Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814398
Duschia M. Bodet, J. Jornet
Terahertz (THz) communications are envisioned as the future of wireless communications. In order to combat the high path loss experienced by THz signals, beamforming using multiple-input multiple-output (MIMO) systems has been suggested. In this paper, two practical challenges for THz line-of-sight MIMO systems are investigated for the first time: the impact of antenna element directivity and self-induced inter-symbol interference on performance. Additionally, experimental results are presented to verify the findings.
{"title":"Impact of Antenna Element Directivity and Reflection-Interference on Line-of-Sight Multiple Input Multiple Output Terahertz Systems","authors":"Duschia M. Bodet, J. Jornet","doi":"10.23919/AT-AP-RASC54737.2022.9814398","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814398","url":null,"abstract":"Terahertz (THz) communications are envisioned as the future of wireless communications. In order to combat the high path loss experienced by THz signals, beamforming using multiple-input multiple-output (MIMO) systems has been suggested. In this paper, two practical challenges for THz line-of-sight MIMO systems are investigated for the first time: the impact of antenna element directivity and self-induced inter-symbol interference on performance. Additionally, experimental results are presented to verify the findings.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"130 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124249817","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814228
Y. N. Wijayanto, K. Paramayudha, A. Kanno
We design slotted waveguide antennas and observe their characteristics for application in THz bands. The antenna consists of a rectangular waveguide, radiation slots, and a feeding port. By modifying the number of the radiation slots, the characteristics of the slot waveguide antenna become changed. The antenna gain of up to 17.5 dBi and a beamwidth of 1.8° can be achieved for an operational frequency of 300 GHz bands. The proposed antenna is promising for wireless THz and optical fiber front ends by integrating optical modulators or detectors.
{"title":"High-Gain Slotted Waveguide Antennas for Wireless THz and Optical Fiber Front-Ends","authors":"Y. N. Wijayanto, K. Paramayudha, A. Kanno","doi":"10.23919/AT-AP-RASC54737.2022.9814228","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814228","url":null,"abstract":"We design slotted waveguide antennas and observe their characteristics for application in THz bands. The antenna consists of a rectangular waveguide, radiation slots, and a feeding port. By modifying the number of the radiation slots, the characteristics of the slot waveguide antenna become changed. The antenna gain of up to 17.5 dBi and a beamwidth of 1.8° can be achieved for an operational frequency of 300 GHz bands. The proposed antenna is promising for wireless THz and optical fiber front ends by integrating optical modulators or detectors.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"156 11","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120990978","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814321
S. Raman, A. Skrivervik
Planar microstrip resonators suitable for material characterization application are presented in this paper. The prototype consists of three resonators fed through four ports in a planar dielectric substrate without any additional resonators. The resonators are working in different frequency regions making it suitable for resonant based characterization at different frequencies using a single prototype. In this proposed work, the overall dimension of the prototype is 100mm x 50mm when fabricated in a 1.6mm thick FR4 epoxy substrate of dielectric constant 4.4 and loss tangent 0.02. The three resonators are operating within their fundamental mode at 900MHz, 1.8GHz and 2.4GHz respectively. The analysis in this work is carried out on the fundamental electrical mode for all the three resonators, but is similar for the higher order modes. The prototype is highly compact and low cost compared to the conventional cavity based resonant characterization techniques.
{"title":"4-Port Microstrip planar resonator for multiband microwave material characterization applications","authors":"S. Raman, A. Skrivervik","doi":"10.23919/AT-AP-RASC54737.2022.9814321","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814321","url":null,"abstract":"Planar microstrip resonators suitable for material characterization application are presented in this paper. The prototype consists of three resonators fed through four ports in a planar dielectric substrate without any additional resonators. The resonators are working in different frequency regions making it suitable for resonant based characterization at different frequencies using a single prototype. In this proposed work, the overall dimension of the prototype is 100mm x 50mm when fabricated in a 1.6mm thick FR4 epoxy substrate of dielectric constant 4.4 and loss tangent 0.02. The three resonators are operating within their fundamental mode at 900MHz, 1.8GHz and 2.4GHz respectively. The analysis in this work is carried out on the fundamental electrical mode for all the three resonators, but is similar for the higher order modes. The prototype is highly compact and low cost compared to the conventional cavity based resonant characterization techniques.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121320245","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814428
G. M. Battaglia, T. Isernia, A. Morabito, R. Palmeri, R. Vitiello
The paper deals with high performance scanning antennas for satellite applications. By referring to array antennas, we propose an optimal synthesis approach able to determine the excitations of the array elements that can be reconfigured with tunable metamaterials for the realization of beam scanning. The achieved results are satisfactory and show improvements with respect to benchmark state of the art. Then, slot array antennas have been identified as possible realization technology in conjunction with electrically tunable nanomaterials. A preliminary characterization of the loaded-slot in terms of radiated power is presented.
{"title":"Innovative Antenna Solutions for Satellite Telecommunications","authors":"G. M. Battaglia, T. Isernia, A. Morabito, R. Palmeri, R. Vitiello","doi":"10.23919/AT-AP-RASC54737.2022.9814428","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814428","url":null,"abstract":"The paper deals with high performance scanning antennas for satellite applications. By referring to array antennas, we propose an optimal synthesis approach able to determine the excitations of the array elements that can be reconfigured with tunable metamaterials for the realization of beam scanning. The achieved results are satisfactory and show improvements with respect to benchmark state of the art. Then, slot array antennas have been identified as possible realization technology in conjunction with electrically tunable nanomaterials. A preliminary characterization of the loaded-slot in terms of radiated power is presented.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"186 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124926758","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814196
Chandrani Chatterjee, Saurabh Das
Climate change and resulting increase in extreme events have become major sources of concern for the society today. Rainfall cycle and lightning extremities are among the most evidenced effects of recent climatic changes. However, quantifying the climate change effect over a region is challenging especially for a country like India with such enormous topographic and climatic variabilities. The current work attempted to regionalize Indian subcontinent based on the major climatic factors using machine learning techniques. The resulting regions have showed distinct interrelationship between the climate variable. Two regions showed significant increasing trend in number of extreme rainfall days(>40 mm) whereas, two other showed decreasing trends.
{"title":"Climate regionalization to assess change in extreme rainfall over Indian subcontinent","authors":"Chandrani Chatterjee, Saurabh Das","doi":"10.23919/AT-AP-RASC54737.2022.9814196","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814196","url":null,"abstract":"Climate change and resulting increase in extreme events have become major sources of concern for the society today. Rainfall cycle and lightning extremities are among the most evidenced effects of recent climatic changes. However, quantifying the climate change effect over a region is challenging especially for a country like India with such enormous topographic and climatic variabilities. The current work attempted to regionalize Indian subcontinent based on the major climatic factors using machine learning techniques. The resulting regions have showed distinct interrelationship between the climate variable. Two regions showed significant increasing trend in number of extreme rainfall days(>40 mm) whereas, two other showed decreasing trends.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125897691","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814271
A. Brancaccio, G. Leone, R. Solimene
Experimental results concerning the detection and localization of shallow buried targets are shown. The imaging method relies on a convenient two dimensional mathematical formulation, in which the third spatial dimension, that is the depth, is neglected. The input data are bistatic measurements, where the source is fixed and the receiving antenna moves onto a plane parallel to the air/ground interface. Each set of spatial measurements is taken at one single frequency. The use of several sets, taken at different frequencies, allows to perform detection and localization with few (undersampled) spatial data.
{"title":"Detection and localization of shallow buried targets: experimental results","authors":"A. Brancaccio, G. Leone, R. Solimene","doi":"10.23919/AT-AP-RASC54737.2022.9814271","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814271","url":null,"abstract":"Experimental results concerning the detection and localization of shallow buried targets are shown. The imaging method relies on a convenient two dimensional mathematical formulation, in which the third spatial dimension, that is the depth, is neglected. The input data are bistatic measurements, where the source is fixed and the receiving antenna moves onto a plane parallel to the air/ground interface. Each set of spatial measurements is taken at one single frequency. The use of several sets, taken at different frequencies, allows to perform detection and localization with few (undersampled) spatial data.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116069478","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814328
Y. Tsuji, K. Morimoto, A. Iguchi, T. Kashiwa
In this paper, we present a topology optimization method for designing plasmonic devices. We employ the function expansion method to express a device structure in a design region because arbitrary structure can be expressed with relatively few design variables. In addition, we employ CMA-ES for optimizing the design variables.
{"title":"Topology Optimization of Plasmonic Device Using Function Expansion Method and CMA-ES","authors":"Y. Tsuji, K. Morimoto, A. Iguchi, T. Kashiwa","doi":"10.23919/AT-AP-RASC54737.2022.9814328","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814328","url":null,"abstract":"In this paper, we present a topology optimization method for designing plasmonic devices. We employ the function expansion method to express a device structure in a design region because arbitrary structure can be expressed with relatively few design variables. In addition, we employ CMA-ES for optimizing the design variables.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122895492","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814318
D. Rodriguez-Duarte, J. T. Tobon Vasquez, F. Vipiana
This paper introduces a numerical and experimental assessment of the microwave device capabilities to perform continuous real-time imaging-based monitoring of a brain stroke, exploiting a differential measuring scheme of the scattering matrices and the distorted Born approximation. The device works around 1 GHz and consists of a low-complexity 22-antenna-array composed of custom-made wearable elements. The imaging kernel is built using an average-head reference scenario computed off-line via accurate numerical models and an in-house finite element method electromagnetic solver. The validation follows the progression of emulated evolving hemorrhagic stroke condition, including tests with both an average single-tissue head model and a multi-tissue one in the numerical part and the average scenario in the experimental one. The results show the system’s capacity to localize and track the shape changes of the stroke-affected area in all studied cases.
{"title":"Moving Forward to Real-time Imaging-based Monitoring of Cerebrovascular Diseases Using a Microwave Device: Numerical and Experimental Validation","authors":"D. Rodriguez-Duarte, J. T. Tobon Vasquez, F. Vipiana","doi":"10.23919/AT-AP-RASC54737.2022.9814318","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814318","url":null,"abstract":"This paper introduces a numerical and experimental assessment of the microwave device capabilities to perform continuous real-time imaging-based monitoring of a brain stroke, exploiting a differential measuring scheme of the scattering matrices and the distorted Born approximation. The device works around 1 GHz and consists of a low-complexity 22-antenna-array composed of custom-made wearable elements. The imaging kernel is built using an average-head reference scenario computed off-line via accurate numerical models and an in-house finite element method electromagnetic solver. The validation follows the progression of emulated evolving hemorrhagic stroke condition, including tests with both an average single-tissue head model and a multi-tissue one in the numerical part and the average scenario in the experimental one. The results show the system’s capacity to localize and track the shape changes of the stroke-affected area in all studied cases.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117253193","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814295
E. Chernokozhin, A. Boag
A method for direct inversion of the EFIE operator is proposed. The method is based on the Multilevel Nonuniform Grid (MLNG) approach, which previously has been successfully used in fast iterative solvers. However, the MLNG approach is also suitable for direct solvers. The efficiency of the method stems from the fact that the direct inversion of MLNG-compressed integral operators reduces to the inversion of banded matrices.
{"title":"Direct Inversion of the MLNG Field Evaluation Operator for Fast Solution of Electromagnetic Scattering Problems","authors":"E. Chernokozhin, A. Boag","doi":"10.23919/AT-AP-RASC54737.2022.9814295","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814295","url":null,"abstract":"A method for direct inversion of the EFIE operator is proposed. The method is based on the Multilevel Nonuniform Grid (MLNG) approach, which previously has been successfully used in fast iterative solvers. However, the MLNG approach is also suitable for direct solvers. The efficiency of the method stems from the fact that the direct inversion of MLNG-compressed integral operators reduces to the inversion of banded matrices.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129698078","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 : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814256
Yu Katsuue, Yusuke Tanaka, K. Inagaki, A. Kanno, N. Sekine, Ayumu Yabuki, Junichi Nakajima, S. Hisatake
We demonstrate the stacked metal hole array (MHA) with the gain enhancement bandwidth of 10 GHz at 300 GHz band based on the simulation (CST STUDIO SUITE). The antenna gain enhancement of about 2 dB was obtained by placing the stacked MHA in front of a conical horn antenna.
在CST STUDIO SUITE仿真的基础上，我们展示了300 GHz频段增益增强带宽为10 GHz的堆叠金属孔阵列(MHA)。在锥形喇叭天线前放置堆叠的MHA，天线增益提高约2db。
{"title":"Stacked metal hole array as an antenna gain enhancer at 300 GHz band","authors":"Yu Katsuue, Yusuke Tanaka, K. Inagaki, A. Kanno, N. Sekine, Ayumu Yabuki, Junichi Nakajima, S. Hisatake","doi":"10.23919/AT-AP-RASC54737.2022.9814256","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814256","url":null,"abstract":"We demonstrate the stacked metal hole array (MHA) with the gain enhancement bandwidth of 10 GHz at 300 GHz band based on the simulation (CST STUDIO SUITE). The antenna gain enhancement of about 2 dB was obtained by placing the stacked MHA in front of a conical horn antenna.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128572772","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：