Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814237
M. Barbuto, A. Alú, F. Bilotti, A. Toscano
Recently, great efforts have been made in the research of new enabling technologies for beyond 5G communication systems. In this framework, Reconfigurable Intelligent Surfaces (RISs) are considered as one of the most promising solutions and, thus, they have been the subject of several investigations by both the electromagnetic and the communication communities. In this contribution, we further discuss, from an electromagnetic point of view, about the synthesis of a RIS. In particular, by exploiting the topological properties of vortex modes, we present a possible solution to simplify the synthesis and the reconfigurability of a RIS composed of concentric annular rings.
{"title":"Exploiting Composite Vortices in the Design of Reconfigurable Intelligent Surfaces","authors":"M. Barbuto, A. Alú, F. Bilotti, A. Toscano","doi":"10.23919/AT-AP-RASC54737.2022.9814237","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814237","url":null,"abstract":"Recently, great efforts have been made in the research of new enabling technologies for beyond 5G communication systems. In this framework, Reconfigurable Intelligent Surfaces (RISs) are considered as one of the most promising solutions and, thus, they have been the subject of several investigations by both the electromagnetic and the communication communities. In this contribution, we further discuss, from an electromagnetic point of view, about the synthesis of a RIS. In particular, by exploiting the topological properties of vortex modes, we present a possible solution to simplify the synthesis and the reconfigurability of a RIS composed of concentric annular rings.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"8 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":"132266513","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-RASC54737.2022.9814360
S. Terranova, M. Richter, Neekar M Mohammed, G. Gradoni, G. Tanner
Reconfigurable intelligent surfaces have been recently investigated for their potentials to offer significant performance improvements in the next generation wireless telecommunication systems (5G and beyond / 6G). Intelligent surfaces are programmed to control the electromagnetic propagation and obtain the desired wavefront by tuning the local reflection phase of unit elements. Predicting the electromagnetic propagation in the RIS-assisted wireless channel accurately is a significant challenge for researchers and becomes crucial for Telecom operators to properly allocate the radio resources. We propose the use of an Eulerian ray-tracing method, the Dynamical Energy Analysis (DEA), as a coverage planning tool capable of account for the EM interaction between reconfigurable intelligent surfaces and the surrounding environment. The main characteristics that make DEA suitable for this purpose are discussed and some preliminary results of the reflective surface integration within the DEA code will be presented.
{"title":"Integration of Reconfigurable Intelligent Surfaces in Dynamical Energy Analysis","authors":"S. Terranova, M. Richter, Neekar M Mohammed, G. Gradoni, G. Tanner","doi":"10.23919/AT-AP-RASC54737.2022.9814360","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814360","url":null,"abstract":"Reconfigurable intelligent surfaces have been recently investigated for their potentials to offer significant performance improvements in the next generation wireless telecommunication systems (5G and beyond / 6G). Intelligent surfaces are programmed to control the electromagnetic propagation and obtain the desired wavefront by tuning the local reflection phase of unit elements. Predicting the electromagnetic propagation in the RIS-assisted wireless channel accurately is a significant challenge for researchers and becomes crucial for Telecom operators to properly allocate the radio resources. We propose the use of an Eulerian ray-tracing method, the Dynamical Energy Analysis (DEA), as a coverage planning tool capable of account for the EM interaction between reconfigurable intelligent surfaces and the surrounding environment. The main characteristics that make DEA suitable for this purpose are discussed and some preliminary results of the reflective surface integration within the DEA code will be presented.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"55 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":"133896350","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-RASC54737.2022.9814251
F. Prol
This work provides a brief overview of the main challenges found by the author when developing a global ionospheric electron density estimation using tomography and Global Navigation Satellite System (GNSS) data.
{"title":"Challenges of Global-Scale Ionospheric Tomography using GNSS: A brief overview","authors":"F. Prol","doi":"10.23919/AT-AP-RASC54737.2022.9814251","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814251","url":null,"abstract":"This work provides a brief overview of the main challenges found by the author when developing a global ionospheric electron density estimation using tomography and Global Navigation Satellite System (GNSS) data.","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":"130450174","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-RASC54737.2022.9814405
F. Giannetti, A. Vaccaro, Fabiola Sapienza, G. Bacci, V. Lottici, L. Baldini
In this paper, we propose a novel opportunistic multi-satellite sensor system which overcomes the limitations of the conventional single-satellite solutions of the literature. The considerable robustness to the possible unavailability of some satellites, besides being well suited for powerful 2D reconstruction techniques of the rain field, makes it an appealing solution for experimental tests within national and EU-funded research projects.
{"title":"Multi-Satellite Rain Sensing: Design Criteria and Implementation Issues","authors":"F. Giannetti, A. Vaccaro, Fabiola Sapienza, G. Bacci, V. Lottici, L. Baldini","doi":"10.23919/AT-AP-RASC54737.2022.9814405","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814405","url":null,"abstract":"In this paper, we propose a novel opportunistic multi-satellite sensor system which overcomes the limitations of the conventional single-satellite solutions of the literature. The considerable robustness to the possible unavailability of some satellites, besides being well suited for powerful 2D reconstruction techniques of the rain field, makes it an appealing solution for experimental tests within national and EU-funded research projects.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"64 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":"130606404","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-RASC54737.2022.9814354
E. Rojas, D. Hysell
In the present work we summarize our results on simulating Farley–Buneman instabilities for the first time using a fully fluid thermal model.
在本工作中，我们总结了首次使用全流体热模型模拟法利-布曼不稳定性的结果。
{"title":"Fluid simulation of the Farley–Buneman instability","authors":"E. Rojas, D. Hysell","doi":"10.23919/AT-AP-RASC54737.2022.9814354","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814354","url":null,"abstract":"In the present work we summarize our results on simulating Farley–Buneman instabilities for the first time using a fully fluid thermal model.","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":"131155058","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-RASC54737.2022.9814220
Hasan Yetik, Mucahit Kavaklı, U. Uludağ, A. Eksim, S. Paker
This paper summarizes the results of our earthquake localization research, using distributed acoustic sensing (DAS) technology, with two 25 km long dark communication fiber optic cables close to North Anatolian Fault in the Sea of Marmara. In a previous study, we provided detection statistics for over 250 earthquakes, with analysis metrics such as distance to fiber and magnitude. In this paper, we extend these results to include P and S wave lag time-based epicenter distance estimation and localization based on trilateration and provide results on its accuracy, and comparison with data provided by Kandilli Observatory and Earthquake Research Institute – Regional Earthquake-Tsunami Monitoring Center (KOERI). Considering the advantages of the DAS-based seismic monitoring, such as abundant dark fibers that are already available for seismic monitoring, synchronous and distributed data capture capabilities and cost effectiveness, with no need for power supply in the field, DAS based seismic monitoring systems are promising new tools for both detection and epicenter estimation of earthquakes.
{"title":"Earthquake Epicenter Localization Using Fiber Optic Distributed Acoustic Sensing","authors":"Hasan Yetik, Mucahit Kavaklı, U. Uludağ, A. Eksim, S. Paker","doi":"10.23919/AT-AP-RASC54737.2022.9814220","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814220","url":null,"abstract":"This paper summarizes the results of our earthquake localization research, using distributed acoustic sensing (DAS) technology, with two 25 km long dark communication fiber optic cables close to North Anatolian Fault in the Sea of Marmara. In a previous study, we provided detection statistics for over 250 earthquakes, with analysis metrics such as distance to fiber and magnitude. In this paper, we extend these results to include P and S wave lag time-based epicenter distance estimation and localization based on trilateration and provide results on its accuracy, and comparison with data provided by Kandilli Observatory and Earthquake Research Institute – Regional Earthquake-Tsunami Monitoring Center (KOERI). Considering the advantages of the DAS-based seismic monitoring, such as abundant dark fibers that are already available for seismic monitoring, synchronous and distributed data capture capabilities and cost effectiveness, with no need for power supply in the field, DAS based seismic monitoring systems are promising new tools for both detection and epicenter estimation of earthquakes.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"125 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":"131668019","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-RASC54737.2022.9814337
Ahmet Bilir, O. K. Erden, S. Dumanli
Tracking the ablated region in real-time can be advantageous during microwave ablation. In this study, an antenna array that ablates the tissue and monitors the ablation process is proposed. Monitoring is realized by tracking the coupling between the array elements which changes during ablation. That is because the permittivity and conductivity of organic tissues depend on temperature. The proposal is demonstrated through a hepatic tumor example with cascaded thermal and electromagnetic simulations. As the array element, a coaxial slot antenna is designed to operate at 2.45 GHz. The temperature-dependent permittivity and conductivity values are calculated through thermal simulations which contain both healthy and malignant tissues. It has been shown that the application of ablation with an output of 10 W per antenna causes a considerable change in coupling. A 100 MHz shift in frequency and 2.5 dB change in magnitude have been observed after 300 seconds.
{"title":"Coaxial Slot Antenna Array Design for Microwave Ablation and Monitoring","authors":"Ahmet Bilir, O. K. Erden, S. Dumanli","doi":"10.23919/AT-AP-RASC54737.2022.9814337","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814337","url":null,"abstract":"Tracking the ablated region in real-time can be advantageous during microwave ablation. In this study, an antenna array that ablates the tissue and monitors the ablation process is proposed. Monitoring is realized by tracking the coupling between the array elements which changes during ablation. That is because the permittivity and conductivity of organic tissues depend on temperature. The proposal is demonstrated through a hepatic tumor example with cascaded thermal and electromagnetic simulations. As the array element, a coaxial slot antenna is designed to operate at 2.45 GHz. The temperature-dependent permittivity and conductivity values are calculated through thermal simulations which contain both healthy and malignant tissues. It has been shown that the application of ablation with an output of 10 W per antenna causes a considerable change in coupling. A 100 MHz shift in frequency and 2.5 dB change in magnitude have been observed after 300 seconds.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"42 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":"131843145","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-RASC54737.2022.9814422
Yuting Zhao, S. Genovesi, Guliano Manara, F. Costa
A frequency selective surface (FSS) based chipless RFID tag is designed at mm-Wave range. It is shown that the proposed design methodology can provide a multiresonant cross polar spectral signature while exhibiting a significant Radar Cross Section(RCS). Encoding in the cross-polar component of the RCS allows reader to detect the signal from surrounding scatters more easily when presence of metallic objects occurs. The unit cell of employed tag consists of five dipole resonators printed on a grounded dielectric slab, which realized a frequency position coding of 5-bit from 60 GHz to 90 GHz.
{"title":"Frequency-Coded mm-Wave RFID Tags Using Cross Polarization","authors":"Yuting Zhao, S. Genovesi, Guliano Manara, F. Costa","doi":"10.23919/AT-AP-RASC54737.2022.9814422","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814422","url":null,"abstract":"A frequency selective surface (FSS) based chipless RFID tag is designed at mm-Wave range. It is shown that the proposed design methodology can provide a multiresonant cross polar spectral signature while exhibiting a significant Radar Cross Section(RCS). Encoding in the cross-polar component of the RCS allows reader to detect the signal from surrounding scatters more easily when presence of metallic objects occurs. The unit cell of employed tag consists of five dipole resonators printed on a grounded dielectric slab, which realized a frequency position coding of 5-bit from 60 GHz to 90 GHz.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"11 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":"131902552","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-RASC54737.2022.9814178
S. Rodini, S. Genovesi, G. Manara, F. Costa
Stretchable materials are widely used for the realization of various sensors but their radio-frequency behavior is still little explored today. Here an innovative method is proposed that allows to derive the surface impedance of such materials. This parameter is fundamental for obtaining a calibration curve of these materials for their employment as a sensitive element. The proposed method allows to obtain the surface impedance of the material while it is being stretched and is based on a contact-less measurement of the scattering parameters. By exploiting these parameters and thanks to an inversion procedure, it is possible to obtain the value of the surface impedance as the frequency and strain vary.
{"title":"Surface Impedance Estimation of a Stretchable Material","authors":"S. Rodini, S. Genovesi, G. Manara, F. Costa","doi":"10.23919/AT-AP-RASC54737.2022.9814178","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814178","url":null,"abstract":"Stretchable materials are widely used for the realization of various sensors but their radio-frequency behavior is still little explored today. Here an innovative method is proposed that allows to derive the surface impedance of such materials. This parameter is fundamental for obtaining a calibration curve of these materials for their employment as a sensitive element. The proposed method allows to obtain the surface impedance of the material while it is being stretched and is based on a contact-less measurement of the scattering parameters. By exploiting these parameters and thanks to an inversion procedure, it is possible to obtain the value of the surface impedance as the frequency and strain vary.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"142 1-2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132062600","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-RASC54737.2022.9814239
Luciana Rossato Spatafora, P. Savi, R. Alvalá, A. P. Cunha, J. Marengo, Marcelo Zeri, M. Vall-llossera, Miriam Plablos
A model for monitoring agricultural drought (SIMAGRI) has been developed in Brazil. This model is based on gridded precipitation product, real evapotranspiration calculated from vegetation index data (as proposed by [1]), and soil water storage. The soil water storage is derived from the estimation of field capacity and wilting point using pedo-transfer functions (PTFs). The SIMAGRI model suggest that the soil moisture influence is unquestionably a quantitative indicator of drought. In addition, using this model, it is possible to monitor drought episodes in agricultural regions of Brazil, especially over the Northeast, where vulnerability to drought is the highest in the country due to the prevalence of rain fed agricultural practice and frequent droughts.
{"title":"Evaluating the soil moisture retrievals for agricultural drought monitoring over Brazil","authors":"Luciana Rossato Spatafora, P. Savi, R. Alvalá, A. P. Cunha, J. Marengo, Marcelo Zeri, M. Vall-llossera, Miriam Plablos","doi":"10.23919/AT-AP-RASC54737.2022.9814239","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814239","url":null,"abstract":"A model for monitoring agricultural drought (SIMAGRI) has been developed in Brazil. This model is based on gridded precipitation product, real evapotranspiration calculated from vegetation index data (as proposed by [1]), and soil water storage. The soil water storage is derived from the estimation of field capacity and wilting point using pedo-transfer functions (PTFs). The SIMAGRI model suggest that the soil moisture influence is unquestionably a quantitative indicator of drought. In addition, using this model, it is possible to monitor drought episodes in agricultural regions of Brazil, especially over the Northeast, where vulnerability to drought is the highest in the country due to the prevalence of rain fed agricultural practice and frequent droughts.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"5 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":"124305478","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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