Pub Date : 2022-08-29DOI: 10.1109/iWEM52897.2022.9992300
Kazuki Yoshida, T. Hikage, Manebu Omiya
This study focuses on the human body shadowing the propagation characteristics of local-5G frequency bands in indoor environments. We modeled an indoor propagation environment assuming a conference room containing human bodies and evaluated the propagation characteristics through a large-scale 3D numerical analysis based on the FDTD method. The electric field distribution in the conference room environment excited by the 4.7GHz transmitting antenna, which is used as the local-5G frequency, was calculated, and the propagation characteristics with and without the human bodies were compared. Shadowing and scattering effects due to multiple human bodies in standing and sitting postures were evaluated in the simulations.
{"title":"Estimation of Human Body Shadowing for Indoor Propagation in the 5G Frequency Band Using Parallel FDTD Analysis","authors":"Kazuki Yoshida, T. Hikage, Manebu Omiya","doi":"10.1109/iWEM52897.2022.9992300","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9992300","url":null,"abstract":"This study focuses on the human body shadowing the propagation characteristics of local-5G frequency bands in indoor environments. We modeled an indoor propagation environment assuming a conference room containing human bodies and evaluated the propagation characteristics through a large-scale 3D numerical analysis based on the FDTD method. The electric field distribution in the conference room environment excited by the 4.7GHz transmitting antenna, which is used as the local-5G frequency, was calculated, and the propagation characteristics with and without the human bodies were compared. Shadowing and scattering effects due to multiple human bodies in standing and sitting postures were evaluated in the simulations.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134132234","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993486
H. Wei, Xiaofei Xu, Kaya Pi
The characteristics of coupled metamaterial microstrip lines (meta-MSLs) are numerically studied in this work. A particular feature for the new coupled meta-MSLs is that they can work with a very short distance between the traces, making them proposing to be utilized in a high-density layout package where the compact sizes are of much concern.
{"title":"Numerical Study of the Coupled Metamaterial Microstrip Lines","authors":"H. Wei, Xiaofei Xu, Kaya Pi","doi":"10.1109/iWEM52897.2022.9993486","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993486","url":null,"abstract":"The characteristics of coupled metamaterial microstrip lines (meta-MSLs) are numerically studied in this work. A particular feature for the new coupled meta-MSLs is that they can work with a very short distance between the traces, making them proposing to be utilized in a high-density layout package where the compact sizes are of much concern.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130964384","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993536
Ibuki Asahina, S. Saito, Y. Kimura
This paper presents a frequency-tunable varactor-loaded single-layer triple-band miniaturized microstrip antenna (MSA) fed by an L-probe with straight shorted elements. The proposed antenna consists of three shorted patches with different sizes and a feeding L-probe arranged on a single-layer dielectric substrate. In order to change resonant frequencies of the three patches, a varactor diode is mounted on each patch near the shorted via hole and a bias circuit to apply a DC voltage to the varactor diode for each patch is placed on the back side of the ground plane. Therefore, three resonant frequencies of the patches are controlled independently by the bias voltages in different frequency bands. In this paper, measured performance of the proposed miniaturized varactor-loaded frequency-tunable triple-band MSA is presented. Measured resonant frequency ranges of the three bands are 2.608 to 3.416 GHz, 3.509 to 4.783 GHz, and 5.038 to 6.008 GHz, respectively, when the DC voltages applied to the varactor diodes are changed from 0 to 8 V.
{"title":"Resonant Frequency Control of a Varactor-Loaded Single-Layer Triple-Band Miniaturized Microstrip Antenna Fed by an L-probe with Straight Shorted Elements","authors":"Ibuki Asahina, S. Saito, Y. Kimura","doi":"10.1109/iWEM52897.2022.9993536","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993536","url":null,"abstract":"This paper presents a frequency-tunable varactor-loaded single-layer triple-band miniaturized microstrip antenna (MSA) fed by an L-probe with straight shorted elements. The proposed antenna consists of three shorted patches with different sizes and a feeding L-probe arranged on a single-layer dielectric substrate. In order to change resonant frequencies of the three patches, a varactor diode is mounted on each patch near the shorted via hole and a bias circuit to apply a DC voltage to the varactor diode for each patch is placed on the back side of the ground plane. Therefore, three resonant frequencies of the patches are controlled independently by the bias voltages in different frequency bands. In this paper, measured performance of the proposed miniaturized varactor-loaded frequency-tunable triple-band MSA is presented. Measured resonant frequency ranges of the three bands are 2.608 to 3.416 GHz, 3.509 to 4.783 GHz, and 5.038 to 6.008 GHz, respectively, when the DC voltages applied to the varactor diodes are changed from 0 to 8 V.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130414639","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993518
Kaito Otsubo, K. Honda
In this paper, we investigate the interferometric angle-of-arrival (AOA) estimation accuracy using an AOA antenna with a ground plane in a Rice propagation environment utilizing a three-dimensional fading emulator. The results reveal that the proposed antenna can provide an AOA estimate with high accuracy regardless of the propagation environment of the incoming wave.
{"title":"Estimation Accuracy of an AOA Antenna in Rice Propagation Environment Using OTA Apparatus","authors":"Kaito Otsubo, K. Honda","doi":"10.1109/iWEM52897.2022.9993518","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993518","url":null,"abstract":"In this paper, we investigate the interferometric angle-of-arrival (AOA) estimation accuracy using an AOA antenna with a ground plane in a Rice propagation environment utilizing a three-dimensional fading emulator. The results reveal that the proposed antenna can provide an AOA estimate with high accuracy regardless of the propagation environment of the incoming wave.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115740623","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993547
Xiao-Long Huang, Guanghui Xu, Tyler Blundo, Z. Shao, K. Sengupta
This paper introduces a design method of transmitarray antennas (TAAs) with a small patch array feed. The transmitarray element consisting of two meshed triple-circle rings is studied and analyzed to realize a large transmission phase range of 285° by tuning only the radius of the inner ring. To validate the design method, a TAA of size less than 5×5 λ02 is designed at 38.5 GHz. Simulated results show that the proposed TAA exhibits a high gain of 20.85 dBi at 38.5 GHz while maintaining a gain ripple of less than ± 0.5 dB from 37 to 40 GHz, indicating it is a good antenna candidate for mm-wave applications.
{"title":"A mmWave Transmitarray with Patch Array Feed","authors":"Xiao-Long Huang, Guanghui Xu, Tyler Blundo, Z. Shao, K. Sengupta","doi":"10.1109/iWEM52897.2022.9993547","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993547","url":null,"abstract":"This paper introduces a design method of transmitarray antennas (TAAs) with a small patch array feed. The transmitarray element consisting of two meshed triple-circle rings is studied and analyzed to realize a large transmission phase range of 285° by tuning only the radius of the inner ring. To validate the design method, a TAA of size less than 5×5 λ02 is designed at 38.5 GHz. Simulated results show that the proposed TAA exhibits a high gain of 20.85 dBi at 38.5 GHz while maintaining a gain ripple of less than ± 0.5 dB from 37 to 40 GHz, indicating it is a good antenna candidate for mm-wave applications.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121108704","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993552
Shinnosuke Sakaya, Masaharu Takahashi
In this study, we investigate an undersea position estimation algorithm using electromagnetic waves as an assistive technology for divers during sea rescue. We have proposed an algorithm to estimate the position of a transmitting antenna in the sea by using surfaces generated by machine-learning. In this paper, we compare our proposed algorithm with the undersea position estimation algorithms conducted in our previous study.
{"title":"Evaluation of undersea position estimation using curved surfaces generated by machine learning","authors":"Shinnosuke Sakaya, Masaharu Takahashi","doi":"10.1109/iWEM52897.2022.9993552","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993552","url":null,"abstract":"In this study, we investigate an undersea position estimation algorithm using electromagnetic waves as an assistive technology for divers during sea rescue. We have proposed an algorithm to estimate the position of a transmitting antenna in the sea by using surfaces generated by machine-learning. In this paper, we compare our proposed algorithm with the undersea position estimation algorithms conducted in our previous study.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122776966","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993467
T. Mizutani, N. Michishita, Hiroshi Sato, Y. Koyanagi, H. Morishita
This paper proposes a low-profile orthogonally polarized antenna. The proposed antenna is composed of a sleeve antenna as a vertically polarized element and a Halo antenna with parasitic elements as a horizontally polarized element. Two short elements are loaded symmetrically with the gap of the Halo antenna to achieve an orthogonal polarization antenna that is omnidirectional in both polarizations. The validity of the simulation results was confirmed by fabricating the proposed antenna.
{"title":"Orthogonal Polarization Omnidirectional Antenna Using a Halo Antenna Loaded with Short Elements","authors":"T. Mizutani, N. Michishita, Hiroshi Sato, Y. Koyanagi, H. Morishita","doi":"10.1109/iWEM52897.2022.9993467","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993467","url":null,"abstract":"This paper proposes a low-profile orthogonally polarized antenna. The proposed antenna is composed of a sleeve antenna as a vertically polarized element and a Halo antenna with parasitic elements as a horizontally polarized element. Two short elements are loaded symmetrically with the gap of the Halo antenna to achieve an orthogonal polarization antenna that is omnidirectional in both polarizations. The validity of the simulation results was confirmed by fabricating the proposed antenna.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121430119","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993527
Taiyo Kai, N. Michishita, H. Morishita
In this study, a novel helmet antenna is proposed using a disk-loaded monopole antenna. The proposed antenna operates at the very high frequency (VHF) band with omnidirectional and vertically polarized radiation pattern in the horizontal plane. In addition, an annular slit is created on the outer shell of the proposed antenna in order to reduce radio waves radiated toward the human head. The effect of slit is studied by simulating the proposed antenna with the human head. Simulation results show that the VSWR characteristic of the proposed antenna is largely maintained even when close to the human head and the radio waves radiated toward the human head are extremely weak.
{"title":"A Helmet Antenna Using Disk-Loaded Monopole Antenna for Disaster Prevention","authors":"Taiyo Kai, N. Michishita, H. Morishita","doi":"10.1109/iWEM52897.2022.9993527","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993527","url":null,"abstract":"In this study, a novel helmet antenna is proposed using a disk-loaded monopole antenna. The proposed antenna operates at the very high frequency (VHF) band with omnidirectional and vertically polarized radiation pattern in the horizontal plane. In addition, an annular slit is created on the outer shell of the proposed antenna in order to reduce radio waves radiated toward the human head. The effect of slit is studied by simulating the proposed antenna with the human head. Simulation results show that the VSWR characteristic of the proposed antenna is largely maintained even when close to the human head and the radio waves radiated toward the human head are extremely weak.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126398316","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993539
Kohei Yamamoto, T. Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai
In order to investigate thermal thresholds of biological effects of humans exposed to millimeter waves (MMW), A novel 60 GHz band exposure set-up has been newly developed. To achieve high duty exposure to the desired spot area on human skin at 60 GHz, the authors proposed a spatial synthetic exposure set-up consists of dielectric lens antennas. We applied orthogonalizing polarized feeding structure to eliminate interference fringes due to the combined two-directional beam radiations. Then, the developed set-up enabled efficient and desired exposure control for the experiment to explore the biological effects of local exposure to MMWs on human volunteers.
{"title":"A Novel 60 GHz Spatial Synthetic Exposure Set-up for the Study of Thermal Perception Thresholds for Biological Effects of 5G and Beyond Wireless Systems","authors":"Kohei Yamamoto, T. Hikage, Hiroshi Masuda, Tatsuya Ishitake, Kun Li, Akiko Nagai","doi":"10.1109/iWEM52897.2022.9993539","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993539","url":null,"abstract":"In order to investigate thermal thresholds of biological effects of humans exposed to millimeter waves (MMW), A novel 60 GHz band exposure set-up has been newly developed. To achieve high duty exposure to the desired spot area on human skin at 60 GHz, the authors proposed a spatial synthetic exposure set-up consists of dielectric lens antennas. We applied orthogonalizing polarized feeding structure to eliminate interference fringes due to the combined two-directional beam radiations. Then, the developed set-up enabled efficient and desired exposure control for the experiment to explore the biological effects of local exposure to MMWs on human volunteers.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"308 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127567674","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 : 2022-08-29DOI: 10.1109/iWEM52897.2022.9993575
Keito Yokoe, Kota Hakamata, S. Makino, K. Itoh
A MACKEY (Metamaterial Antenna Chip developed by KIT EOE LaboratorY) that is sufficiently robust to metal object proposed. By combining two such MACKEYs, we develop an antenna that radiates circularly polarized waves with a good axial ratio.
{"title":"Circularly Polarized MACKEY with Improved Axial Ratio","authors":"Keito Yokoe, Kota Hakamata, S. Makino, K. Itoh","doi":"10.1109/iWEM52897.2022.9993575","DOIUrl":"https://doi.org/10.1109/iWEM52897.2022.9993575","url":null,"abstract":"A MACKEY (Metamaterial Antenna Chip developed by KIT EOE LaboratorY) that is sufficiently robust to metal object proposed. By combining two such MACKEYs, we develop an antenna that radiates circularly polarized waves with a good axial ratio.","PeriodicalId":433151,"journal":{"name":"2022 IEEE International Workshop on Electromagnetics: Applications and Student Innovation Competition (iWEM)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121742237","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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