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Beam Steering of Lens Antenna with 4x4 Element 4-Port Antenna in the 300-GHz Band 300 ghz频段4 × 4单元4端口天线透镜天线的波束转向
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0167
Seiji Nishi;Kazuhiko Tamesue;Kunihisa Jitsuno;Toshio Sato;Takuro Sato;Tetsuya Kawanishi
{"title":"Beam Steering of Lens Antenna with 4x4 Element 4-Port Antenna in the 300-GHz Band","authors":"Seiji Nishi;Kazuhiko Tamesue;Kunihisa Jitsuno;Toshio Sato;Takuro Sato;Tetsuya Kawanishi","doi":"10.23919/comex.2024XBL0167","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0167","url":null,"abstract":"A circular polarized 4x4 element 4-port antenna in the 300 GHz band was designed and fabricated. Antenna gain of more than 10 dBic and axial ratio of less than 3 dB were obtained at 285.12 GHz to 289.44 GHz, which are ch 16 and ch 17 of IEEE 802.15.3d. If the power of the four ports were ideally combined, the antenna gain would increase by 6 dB to 16 dBic. A lens was designed for the circularly polarized 4x4 element 4-port antenna. The focal length of the lens was 100 mm and lens radius is 35 mm. An antenna gain of 40 dBic was calculated using the lens. Placing the 4x4 element 4-port antenna at the focal length of the lens would provide maximum gain, but no beam steering by phase controle. Placing the antenna closer than the focal length would lower the antenna gain but allow beam steering by phase controle. The antenna gain and beam tilt angle were calculated for different distances between the lens and the 4x4 element 4-port antenna. A lens antenna with a lens height of 70 mm was assembled and beam steering was measured.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"91-94"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800958","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
Distance Estimation Under Molecular Absorption Delay in THz Frequency Band 太赫兹波段分子吸收延迟下的距离估计
IF 0.3
IEICE Communications Express Pub Date : 2025-01-28 DOI: 10.23919/comex.2024XBL0174
Zhaona Wu;Kenta Umebayashi;Janne Lehtomaki
{"title":"Distance Estimation Under Molecular Absorption Delay in THz Frequency Band","authors":"Zhaona Wu;Kenta Umebayashi;Janne Lehtomaki","doi":"10.23919/comex.2024XBL0174","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0174","url":null,"abstract":"In this letter, we propose a distance estimation method that accounts for molecular absorption (MA) delay in the THz frequency band. In radio propagation, the time of arrival (TOA) at the receiver from the transmitter is typically determined by the propagation delay, which is the distance divided by the speed of light in a line-of-sight (LoS) scenario. However, in THz the observable TOA could exceed the propagation delay due to an additional delay denoted by MA delay caused by molecular absorption. This MA delay introduces a biased estimate into conventional distance estimations. In this letter, a novel distance estimation method based on TOA incorporating MA delay is proposed. Numerical evaluations indicate that our proposed distance estimation method outperforms the conventional approach by accounting for the effects of MA delay.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 3","pages":"99-102"},"PeriodicalIF":0.3,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10856835","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143800760","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
Indoor mMTC Group Targets Localization in 5G Networks Based on Parallel Chaotic Stochastic Resonance Processing of Distance Estimation Between Terminals 基于终端距离估计并行混沌随机共振处理的5G网络室内mMTC群目标定位
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0142
Zhijun Qin;Tengfei Xie;Chen Xie;Di He
{"title":"Indoor mMTC Group Targets Localization in 5G Networks Based on Parallel Chaotic Stochastic Resonance Processing of Distance Estimation Between Terminals","authors":"Zhijun Qin;Tengfei Xie;Chen Xie;Di He","doi":"10.23919/comex.2024XBL0142","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0142","url":null,"abstract":"In this research, a high-precision positioning method for 5G group communication terminals based on the mMTC scenario is proposed. Group positioning extends the original positioning for a single terminal to positioning for multiple terminals simultaneously, utilizing the interaction information between terminals to optimize the positioning results by using the parallel chaotic stochastic resonance processing technique. On the basis of traditional single target positioning algorithms, the mMTC communication mode is effectively used to increase the positioning information between terminals and improve the average positioning accuracy of each communication terminal in the 5G cluster.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"59-62"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799929","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107197","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
Explosives Detection using Shadow Features in Radar Images for Walk-Through Security Screening 利用雷达图像中的阴影特征进行爆炸物检测
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0172
Shingo Yamanouchi;Masayuki Ariyoshi;Toshiyuki Nomura
{"title":"Explosives Detection using Shadow Features in Radar Images for Walk-Through Security Screening","authors":"Shingo Yamanouchi;Masayuki Ariyoshi;Toshiyuki Nomura","doi":"10.23919/comex.2024XBL0172","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0172","url":null,"abstract":"Radar imaging technologies have been utilized to detect concealed hazardous materials for security screening in public facilities. We have developed a high-throughput walk-through and whole-body security screening system called Invisible Sensing (IVS) based on radar imaging and deep learning. In our previous work, we have demonstrated that the IVS system can detect guns and knives while subject persons walk through the system. This paper presents a newly developed function to detect explosives in radar images on the IVS system. Since most explosives have low reflectivity to microwaves, it is difficult to detect the shape of explosives in radar images. In contrast, the human body is highly reflective and visible in radar images. We propose a novel approach to detect low-reflective explosives in radar images by learning shadow features against the high-reflective human body background. We demonstrate that the proposed detection technique integrated into the IVS system achieved successful explosive detection performance in real time.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"71-74"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799932","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107200","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
Three-Axis Coil Array for Null-Free Near-Field Tag Reading with UHF RFID 三轴线圈阵列用于超高频RFID无零近场标签读取
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0178
Akihito Noda
{"title":"Three-Axis Coil Array for Null-Free Near-Field Tag Reading with UHF RFID","authors":"Akihito Noda","doi":"10.23919/comex.2024XBL0178","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0178","url":null,"abstract":"Tiny radio-frequency identification (RFID) tags with a 1 mm square scale can be attached to small insects such as ants and used to detect their passage at RFID reader antennas in a laboratory arena. Although the movement paths of ants can be restricted inside a narrow tube, the ants pass through the tube in various postures. A single small coil antenna attached to the tube generates nulls, where the tags become unreadable due to specific tag orientations. This letter proposes a tag reading system with three antennas generating major magnetic field vectors in three orthogonal directions, to eliminate nulls within the tube, regardless of the tag orientation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"55-58"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799933","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107196","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
Discrete Wigner-Ville Distribution with Wide Frequency Observation Range 宽频率观测范围的离散Wigner-Ville分布
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0168
Tomoya Yamaoka;Tadashi Oshima
{"title":"Discrete Wigner-Ville Distribution with Wide Frequency Observation Range","authors":"Tomoya Yamaoka;Tadashi Oshima","doi":"10.23919/comex.2024XBL0168","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0168","url":null,"abstract":"The Wigner-Ville distribution (WVD) is a high-resolution time-frequency analysis method. However, the discrete WVD (DWVD) has the problem of a narrow frequency observation range. This is because the time sampling of the symmetric instantaneous auto-correlation function (SIAF) changes simultaneously in the positive and negative directions. As a result, the sampling period of the SIAF in the case of DWVD is doubled and the frequency observation range is halved. Therefore, we propose a DWVD that does not narrow the frequency observation range. Specifically, when deriving the SIAF, in addition to the conventional sample that varies in both the positive and negative directions, we consider a sample averaged over two samples that vary only in the positive or negative direction. The proposed process allows the DWVD to be performed without halving the frequency observation range. However, this process causes a small aliasing component, which can be reduced by the use of window functions. This study will demonstrate this effect by using the proposed method for chirp waveforms.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"67-70"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799926","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107199","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
Visible Light Communication Technology in Digital Operating Room: Experiment and Equipment Manufacturing 数字化手术室可见光通信技术：实验与设备制造
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0181
Xiaofei Wang;Chao Zhang;Jian Song
{"title":"Visible Light Communication Technology in Digital Operating Room: Experiment and Equipment Manufacturing","authors":"Xiaofei Wang;Chao Zhang;Jian Song","doi":"10.23919/comex.2024XBL0181","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0181","url":null,"abstract":"With the technology advances and implementation acceleration of medical digitization, more and more medical devices with radio frequency (RF) wireless communication capabilities are adopted in the hospitals for the conveniences and easily for the deployments. That causes the concerns on electromagnetic interference problem affecting medical safety seriously and should be considered carefully in reality. As an attractive technology, visible light communication (VLC) uses visible light offering illumination and communication at the same time. Compared with the traditional RF communication systems, VLC has significant advantages such as energy saving, easy deployment, no radio interference, electromagnetic compatibility and etc.. In this paper, the experiment utilizing VLC in the digital operating room to reduce electromagnetic interference is presented with implementation details on the test environment and both uplink and downlink hardware design and key parameters to support video/image transmission. The effectiveness of VLC system is verified to deploy in a real digital operating room and support in operation.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"63-66"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799928","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107202","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
Occupancy Grid Map Estimation Method using Roadside Sensor for Cooperative Automated Driving 基于路边传感器的协同自动驾驶占用网格图估计方法
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0176
Shota Matsushita;Onur Alparslan;Kenya Sato
{"title":"Occupancy Grid Map Estimation Method using Roadside Sensor for Cooperative Automated Driving","authors":"Shota Matsushita;Onur Alparslan;Kenya Sato","doi":"10.23919/comex.2024XBL0176","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0176","url":null,"abstract":"In recent years, cooperative automated driving, which shares information from in-vehicle and roadside sensors via communication technology, has gained attention. To share sensor information, methods using occupancy grid maps (OGMs) have been explored. However, when using roadside sensors to estimate OGMs, which are installed at higher elevations than in-vehicle sensors, the challenge arises of being unable to accurately recognize the road environment due to increased undetected areas. This study proposed a method to estimate OGMs using roadside LiDAR sensors, considering undetected areas. And the proposed method was demonstrated to accurately reflect the road environment in OGMs.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"83-86"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799924","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107195","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
A Complexity-Reduction Sub-Terahertz Image Sensing Method using Adaptive Signal Processing 一种基于自适应信号处理的复杂性降低亚太赫兹图像传感方法
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0187
Taisei Kurahashi;Eiji Okamoto
{"title":"A Complexity-Reduction Sub-Terahertz Image Sensing Method using Adaptive Signal Processing","authors":"Taisei Kurahashi;Eiji Okamoto","doi":"10.23919/comex.2024XBL0187","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0187","url":null,"abstract":"Terahertz-wave sensing is expected to be used for high-resolution metal detection because of its broadband nature and object transparency. However, when terahertz-band near-field image sensing is conducted using array antennas, the amount of signal processing increases significantly with the resolution. We propose a low-complexity imaging algorithm that changes the sensing resolution adaptively according to the area where an object may exist without compromising the object detection capability. Experimental results using actual measured data show that the proposed method reduces the computational complexity to less than one-third of that of conventional linear interpolation methods without degrading the quality of the sensed image.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"79-82"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799927","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107201","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
Beam Steering Realization using a Reflective Metasurface for THz Applications 太赫兹应用中使用反射元表面的波束导向实现
IF 0.3
IEICE Communications Express Pub Date : 2024-12-13 DOI: 10.23919/comex.2024XBL0182
Liang-Yu Ou Yang;Siang-Cyun Liao;Bingzhang Tsai
{"title":"Beam Steering Realization using a Reflective Metasurface for THz Applications","authors":"Liang-Yu Ou Yang;Siang-Cyun Liao;Bingzhang Tsai","doi":"10.23919/comex.2024XBL0182","DOIUrl":"https://doi.org/10.23919/comex.2024XBL0182","url":null,"abstract":"This paper presents a reflective metasurface designed for beam steering at 300 GHz. The metasurface uses an H-shaped structure as its unit cell to achieve desired reflection phases. A supercell, consisting of 16 unit cells, covers a complete reflection phase range of 360 degrees. To achieve a radiation pattern with the main beam directed at 30 degrees from the broadside direction, 28 supercells are fabricated on a grounded GaAs substrate of dimensions 4.4 mm × 4.4 mm. Full-wave simulations are conducted, demonstrating that the proposed metasurface achieves an overall gain of 10 dBi under a horn excitation. In addition, the radiation and transmission performance of the proposed metasurface over a long distance in a complex environment with multipath effects is proven to be effective. These results suggest that such metasurfaces have significant potential in THz applications.","PeriodicalId":54101,"journal":{"name":"IEICE Communications Express","volume":"14 2","pages":"75-78"},"PeriodicalIF":0.3,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=10799925","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143107203","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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