Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292810
J. M. Neves;L. M. Pessoa;H. M. Salgado
In this work, a novel patch antenna fed by a CPW square loop feed, was design in HFSS to work at a centre frequency of 100 GHz, having a minimum requirement of at least 5 percent offractional bandwidth. An end launch connector, up to 110 GHz, was used for measurement purposes, imposing the design of a GCPW-to-CPW transition, as well as a TRL calibration kit. The antenna and calibration kit were fabricated in RT/duroid 5880 substrate with 0.127 mm of thickness. The experimentally obtained −10 dB impedance bandwidth was 6.7 GHz (versus 7.66 GHz simulated) and the measured peak gain at 100 GHz was 6.3 dBi (versus 6.1 dBi simulated).
{"title":"Antenna element operating at 100 GHz","authors":"J. M. Neves;L. M. Pessoa;H. M. Salgado","doi":"10.23919/URSIRSB.2021.10292810","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292810","url":null,"abstract":"In this work, a novel patch antenna fed by a CPW square loop feed, was design in HFSS to work at a centre frequency of 100 GHz, having a minimum requirement of at least 5 percent offractional bandwidth. An end launch connector, up to 110 GHz, was used for measurement purposes, imposing the design of a GCPW-to-CPW transition, as well as a TRL calibration kit. The antenna and calibration kit were fabricated in RT/duroid 5880 substrate with 0.127 mm of thickness. The experimentally obtained −10 dB impedance bandwidth was 6.7 GHz (versus 7.66 GHz simulated) and the measured peak gain at 100 GHz was 6.3 dBi (versus 6.1 dBi simulated).","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"29-35"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292810.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68077997","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}
Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292763
Peter Van Daele
Dear Colleagues, Dear Radioscientists, All of us in the URSI community and beyond were shocked by the passing away of Dr. Ross Stone, the Editor of the Radio Science Bulletin, also serving as URSI Assistant Secretary General for GASS and Publications. Ross has been an URSI scientist for many decades and was committed to contribute and serve our community.
{"title":"Announcement of the final issue of the RSB by the URSI secretary general","authors":"Peter Van Daele","doi":"10.23919/URSIRSB.2021.10292763","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292763","url":null,"abstract":"Dear Colleagues, Dear Radioscientists, All of us in the URSI community and beyond were shocked by the passing away of Dr. Ross Stone, the Editor of the Radio Science Bulletin, also serving as URSI Assistant Secretary General for GASS and Publications. Ross has been an URSI scientist for many decades and was committed to contribute and serve our community.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"10-10"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292763.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078003","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}
We have analyzed an isolated, multicellular thunderstorm event with heavy precipitation (∼100 mm/h) that occurred in Saitama, Japan. The X-band multi-parameter radar-derived 3D volume scan and ground-based total lightning data provide detailed spatio-temporal dependences of precipitation cores in different altitudes and associated different types of lightning. We found the development of high altitude (∼7–10 km) precipitation core shows a high correlation with the in-cloud lightning rate and the peak of IC lightning occurred 5–10 min prior to subsequent heavy precipitation on the ground. Again, ground precipitation shows a higher correlation with −CG than +CG without significant time lag. Therefore, monitoring total lightning activity during thunderstorms can be useful for nowcasting and short-time prediction of ground precipitation volume.
{"title":"Thunderstorms and total lightning characteristics causing heavy precipitation in Japan: A case study","authors":"Debrupa Mondai;Yasuhide Hobara;Hiroshi Kikuchi;Jeff Lapierre","doi":"10.23919/URSIRSB.2021.10292817","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292817","url":null,"abstract":"We have analyzed an isolated, multicellular thunderstorm event with heavy precipitation (∼100 mm/h) that occurred in Saitama, Japan. The X-band multi-parameter radar-derived 3D volume scan and ground-based total lightning data provide detailed spatio-temporal dependences of precipitation cores in different altitudes and associated different types of lightning. We found the development of high altitude (∼7–10 km) precipitation core shows a high correlation with the in-cloud lightning rate and the peak of IC lightning occurred 5–10 min prior to subsequent heavy precipitation on the ground. Again, ground precipitation shows a higher correlation with −CG than +CG without significant time lag. Therefore, monitoring total lightning activity during thunderstorms can be useful for nowcasting and short-time prediction of ground precipitation volume.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"70-76"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292817.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68177658","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}
Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292823
James C. Lin
The incidents of sonic attacks on diplomatic personnel in Havana, Cuba, may likely remain a mystery until some culprit(s) are caught in the act [1]. The one-time diplomatic affair, Havana Syndrome, has apparently transformed into a weapons research program in the United States [2]. Indeed, it appears that research in high-power microwaves has persisted worldwide, including some of the major military powers [3, 4].
{"title":"Telecommunications health and safety: Research in high-power microwave weapons","authors":"James C. Lin","doi":"10.23919/URSIRSB.2021.10292823","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292823","url":null,"abstract":"The incidents of sonic attacks on diplomatic personnel in Havana, Cuba, may likely remain a mystery until some culprit(s) are caught in the act [1]. The one-time diplomatic affair, Havana Syndrome, has apparently transformed into a weapons research program in the United States [2]. Indeed, it appears that research in high-power microwaves has persisted worldwide, including some of the major military powers [3, 4].","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"88-90"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292823.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70609889","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}
Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292820
Bruno Zolesi;Mike Hapgood
Dr. Ljiljana R. Cander suddenly passed away March 16, 2022, after a life devoted and dedicated to science. She was born on June 17, 1946, in Nishka Banja, former Yugoslavia. After moving with her family to Grocka, she was awarded a BSc in Electrical Engineering in 1970, an MSc in Plasma Physics in 1974, and a PhD in Ionospheric Research at Belgrade University in 1984.
{"title":"In memoriam: Dr. Ljiljana R. Cander","authors":"Bruno Zolesi;Mike Hapgood","doi":"10.23919/URSIRSB.2021.10292820","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292820","url":null,"abstract":"Dr. Ljiljana R. Cander suddenly passed away March 16, 2022, after a life devoted and dedicated to science. She was born on June 17, 1946, in Nishka Banja, former Yugoslavia. After moving with her family to Grocka, she was awarded a BSc in Electrical Engineering in 1970, an MSc in Plasma Physics in 1974, and a PhD in Ionospheric Research at Belgrade University in 1984.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"84-84"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292820.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70609897","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}
Commission H led a joint session with Commissions E and G at the 2022 AT-AP-RASC meeting entitled "Meet the Experts." The session was designed especially to give early career scientists an opportunity to hear the career perspectives from three established researchers in their respective fields. Each expert gave a 20 minute presentation about their experiences and thoughts on the present state of the field, as well as where the future of the research field is headed. The formal presentations were then followed by an hour of questions from the audience.
{"title":"Early career representative column: Recap of commissions HGE meet the experts session","authors":"Nosherwan Shoaib;Miroslav Hanzelka;Claudia Martinez;Bruce Fritz;Chaouki Kasmi","doi":"10.23919/URSIRSB.2021.10292824","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292824","url":null,"abstract":"Commission H led a joint session with Commissions E and G at the 2022 AT-AP-RASC meeting entitled \"Meet the Experts.\" The session was designed especially to give early career scientists an opportunity to hear the career perspectives from three established researchers in their respective fields. Each expert gave a 20 minute presentation about their experiences and thoughts on the present state of the field, as well as where the future of the research field is headed. The formal presentations were then followed by an hour of questions from the audience.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"91-92"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292824.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68176328","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}
It is becoming increasingly relevant to use wireless communications in subway tunnels to gather sensors data for advanced maintenance and security purposes. In this work, we present a propagation survey over IoT radio bands using LoRa modulation in Lisbon's Subway. Several scenarios such as straight and curved tunnels, bifurcations, and partial tunnel obstructions were considered. Measurements were taken with LoRa modulation with a transmitter and receiver set to 868 MHz with spreading factors from 7 to 12. The transmit power was 14 dBm, and half-wave whip antennas with vertical polarization were used. Based on the measurement results and the COST-231 two-slope propagation model, a loss factor of 58.5 dB/km and 80.5 dB/km, were obtained respectively, for unobstructed curved and bifurcation tunnels. An extra attenuation of 10 dB was observed for partial tunnel obstruction by one loaded convoy. The results of this study indicate that using a legal transmission power and for straight and curved tunnels, communication can be maintained for distances exceeding one kilometre.
{"title":"An IoT radio coverage survey in subway tunnels","authors":"Catarina Sousa;Cláudia Alves;João Casaleiro;António Serrador","doi":"10.23919/URSIRSB.2021.10292809","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292809","url":null,"abstract":"It is becoming increasingly relevant to use wireless communications in subway tunnels to gather sensors data for advanced maintenance and security purposes. In this work, we present a propagation survey over IoT radio bands using LoRa modulation in Lisbon's Subway. Several scenarios such as straight and curved tunnels, bifurcations, and partial tunnel obstructions were considered. Measurements were taken with LoRa modulation with a transmitter and receiver set to 868 MHz with spreading factors from 7 to 12. The transmit power was 14 dBm, and half-wave whip antennas with vertical polarization were used. Based on the measurement results and the COST-231 two-slope propagation model, a loss factor of 58.5 dB/km and 80.5 dB/km, were obtained respectively, for unobstructed curved and bifurcation tunnels. An extra attenuation of 10 dB was observed for partial tunnel obstruction by one loaded convoy. The results of this study indicate that using a legal transmission power and for straight and curved tunnels, communication can be maintained for distances exceeding one kilometre.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"22-28"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292809.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68177660","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}
Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292826
Tobias G. W. Verhulst;Giorgiana De Franceschi;Claudio Cesaroni
During the AT-AP-RASC 2022, a special session was organized dedicated to the ionospheric effects of the exceptional January 2022 eruption of the Hunga volcano in Tonga. This spectacular event is likely of interest to a wider audience within URSI, outside of only the ionospheric research community. We therefore give here an overview of the various contributions presented during this session. Of course, this is only a brief summary, and interested readers are invited to explore the different publications listed among the references for more detailed insights.
{"title":"Ionospheric effects of the Hunga Tonga volcanic eruption of 15 January 2022","authors":"Tobias G. W. Verhulst;Giorgiana De Franceschi;Claudio Cesaroni","doi":"10.23919/URSIRSB.2021.10292826","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292826","url":null,"abstract":"During the AT-AP-RASC 2022, a special session was organized dedicated to the ionospheric effects of the exceptional January 2022 eruption of the Hunga volcano in Tonga. This spectacular event is likely of interest to a wider audience within URSI, outside of only the ionospheric research community. We therefore give here an overview of the various contributions presented during this session. Of course, this is only a brief summary, and interested readers are invited to explore the different publications listed among the references for more detailed insights.","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"95-98"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292826.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078007","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}
Pub Date : 2021-09-01DOI: 10.23919/URSIRSB.2021.10292829
{"title":"Become an individual member of URSI","authors":"","doi":"10.23919/URSIRSB.2021.10292829","DOIUrl":"https://doi.org/10.23919/URSIRSB.2021.10292829","url":null,"abstract":"","PeriodicalId":101270,"journal":{"name":"URSI Radio Science Bulletin","volume":"2021 378","pages":"102-102"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://ieeexplore.ieee.org/iel7/7873543/10292758/10292829.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"68078004","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}
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