko Yokotani;Horoshi Mineno;Masaki Mitsuuchi;Koichi Ishibashi;Tetsuya Yokotani","doi":"10.23919/comex.2024COL0012","DOIUrl":"https://doi.org/10.23919/comex.2024COL0012","url":null,"abstract":"IoT platforms have been actively discussed for deploying various IoT services using a horizontal approach. The IoT Data Exchange Platform (IoT-DEP) is one of these platforms, standardized as ISO/IEC 30161 series in ISO/IEC JTC 1/SC 41. These standardized documents specify the requirements, architecture, and functional blocks of the communication components. However, detailed communication sequences among the communication components are considered an implementation issue. This paper proposes a content-centric network with Network initiative And Traffic control (C-NAT) applied to the IoT-DEP as a promising candidate for communication sequences. Moreover, it proposes the reinforcement of C-NAT for low-latency and reliable industrial services when applied to IoT-DEP. Specifically, although the original C-NAT is intended to provide cyclic communication, this study proposes support for non-cyclic communication in reinforced C-NAT.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 12","pages":"492-495"},"PeriodicalIF":0.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10713855","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
2-Step Robust DNN Model for RSSI-Based Indoor Localization 基于rssi的2步鲁棒DNN模型室内定位
IF 0.3
IEICE Communications Express Pub Date : 2024-10-10 DOI: 10.23919/comex.2024XBL0165
Taisei Kosaka;Steven Wandale;Koichi Ichige
{"title":"2-Step Robust DNN Model for RSSI-Based Indoor Localization","authors":"Taisei Kosaka;Steven Wandale;Koichi Ichige","doi":"10.23919/comex.2024XBL0165","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0165","url":null,"abstract":"In this paper, we introduce a novel approach called the 2-Step Robust Deep Neural Network (DNN), designed specifically for indoor localization utilizing received signal strength indicator (RSSI) data. This method represents an advancement over the previously proposed 2-Step Extreme Gradient Boosting (XGBoost), aiming to enhance estimation precision by leveraging a single coordinate (\u0000<tex>$x$</tex>\u0000 or \u0000<tex>$y$</tex>\u0000) as a feature. The pivotal alterations involve transitioning from XGBoost to DNN and refining the training data to develop a resilient learning model for positional coordinates. Through comprehensive simulations, we demonstrate that the proposed 2-Step Robust DNN attains superior estimation accuracy while preserving the absence of constraints on the dataset.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"13 12","pages":"513-516"},"PeriodicalIF":0.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10713854","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142761426","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Study of MACKEY for Multi Band with Asymmetric Structure 多波段非对称结构的MACKEY研究
IF 0.3
IEICE Communications Express Pub Date : 2024-10-10 DOI: 10.23919/comex.2024ATL0008
Hayato Ide;Toru Fukasawa;Shimpei Akimoto;Shigeru Makino
{"title":"Study of MACKEY for Multi Band with Asymmetric Structure","authors":"Hayato Ide;Toru Fukasawa;Shimpei Akimoto;Shigeru Makino","doi":"10.23919/comex.2024ATL0008","DOIUrl":"https://doi.org/10.23919/comex.2024ATL0008","url":null,"abstract":"MACKEY (Meta-surface inspired Antenna Chip developed by KIT EOE Laboratory) has been proposed as a functional compact antenna that is not affected by surrounding metals. Parallel placement of two MACKEYs has also been proposed for Wi-Fi 2GHz and Wi-Fi 5GHz bands. However, the MACKEY parallel arrangement type has a large width Land requires two feeding points to excite each patch. In this report, we present the analysis and measurements results of the miniaturized multi frequency MACKEY, which is a modification of the conventional type for Wi-Fi 2GHz and Wi-Fi 5GHz bands.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"43-46"},"PeriodicalIF":0.3,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10713512","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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