Pub Date : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105132
W. Ding, Z. Sheng, S. Mondal, Q. Wei, H. Hafez, M. A. Fareed, A. Laramée, X. Ropagnol, G. Zhang, S. Sun, J. Zhang, T. Ozaki, S. Gao
We investigate intense broadband terahertz radiation generation based the interaction of high intensity ultrashort laser with solid plasma. THz pulse with electric field of hundreds of MV/cm are generated using laser with intensity of about 1018 W/cm2. Theoretical model, simulations agree well with experiments, and reveal that the THz radiation is coherent transition radiation by hot electrons produced in laser-plasma interaction. We have studied both planar and nanorod array targets, latter of which efficiently enhance the intensity and directionality of the THz source.
{"title":"Intense THz-coherent transition radiation from laser solid plasma interaction","authors":"W. Ding, Z. Sheng, S. Mondal, Q. Wei, H. Hafez, M. A. Fareed, A. Laramée, X. Ropagnol, G. Zhang, S. Sun, J. Zhang, T. Ozaki, S. Gao","doi":"10.23919/URSIGASS.2017.8105132","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105132","url":null,"abstract":"We investigate intense broadband terahertz radiation generation based the interaction of high intensity ultrashort laser with solid plasma. THz pulse with electric field of hundreds of MV/cm are generated using laser with intensity of about 1018 W/cm2. Theoretical model, simulations agree well with experiments, and reveal that the THz radiation is coherent transition radiation by hot electrons produced in laser-plasma interaction. We have studied both planar and nanorod array targets, latter of which efficiently enhance the intensity and directionality of the THz source.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115644757","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105302
M. Sergeeva, O. Maltseva, J. Gonzalez-Esparza, V. De la Luz, P. Corona-Romero
The ionosphere behaviour over Mexico was studied. We analysed variations of Total Electron Content (TEC) and critical frequency of F2-layer of the ionosphere (foF2). TEC values were extracted from data of local GNSS receivers and if missed then from global ionospheric maps. foF2 values were reconstructed using TEC measured over Mexico and equivalent slab thickness of the ionosphere measured in the adjacent to Mexico regions having ionosondes. Diurnal and seasonal patterns of TEC and foF2 behaviour over Mexico were revealed. The peculiarity of TEC behaviour during disturbances were studied. The presence of strong positive enhancements is a characteristic feature for Mexico that is confirmed by measurements of electron concentration at satellites CHAMP and DSMP.
{"title":"Estimates of ionosphere state over Mexico with TEC data","authors":"M. Sergeeva, O. Maltseva, J. Gonzalez-Esparza, V. De la Luz, P. Corona-Romero","doi":"10.23919/URSIGASS.2017.8105302","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105302","url":null,"abstract":"The ionosphere behaviour over Mexico was studied. We analysed variations of Total Electron Content (TEC) and critical frequency of F2-layer of the ionosphere (foF2). TEC values were extracted from data of local GNSS receivers and if missed then from global ionospheric maps. foF2 values were reconstructed using TEC measured over Mexico and equivalent slab thickness of the ionosphere measured in the adjacent to Mexico regions having ionosondes. Diurnal and seasonal patterns of TEC and foF2 behaviour over Mexico were revealed. The peculiarity of TEC behaviour during disturbances were studied. The presence of strong positive enhancements is a characteristic feature for Mexico that is confirmed by measurements of electron concentration at satellites CHAMP and DSMP.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115670059","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105116
T. Sarkar, A. Maitra
The characteristics of high velocity small drops (super-terminal) are observed during different types of rain in a tropical region, Kolkata. Measurements using a Laser Precipitation Monitor (LPM) for several rain events spanning the monsoon season of 2013 at Kolkata, India, shows that the presence of high velocity small drops is significant in tropical convection. Additionally, the fraction of super-terminal drops in natural rain is found to decrease with increasing rain rate. The decrease of superterminal drops in high rain intensities, implies increase in rain drop coalescence over drop break up.
{"title":"Characteristics of high velocity small drops in tropical convective rain","authors":"T. Sarkar, A. Maitra","doi":"10.23919/URSIGASS.2017.8105116","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105116","url":null,"abstract":"The characteristics of high velocity small drops (super-terminal) are observed during different types of rain in a tropical region, Kolkata. Measurements using a Laser Precipitation Monitor (LPM) for several rain events spanning the monsoon season of 2013 at Kolkata, India, shows that the presence of high velocity small drops is significant in tropical convection. Additionally, the fraction of super-terminal drops in natural rain is found to decrease with increasing rain rate. The decrease of superterminal drops in high rain intensities, implies increase in rain drop coalescence over drop break up.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124369709","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105004
J. Heraud, V. Centa, T. Bleier
Different manifestations of electromagnetic phenomena have been reported in the scientific literature for many years, linking them with seismic events, from large to even 3.0 Ml earthquakes. Examples are pre-seismic and co-seismic luminescence, various forms of electric charge displacement and magnetic fields, stress generated electromagnetic pulses, radio wave generation by accelerated charges at different frequencies and even strange animal behavior. In this paper, we report several events of electromagnetic pulses associated with seismic events and registered by magnetometers and analyze several cases of EM phenomena leading to the determination of the physical morphology and other physical aspects of the lithosphere from passive reception of pulses associated with earthquakes.
{"title":"Images of the benioff zone in the lithosphere using electromagnetic energy released from stress in tectonic plates","authors":"J. Heraud, V. Centa, T. Bleier","doi":"10.23919/URSIGASS.2017.8105004","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105004","url":null,"abstract":"Different manifestations of electromagnetic phenomena have been reported in the scientific literature for many years, linking them with seismic events, from large to even 3.0 Ml earthquakes. Examples are pre-seismic and co-seismic luminescence, various forms of electric charge displacement and magnetic fields, stress generated electromagnetic pulses, radio wave generation by accelerated charges at different frequencies and even strange animal behavior. In this paper, we report several events of electromagnetic pulses associated with seismic events and registered by magnetometers and analyze several cases of EM phenomena leading to the determination of the physical morphology and other physical aspects of the lithosphere from passive reception of pulses associated with earthquakes.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124381416","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105037
Á. Coves, S. Marini, B. Gimeno, D. Sánchez, Ana Rodríguez, V. Boria
A high-efficiency narrow-band filter based on a Dielectric Frequency-Selective Surface (DFSS) has been predicted theoretically for oblique plane-wave incidence. A DFSS showing total reflection at a frequency of 10.5 GHz, based on the Brewster phenomenon for TM polarization, has been designed with a single dielectric grating, showing extremely low-reflectance sidebands adjacent to the resonance peak. The angular and spectral response of the designed filter has been studied. In addition, dielectric ohmic losses have been accounted for in this structure.
{"title":"Design of a narrow-band filter based on the Brewster phenomenon for microwave applications","authors":"Á. Coves, S. Marini, B. Gimeno, D. Sánchez, Ana Rodríguez, V. Boria","doi":"10.23919/URSIGASS.2017.8105037","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105037","url":null,"abstract":"A high-efficiency narrow-band filter based on a Dielectric Frequency-Selective Surface (DFSS) has been predicted theoretically for oblique plane-wave incidence. A DFSS showing total reflection at a frequency of 10.5 GHz, based on the Brewster phenomenon for TM polarization, has been designed with a single dielectric grating, showing extremely low-reflectance sidebands adjacent to the resonance peak. The angular and spectral response of the designed filter has been studied. In addition, dielectric ohmic losses have been accounted for in this structure.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116649518","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105084
K. Achouri, C. Caloz
We discuss our most recent developments in the synthesis and the analysis of metasurfaces as well as their potential applications. We present a list of selected topics which includes the electromagnetic synthesis of metasurfaces and the applications of birefringence and bianisotropy. Several applications are discussed, among which, are the light emission enhancement of single photon source, metasur-face with controllable angular scattering and metasurface solar sail for the control of radiation pressure.
{"title":"Recent developments in metasurface design and applications","authors":"K. Achouri, C. Caloz","doi":"10.23919/URSIGASS.2017.8105084","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105084","url":null,"abstract":"We discuss our most recent developments in the synthesis and the analysis of metasurfaces as well as their potential applications. We present a list of selected topics which includes the electromagnetic synthesis of metasurfaces and the applications of birefringence and bianisotropy. Several applications are discussed, among which, are the light emission enhancement of single photon source, metasur-face with controllable angular scattering and metasurface solar sail for the control of radiation pressure.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116948860","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105228
Y. Rahmat-Samii, J. Kovitz
Integrating antenna pattern measurements in the classroom offers many captivating insights about electromagnetic fields that is visually appealing to young scientists and students. In particular, the planar near-field measurement techniques allow instructors to connect to fundamental knowledge about antennas. Challenging concepts become immediately a hands-on discussion while providing students an important application of fundamental electrical engineering and electromagnetic theories. Our table-top bipolar apparatus also brings out a discussion on the challenges of measurements at high frequencies, such as mmWaves, where cable movement and flexing can cause significant errors. This paper suggests planar near-field measurements as an educational paradigm linking electromagnetic theory, sampling techniques, and FFT.
{"title":"Antenna measurements through planar near field apparatus: An educational paradigm linking electromagnetic theory, sampling techniques, and FFT","authors":"Y. Rahmat-Samii, J. Kovitz","doi":"10.23919/URSIGASS.2017.8105228","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105228","url":null,"abstract":"Integrating antenna pattern measurements in the classroom offers many captivating insights about electromagnetic fields that is visually appealing to young scientists and students. In particular, the planar near-field measurement techniques allow instructors to connect to fundamental knowledge about antennas. Challenging concepts become immediately a hands-on discussion while providing students an important application of fundamental electrical engineering and electromagnetic theories. Our table-top bipolar apparatus also brings out a discussion on the challenges of measurements at high frequencies, such as mmWaves, where cable movement and flexing can cause significant errors. This paper suggests planar near-field measurements as an educational paradigm linking electromagnetic theory, sampling techniques, and FFT.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121133182","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105008
M. Ryabkova, V. Karaev, Yuriy A. Titchenko, E. Meshkov
Measurements of the sea surface backscatter at low incidence angles were performed using Ka-band Doppler radars from the offshore platform in the Black Sea in October of 2016. One of the radars has a symmetrical antenna beam; the other one has a knife-like antenna beam. Incidence angles varied from nadir to 20° during experiments. In this paper the first results of experimental data processing are presented and the dependency of Doppler frequency shift, Doppler width and radar cross section on incidence angle are analyzed. Data acquired in the experiments can be used for validation of theoretical models.
{"title":"Experimental study of the microwave radar Doppler spectrum backscattered from the sea surface at low incidence angles","authors":"M. Ryabkova, V. Karaev, Yuriy A. Titchenko, E. Meshkov","doi":"10.23919/URSIGASS.2017.8105008","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105008","url":null,"abstract":"Measurements of the sea surface backscatter at low incidence angles were performed using Ka-band Doppler radars from the offshore platform in the Black Sea in October of 2016. One of the radars has a symmetrical antenna beam; the other one has a knife-like antenna beam. Incidence angles varied from nadir to 20° during experiments. In this paper the first results of experimental data processing are presented and the dependency of Doppler frequency shift, Doppler width and radar cross section on incidence angle are analyzed. Data acquired in the experiments can be used for validation of theoretical models.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124925109","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105266
Sandro Chiocchio, A. Persia, F. Santucci, F. Graziosi, M. Faccio
The RTCA DO-260B document has stimulated since a few years ago the adoption of novel algorithms to improve the ability of receivers to detect and decode ADS-B signals, with particular emphasis on preamble detection, declaration of bit state and confidence level, detection and correction of errors. Motivated by an industry-driven project, this paper reports on performance analysis of a set of enhanced techniques that we have developed for detection and decoding of ADS-B signals transmitted on 1090 MHz carrier frequency in high interference conditions. An extensive set of results has been derived through a specifically developed simulation environment, that is able to implement the features of both linear and logarithmic amplifier stages in the RF receiver architecture.
{"title":"Modeling and performance analysis of advanced detection architectures for ADS-B signals in high interference environments","authors":"Sandro Chiocchio, A. Persia, F. Santucci, F. Graziosi, M. Faccio","doi":"10.23919/URSIGASS.2017.8105266","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105266","url":null,"abstract":"The RTCA DO-260B document has stimulated since a few years ago the adoption of novel algorithms to improve the ability of receivers to detect and decode ADS-B signals, with particular emphasis on preamble detection, declaration of bit state and confidence level, detection and correction of errors. Motivated by an industry-driven project, this paper reports on performance analysis of a set of enhanced techniques that we have developed for detection and decoding of ADS-B signals transmitted on 1090 MHz carrier frequency in high interference conditions. An extensive set of results has been derived through a specifically developed simulation environment, that is able to implement the features of both linear and logarithmic amplifier stages in the RF receiver architecture.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124967499","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 : 2017-08-01DOI: 10.23919/URSIGASS.2017.8105355
S. Rotenberg, Pascual D. Hilario Re, S. Podilchak, G. Goussetis, Jaesup Lee
This paper describes the design and measurement of a full-bridge rectifier and a receiving antenna array operating at 2.4 GHz for wireless power transmission system applications, and with motivations to wirelessly charge an electronic device in the radiating near-field. A retrodirective antenna array (RDA) was also used in the system with high power gain to boost the overall received RF power at the input of the rectenna. In particular, the RDA offered automatic tracking of the rectenna module in 3D space by employing phase conjugating mixers. The diode rectifier of our rectenna, which is the focus of the present work, offers full-wave-rectification and exhibits a 76% efficiency for an RF input power of 26 dBm and 74% at 27 dBm, while also providing more than 60% of RF-to-DC conversion efficiency at 2.4 GHz when considering an input RF power level ranging from 15 dBm to 29 dBm.
{"title":"An efficient rectifier for an RDA wireless power transmission system operating at 2.4 GHz","authors":"S. Rotenberg, Pascual D. Hilario Re, S. Podilchak, G. Goussetis, Jaesup Lee","doi":"10.23919/URSIGASS.2017.8105355","DOIUrl":"https://doi.org/10.23919/URSIGASS.2017.8105355","url":null,"abstract":"This paper describes the design and measurement of a full-bridge rectifier and a receiving antenna array operating at 2.4 GHz for wireless power transmission system applications, and with motivations to wirelessly charge an electronic device in the radiating near-field. A retrodirective antenna array (RDA) was also used in the system with high power gain to boost the overall received RF power at the input of the rectenna. In particular, the RDA offered automatic tracking of the rectenna module in 3D space by employing phase conjugating mixers. The diode rectifier of our rectenna, which is the focus of the present work, offers full-wave-rectification and exhibits a 76% efficiency for an RF input power of 26 dBm and 74% at 27 dBm, while also providing more than 60% of RF-to-DC conversion efficiency at 2.4 GHz when considering an input RF power level ranging from 15 dBm to 29 dBm.","PeriodicalId":377869,"journal":{"name":"2017 XXXIInd General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS)","volume":"269 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123304973","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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