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Vertically Polarized Omnidirectional Reflector Antenna Fed by a Circular Waveguide Bent TM01 Mode Converter for the 150 GHz Band 150 GHz波段垂直极化TM01弯模变换器全向反射天线
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025SPL0010
Jiro Hirokawa;Riki Yanagisawa;Takashi Tomura;Issei Watanabe
{"title":"Vertically Polarized Omnidirectional Reflector Antenna Fed by a Circular Waveguide Bent TM01 Mode Converter for the 150 GHz Band","authors":"Jiro Hirokawa;Riki Yanagisawa;Takashi Tomura;Issei Watanabe","doi":"10.23919/comex.2025SPL0010","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0010","url":null,"abstract":"A vertically polarized horizontal-plane omnidirectional antenna with a circular waveguide bent <tex>$text{TM}_{01}$</tex> mode converter and an axisymmetric single reflector is designed and fabricated for the 150 GHz band. Determining a frequency range of 147.8 GHz to 170.0 GHz as the operational band, where the transmission coefficient ratio of the <tex>$text{TE}_{11}$</tex> mode to the <tex>$text{TM}_{01}$</tex> mode is less than 1/3 that in the designed mode converter, the realized gain is 2.2 dBi to 8.8 dBi, and the angular gain variation at the measured frequencies in the band is 4.9 dB at the maximum in the fabricated antenna","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"218-221"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924596","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196565","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
Relationship Between Leaf Volume and Leaf Attenuation in Tree Shielding from 2.4 GHz to 15 GHz 2.4 GHz ~ 15 GHz树木屏蔽中叶片体积与叶片衰减的关系
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025SPL0011
Yoshiki Nakanishi;Yusuke Hata;Sigeo Gotoh;Hisato Iwai;Shinsuke Ibi
{"title":"Relationship Between Leaf Volume and Leaf Attenuation in Tree Shielding from 2.4 GHz to 15 GHz","authors":"Yoshiki Nakanishi;Yusuke Hata;Sigeo Gotoh;Hisato Iwai;Shinsuke Ibi","doi":"10.23919/comex.2025SPL0011","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0011","url":null,"abstract":"In this letter, the relationship between the amount of leaves and leaf attenuation was clarified. We conducted FDTD calculations and measurements for a tree species called Red Robin and within the frequency range of 2.4 GHz to 15 GHz. In addition, we confirmed that the amount of leaves is defined by the product of the density of leaves and the length of the propagation path within the leaf area. We also defined leaf attenuation per unit leaf volume as LAC (leaf attenuation coefficient) to use as an index to quantify the leaf attenuation and clarified its frequency characteristics.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"222-225"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924597","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196503","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
Equivalence of Two Types of Knife-Edge Diffraction Models to Predict Shadowing Effect 两种刀刃衍射模型预测阴影效应的等效性
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025XBL0021
Xin Du;Chechia Kang;Jun-Ichi Takada
{"title":"Equivalence of Two Types of Knife-Edge Diffraction Models to Predict Shadowing Effect","authors":"Xin Du;Chechia Kang;Jun-Ichi Takada","doi":"10.23919/comex.2025XBL0021","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0021","url":null,"abstract":"The knife-edge diffraction (KED) model has been widely used to predict the shadowing effect. In addition to the classical Fresnel KED model using the Fresnel integral, in recent years an alternative expression proposed by mobile and wireless communications enablers for the twenty-twenty information society (METIS), i.e., METIS KED model, has also been used. This letter proposes a mathematical derivation to rigorously prove that the METIS KED model can be seen as an approximated envelope of the Fresnel KED model. Simulated results agree with the proposal that the METIS KED model is identical to the Fresenl KED model with a low error of 0.19 dB in the shadowed region, and the METIS KED model can be seen as an approximated envelope of the Fresnel KED model with a negligible error of 0.01 dB in the lit region. In addition, based on the connection between the Fresnel and METIS KED models, we propose a threshold for the four-state piecewise linear modeling, which can satisfy the modeling of the shadowing effect at a specific frequency or environment and is the closed form.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"185-188"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924590","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896426","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
Enhancement of Loss Point Detection Accuracy by Double-Slope-Assisted Brillouin Optical Correlation-Domain Reflectometry 双斜率辅助布里渊光相关域反射法提高损耗点检测精度
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2024XBL0199
Yukihiro Suzuki;Yosuke Mizuno;Heeyoung Lee
{"title":"Enhancement of Loss Point Detection Accuracy by Double-Slope-Assisted Brillouin Optical Correlation-Domain Reflectometry","authors":"Yukihiro Suzuki;Yosuke Mizuno;Heeyoung Lee","doi":"10.23919/comex.2024XBL0199","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0199","url":null,"abstract":"We propose and experimentally demonstrate an improved method for detecting loss points in optical fibers using double-slope-assisted Brillouin optical correlation-domain reflectometry (DSA-BOCDR). By utilizing the power ratio of two frequencies with different shifts from the Brillouin frequency shift, we enhance the positional accuracy of loss point detection compared to conventional slope-assisted BOCDR (SA-BOCDR). Our results show that this method can effectively detect loss points with higher accuracy, contributing to the advancement of distributed optical fiber sensing technologies for structural health monitoring.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"167-169"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924588","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896332","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
Machine Learning-Based Object Movement Prediction Method Using Occupancy Grid Maps from Roadside Sensor 基于机器学习的路边传感器占用网格地图物体运动预测方法
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025XBL0005
Shota Matsushita;Onur Alparslan;Kenya Sato
{"title":"Machine Learning-Based Object Movement Prediction Method Using Occupancy Grid Maps from Roadside Sensor","authors":"Shota Matsushita;Onur Alparslan;Kenya Sato","doi":"10.23919/comex.2025XBL0005","DOIUrl":"https://doi.org/10.23919/comex.2025XBL0005","url":null,"abstract":"For automated vehicles, wide-ranging and real-time detection of the surrounding environment and accurate recognition of objects, including pedestrians, vehicles, and their movements, are crucial. In previous work, we proposed a method for estimating road environments as an occupancy grid map (OGM) using roadside sensors. However, OGMs independently calculate occupancy probabilities for each cell, which poses a challenge in accounting for the movement of objects across cells. This study proposed a machine learning-based method for predicting future OGMs, using OGMs from roadside LiDAR sensors. Real-world evaluations demonstrated that the proposed method predicts object movement with short execution times.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"189-192"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924592","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896461","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
Characterization of m × n Metasurface for Bandwidth Extension of Patch Antennas 贴片天线带宽扩展的m × n元表面表征
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2025SPL0016
Naoto Tomiyama;Hiroyuki Arai
{"title":"Characterization of m × n Metasurface for Bandwidth Extension of Patch Antennas","authors":"Naoto Tomiyama;Hiroyuki Arai","doi":"10.23919/comex.2025SPL0016","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0016","url":null,"abstract":"Patch antennas have been drawn rich attention in wireless system because of their low-profile structure, low cost and ease of manufacture. This paper discusses characterization of <tex>$mathrm{m} times mathrm{n}$</tex> meta surface for patch antenna in terms of bandwidth enhancement. To clarify the principle of operation of the periodic part, we focused on magnetic currents. As a result, it is found that at the design frequency of the periodic structure, both the patch and the periodic structure radiate. It was also found that the effect of elements not adjacent to the driving element was greater, radiating out-of-phase components.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"226-228"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924589","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196567","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
Segmentation-Driven Incremental Learning for Accurate Network Traffic Prediction 分段驱动的增量学习，用于准确的网络流量预测
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2024XBL0210
Erina Takeshita;Tomoya Kosugi
{"title":"Segmentation-Driven Incremental Learning for Accurate Network Traffic Prediction","authors":"Erina Takeshita;Tomoya Kosugi","doi":"10.23919/comex.2024XBL0210","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0210","url":null,"abstract":"This study proposes a novel data segmentation method for incremental learning in network traffic prediction, leveraging change points in network configuration data (e.g., the number of users and network equipment). Isolating high-variance segments improves the incremental learning performance. Existing methods such as the PELT algorithm in ruptures face challenges in isolating high-variance segments and have the disadvantage of high computational costs. In contrast, the proposed method efficiently identifies high-variance segments by leveraging network configuration data as segmentation criteria. This approach not only circumvents the computational costs associated with parameter tuning but also facilitates more effective isolation of high-variance segments, leading to improved segmentation accuracy. Experiments show an average MSE of 1.799, outperforming baseline methods (No Segmentation: 2.846, RPT: 2.653) and enhancing prediction accuracy.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"170-173"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924591","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896334","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
Quantitative Evaluation of Effect of Quality of Service Deterioration in Time Synchronization Message Transmission on Synchronization Accuracy Over Ethernet-Based in-Vehicle Network 基于以太网的车载网络时间同步消息传输服务质量恶化对同步精度影响的定量评价
IF 0.3
IEICE Communications Express Pub Date : 2025-03-12 DOI: 10.23919/comex.2024XBL0212
Maika Koizumi;Yoshihiro Ito
{"title":"Quantitative Evaluation of Effect of Quality of Service Deterioration in Time Synchronization Message Transmission on Synchronization Accuracy Over Ethernet-Based in-Vehicle Network","authors":"Maika Koizumi;Yoshihiro Ito","doi":"10.23919/comex.2024XBL0212","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0212","url":null,"abstract":"This paper evaluates the effect of the Quality of Service (QoS) degradation in time synchronization messages on the time synchronization accuracy over Ethernet-based in-vehicle networks with IEEE 802.1AS. In in-vehicle networks, congestion between the timeTransmitter and timeReceiver can reduce the time synchronization accuracy since the time synchronization is performed based on the link delay measurement in IEEE 802.1AS. However, the quantitative relationship between the time synchronization accuracy and QoS of the message transmission is unclear. This paper evaluates the QoS degradation and the synchronization accuracy under actual experimental networks. The results show that the Neighbor Rate Ratio and the standard deviation of Packet Delay Variation significantly influence the time synchronization accuracy.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 05","pages":"177-180"},"PeriodicalIF":0.3,"publicationDate":"2025-03-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10924595","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896429","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
Optical Filtering Tolerance of Single-Sideband Modified Duobinary Transmission with Maximum Likelihood Sequence Estimation 基于最大似然序列估计的单边带改进双二进制传输光滤波容限
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2024XBL0209
Tetsuya Nagaoka;Akihide Sano
{"title":"Optical Filtering Tolerance of Single-Sideband Modified Duobinary Transmission with Maximum Likelihood Sequence Estimation","authors":"Tetsuya Nagaoka;Akihide Sano","doi":"10.23919/comex.2024XBL0209","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0209","url":null,"abstract":"This paper proposes to use single-sideband modified duobinary (SSB-MDB) signaling in order to improve cascaded filtering tolerance in metro optical networks. The SSB-MDB signal is detected by using Kramers- Kronig (KK) reception scheme, and maximum likelihood sequence estimation (MLSE) is employed to improve the transmission performance. We show that the SSB-MDB has superior filtering tolerance compared with the 16-ary quadrature amplitude modulation (16QAM) with the same bit rate when the CW tone for KK reception is multiplexed at the receiver side.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 4","pages":"127-130"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904089","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143808855","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
Optimization Effects of Rotating Transmitarray for Direction-of-Arrival Estimation with a Single Antenna 旋转发射阵在单天线到达方向估计中的优化效果
IF 0.3
IEICE Communications Express Pub Date : 2025-02-25 DOI: 10.23919/comex.2025SPL0007
Ryusuke Sunagawa;Hibiki Shiiba;Makoto Sano;Ryuji Kuse;Takeshi Fukusako
{"title":"Optimization Effects of Rotating Transmitarray for Direction-of-Arrival Estimation with a Single Antenna","authors":"Ryusuke Sunagawa;Hibiki Shiiba;Makoto Sano;Ryuji Kuse;Takeshi Fukusako","doi":"10.23919/comex.2025SPL0007","DOIUrl":"https://doi.org/10.23919/comex.2025SPL0007","url":null,"abstract":"This paper discusses the optimization effects of a transmitarray on a direction-of-arrival (DOA) estimation using the transmitarray and a single receiving antenna. The transmitarray consists of 1-bit elements with 0° and 180° transmission phases. The transmission phase distribution was optimized using a genetic algorithm and compared to a random distribution. The optimized transmitarray achieves a DOA estimation accuracy comparable to that of a conventional system using a 3-element linear array antenna. The root mean square error (RMSE) of the optimized system exhibits a decreasing trend as the signal-to-noise ratio (SNR) increases. Notably, at an SNR of 20 dB, the RMSE is 20° lower than that of the 3-element linear array antenna.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 6","pages":"210-213"},"PeriodicalIF":0.3,"publicationDate":"2025-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10904078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144196626","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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