Pub Date : 2020-08-26DOI: 10.1109/iwem49354.2020.9237398
Chengxi Yu, Shih-Hau Fang, Larry Lin, Ying-Ren Chien, Zhezhuang Xu
Recently, the millimeter wave (mmWave) radar sensing has attracted significant attention due to the physical characteristic of mmWave signals and the large 5G frequency bands. Transforming the mmWave signals into point clouds via physics enables many new applications such as human activity recognition. However, learning the human activity from the mmWave point-clouds are susceptible to many environmental/dynamic factors, such as the spatial diversity, facing orientation, and the physical stature of users, which can severely degrade the performance of radar-based human activity recognition systems. By developing a dataset based on the TI hardware platform, this paper builds a baseline recognition system using convolutional neural networks [1], investigates the properties of mmWave point-clouds, and reports the recognition accuracy for six human activities under different experimental scenarios including the distinct testing locations, different orientations and physical stature of users.
{"title":"The Impact of Environmental Factors on mm-Wave Radar Point-Clouds for Human Activity Recognition","authors":"Chengxi Yu, Shih-Hau Fang, Larry Lin, Ying-Ren Chien, Zhezhuang Xu","doi":"10.1109/iwem49354.2020.9237398","DOIUrl":"https://doi.org/10.1109/iwem49354.2020.9237398","url":null,"abstract":"Recently, the millimeter wave (mmWave) radar sensing has attracted significant attention due to the physical characteristic of mmWave signals and the large 5G frequency bands. Transforming the mmWave signals into point clouds via physics enables many new applications such as human activity recognition. However, learning the human activity from the mmWave point-clouds are susceptible to many environmental/dynamic factors, such as the spatial diversity, facing orientation, and the physical stature of users, which can severely degrade the performance of radar-based human activity recognition systems. By developing a dataset based on the TI hardware platform, this paper builds a baseline recognition system using convolutional neural networks [1], investigates the properties of mmWave point-clouds, and reports the recognition accuracy for six human activities under different experimental scenarios including the distinct testing locations, different orientations and physical stature of users.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"197 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131435839","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237391
Shen Shou Max Chung, S. Tuan
The new factor in future air combat is the emergence of armed unmanned aerial vehicle (UAV) swarm. In this article we analyze the radar cross section (RCS) of a XQ-58 Valkyrie like CAD model without its engine and air intake with Multi-Level-Fast-Multipole-Method (MLFMM) algorithm in S-band. We found the boresight RCS at 2 GHz is about −5.39 dBsm, not as small as expected from a true RF stealth fighter, but with adequate radar absorption material (RAM) painted, it can reach the RCS realm of a RF stealth fighter.
{"title":"Radar Cross Section Simulation of XQ-58 Valkyrie Like CAD Model","authors":"Shen Shou Max Chung, S. Tuan","doi":"10.1109/iWEM49354.2020.9237391","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237391","url":null,"abstract":"The new factor in future air combat is the emergence of armed unmanned aerial vehicle (UAV) swarm. In this article we analyze the radar cross section (RCS) of a XQ-58 Valkyrie like CAD model without its engine and air intake with Multi-Level-Fast-Multipole-Method (MLFMM) algorithm in S-band. We found the boresight RCS at 2 GHz is about −5.39 dBsm, not as small as expected from a true RF stealth fighter, but with adequate radar absorption material (RAM) painted, it can reach the RCS realm of a RF stealth fighter.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130329210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237407
Kuo-Shin Huang, Kai-Wei Chang, Ko-Fan Tsai, T. Liu, Ching-Huang Lin
The measurements of be am size, divergence angle and beam quality depend on accurate assessment of intensity distribution. In this paper, we utilize image projection method to get intensity distribution of lasers. Lasers with different divergence angles (VCSEL, 24degrees/He-Ne laser, 0.057degrees) are used to be two different cases with respect to large and small divergence angles. The spots are projected on different rotating diffuser films. In the case of VCSEL, we found that the film selection is critical in acquiring correct values when ISO 11146-1:2005 is adopted.
{"title":"Far Field Intensity Measurement for Lasers","authors":"Kuo-Shin Huang, Kai-Wei Chang, Ko-Fan Tsai, T. Liu, Ching-Huang Lin","doi":"10.1109/iWEM49354.2020.9237407","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237407","url":null,"abstract":"The measurements of be am size, divergence angle and beam quality depend on accurate assessment of intensity distribution. In this paper, we utilize image projection method to get intensity distribution of lasers. Lasers with different divergence angles (VCSEL, 24degrees/He-Ne laser, 0.057degrees) are used to be two different cases with respect to large and small divergence angles. The spots are projected on different rotating diffuser films. In the case of VCSEL, we found that the film selection is critical in acquiring correct values when ISO 11146-1:2005 is adopted.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121146821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237402
Cheng-Nan Hu, Wei-Jie Xu, Ruei-Ze Gao, Zong-Ting Cai, Xin-Zhi Chen, Chia-Chuan Wu, P. Lo
This study numerically and experimentally investigate the use of monopulse tracking algorithm for angle estimation in Channel Sounder system by using a 2×4 millimeterwave (mmWave) antenna module operating at 28 GHz.
{"title":"Monopulse Tracking Method for Angle Estimation in 5G Millimeter-Wave Channel Sounder","authors":"Cheng-Nan Hu, Wei-Jie Xu, Ruei-Ze Gao, Zong-Ting Cai, Xin-Zhi Chen, Chia-Chuan Wu, P. Lo","doi":"10.1109/iWEM49354.2020.9237402","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237402","url":null,"abstract":"This study numerically and experimentally investigate the use of monopulse tracking algorithm for angle estimation in Channel Sounder system by using a 2×4 millimeterwave (mmWave) antenna module operating at 28 GHz.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132686296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237424
Wen-Jiao Liao, Chun-Wei Yang
A compact dualband WLAN two-antenna system is proposed for implementation on the corner of a mobile platform. To ensure proper isolation performance, a decoupling network made of lumped elements and configured in a π-shaped scheme is inserted between two orthogonally displaced antennas. Simulation results suggest such a design can achieve dualband MIMO operation with satisfying isolation performance. It can be employed on mobile platforms such as notebooks and handsets.
{"title":"Compact Dualband WLAN Two-Antenna Design for Mobile Platforms","authors":"Wen-Jiao Liao, Chun-Wei Yang","doi":"10.1109/iWEM49354.2020.9237424","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237424","url":null,"abstract":"A compact dualband WLAN two-antenna system is proposed for implementation on the corner of a mobile platform. To ensure proper isolation performance, a decoupling network made of lumped elements and configured in a π-shaped scheme is inserted between two orthogonally displaced antennas. Simulation results suggest such a design can achieve dualband MIMO operation with satisfying isolation performance. It can be employed on mobile platforms such as notebooks and handsets.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134134193","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iwem49354.2020.9237453
{"title":"Title Page","authors":"","doi":"10.1109/iwem49354.2020.9237453","DOIUrl":"https://doi.org/10.1109/iwem49354.2020.9237453","url":null,"abstract":"","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"603 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133497716","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper proposes a design of MIMO antennas with a pairs of two arm monopole antennas and an isolation element for applications of laptop computers. The overall size of system ground plane is 200mm×260mm×0.8mm and the size of the MIMO antennas with an isolation element is 5mm×40mm×2.8mm. There are two monopole antennas with two arms and grounded metal loop with two chopped corners in the design. The monopole with two arms could produce the modes to cover the bands 3.4-4.2 GHz, 4.4-5GHz, 5.15-5.35GHz, 5.725-5.825GHz, and the grounded metal loop with two chopped corners can effectively reduce the mutual coupling effect between two antennas. The simulated radiation efficiencies are larger than 75%, and the simulated antenna gains are about 2dBi. The MIMO antennas design has the advantage of small-size, broadband and good radiation properties; therefore it is suitable for applications of laptop computer.
{"title":"Small-size and Broadband Sub-6G MIMO Antennas for Laptop Computers","authors":"Yue Li, Wen‐Shan Chen, Yung-Tao Liu, Hong‐Twu Chen","doi":"10.1109/iWEM49354.2020.9237439","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237439","url":null,"abstract":"This paper proposes a design of MIMO antennas with a pairs of two arm monopole antennas and an isolation element for applications of laptop computers. The overall size of system ground plane is 200mm×260mm×0.8mm and the size of the MIMO antennas with an isolation element is 5mm×40mm×2.8mm. There are two monopole antennas with two arms and grounded metal loop with two chopped corners in the design. The monopole with two arms could produce the modes to cover the bands 3.4-4.2 GHz, 4.4-5GHz, 5.15-5.35GHz, 5.725-5.825GHz, and the grounded metal loop with two chopped corners can effectively reduce the mutual coupling effect between two antennas. The simulated radiation efficiencies are larger than 75%, and the simulated antenna gains are about 2dBi. The MIMO antennas design has the advantage of small-size, broadband and good radiation properties; therefore it is suitable for applications of laptop computer.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"11 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132571649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237418
Ching-Yu Huang, Jui-Ching Cheng
This paper proposes a leaky-wave antenna implemented on mobile phone side rims for 5G millimeter-wave bands. The proposed leaky-wave antenna is formed by a microstrip line periodically loaded with series metal-insulator-metal capacitors. To cover both the 24.25-29.5 GHz and 37–40 GHz frequency bands, two of the proposed leaky wave antennas are combined by a diplexer. Measured results show that a 10-dB return loss bandwidth from 23.8 GHz to 27.1 GHz and 37.2 GHz to 40 GHz is achieved. The measured realized gains are all greater than 6.5 dBi in the frequency range.
{"title":"Millimeter-Wave Leaky-Wave Antenna for 5G Mobile Phone","authors":"Ching-Yu Huang, Jui-Ching Cheng","doi":"10.1109/iWEM49354.2020.9237418","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237418","url":null,"abstract":"This paper proposes a leaky-wave antenna implemented on mobile phone side rims for 5G millimeter-wave bands. The proposed leaky-wave antenna is formed by a microstrip line periodically loaded with series metal-insulator-metal capacitors. To cover both the 24.25-29.5 GHz and 37–40 GHz frequency bands, two of the proposed leaky wave antennas are combined by a diplexer. Measured results show that a 10-dB return loss bandwidth from 23.8 GHz to 27.1 GHz and 37.2 GHz to 40 GHz is achieved. The measured realized gains are all greater than 6.5 dBi in the frequency range.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114949343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-08-26DOI: 10.1109/iWEM49354.2020.9237414
Cheng-tao Li, Che-Yu Liu, S. Wu, Sheng-Wei Guan, Ming-Shan Lin, Chia-Hung Su
In this paper, time domain near field measurement for system level ESD (electrostatic discharge) is to solve temporary failures in ESD testing. First, this paper measure the waveform of ESD by oscilloscope then use simulation tools to create the model of ESD gun and nearfield simulation result. Finally, we use time domain near field measurement system to measure the sample and compare with simulation result.
{"title":"Time domain Near-Field Measurement Technology and Simulation for System Level ESD Testing","authors":"Cheng-tao Li, Che-Yu Liu, S. Wu, Sheng-Wei Guan, Ming-Shan Lin, Chia-Hung Su","doi":"10.1109/iWEM49354.2020.9237414","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237414","url":null,"abstract":"In this paper, time domain near field measurement for system level ESD (electrostatic discharge) is to solve temporary failures in ESD testing. First, this paper measure the waveform of ESD by oscilloscope then use simulation tools to create the model of ESD gun and nearfield simulation result. Finally, we use time domain near field measurement system to measure the sample and compare with simulation result.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114474226","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper presents a quick method by using design chart to make a compact crossover design for planar circuit. The crossover is derived from the conventional three-section branch line structure. The proposed crossover planar circuit feature is implemented with moderate line impedance, compact layout and good performance. For verification, a single band crossover circuit works at 2.45GHz is fabricated and tested. Both simulated and measured results are found to be well matching with each other.
{"title":"A Quick Crossover Design of a Three-Section Branch Line Structure","authors":"Nadiah Alhusna Pramudya, Yu-hsiang Chou, Jan-Dong Tseng","doi":"10.1109/iWEM49354.2020.9237409","DOIUrl":"https://doi.org/10.1109/iWEM49354.2020.9237409","url":null,"abstract":"This paper presents a quick method by using design chart to make a compact crossover design for planar circuit. The crossover is derived from the conventional three-section branch line structure. The proposed crossover planar circuit feature is implemented with moderate line impedance, compact layout and good performance. For verification, a single band crossover circuit works at 2.45GHz is fabricated and tested. Both simulated and measured results are found to be well matching with each other.","PeriodicalId":201518,"journal":{"name":"2020 International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128082202","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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