Pub Date : 2022-05-29DOI: 10.23919/AT-AP-RASC54737.2022.9814238
S. Georgakopoulos, Abdul-Sattar Kaddour, C. Zekios, Collin Ynchausti, L. Howell, S. Magleby
Multifunctional, deployable, and packable antennas are very important for many applications, including unmanned aerial vehicles, satellite communications (e.g., CubeSats) and general airborne and spaceborne communication systems. Notably, such antennas provide new capabilities for the aforementioned applications. In this work, we present emerging research on foldable and physically reconfigurable antennas, which can morph their shape to adapt and reconfigure their EM performance (e.g., frequency of operation, bandwidth, polarization, beamwidth, etc.).
{"title":"Multifunctional and Deployable Origami Antennas","authors":"S. Georgakopoulos, Abdul-Sattar Kaddour, C. Zekios, Collin Ynchausti, L. Howell, S. Magleby","doi":"10.23919/AT-AP-RASC54737.2022.9814238","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814238","url":null,"abstract":"Multifunctional, deployable, and packable antennas are very important for many applications, including unmanned aerial vehicles, satellite communications (e.g., CubeSats) and general airborne and spaceborne communication systems. Notably, such antennas provide new capabilities for the aforementioned applications. In this work, we present emerging research on foldable and physically reconfigurable antennas, which can morph their shape to adapt and reconfigure their EM performance (e.g., frequency of operation, bandwidth, polarization, beamwidth, etc.).","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"45 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":"114006205","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-RASC54737.2022.9814351
T. T. Thai
Two-Way Satellite Time and Frequency Transfer (TWSTFT) is a technique selected by many timing laboratories around the world for the comparison of atomic clocks and time scales over distance. INRiM Time and Frequency laboratory operates two TWSTFT ground stations, whose data contributes to the calculation of the Coordinated Universal Time (UTC) and to the generation and performance monitoring of the Galileo System Time. This paper presents INRiM TWSTFT recent and future development and experiments.
{"title":"Recent TWSTFT experiments at INRiM Time and Frequency Laboratory","authors":"T. T. Thai","doi":"10.23919/AT-AP-RASC54737.2022.9814351","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814351","url":null,"abstract":"Two-Way Satellite Time and Frequency Transfer (TWSTFT) is a technique selected by many timing laboratories around the world for the comparison of atomic clocks and time scales over distance. INRiM Time and Frequency laboratory operates two TWSTFT ground stations, whose data contributes to the calculation of the Coordinated Universal Time (UTC) and to the generation and performance monitoring of the Galileo System Time. This paper presents INRiM TWSTFT recent and future development and experiments.","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":"129211927","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-RASC54737.2022.9814366
Abhishek Sharma, A. Wong
This paper reports a ternary dielectric Huygens’ metasurface – a metasurface comprising three elements per period, that performs Floquet mode circulation in k-space. We modeled the metasurface as a three-port network, and through full-wave simulation at 28 GHz, we show that the proposed metasurface performs circulation by transforming the FB modes from mode number (+1, 0, -1) to (0, -1, +1), respectively. The corresponding input and output angles are (+33.8◦, 0◦,−33.8◦) and (0◦, −33.8◦,+33.8◦), respectively.
{"title":"Floquet Mode Circulation using a Coarsely Discretized Dielectric Huygens’ Metasurface","authors":"Abhishek Sharma, A. Wong","doi":"10.23919/AT-AP-RASC54737.2022.9814366","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814366","url":null,"abstract":"This paper reports a ternary dielectric Huygens’ metasurface – a metasurface comprising three elements per period, that performs Floquet mode circulation in k-space. We modeled the metasurface as a three-port network, and through full-wave simulation at 28 GHz, we show that the proposed metasurface performs circulation by transforming the FB modes from mode number (+1, 0, -1) to (0, -1, +1), respectively. The corresponding input and output angles are (+33.8<sup>◦</sup>, 0<sup>◦</sup>,−33.8<sup>◦</sup>) and (0<sup>◦</sup>, −33.8<sup>◦</sup>,+33.8<sup>◦</sup>), respectively.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"113 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":"117247373","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-RASC54737.2022.9814307
Wending Mai, Jingwei Xu, P. Werner, D. Werner
When multiple temporal boundaries exist in a temporal system, the characteristic curves of the associated wave equations vary with time. We show that these types of problems can be readily addressed by dividing the entire time frame into several durations and repeatedly applying the d’Alembert formula.
{"title":"Solving Electromagnetic Wave Equations with Time Varying Characteristics Curves","authors":"Wending Mai, Jingwei Xu, P. Werner, D. Werner","doi":"10.23919/AT-AP-RASC54737.2022.9814307","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814307","url":null,"abstract":"When multiple temporal boundaries exist in a temporal system, the characteristic curves of the associated wave equations vary with time. We show that these types of problems can be readily addressed by dividing the entire time frame into several durations and repeatedly applying the d’Alembert formula.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"66 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":"115476090","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-RASC54737.2022.9814305
Jeslin P. Issac, K. Arunachalam
The paper presents the numerical design and analysis of a compact microstrip patch antenna with superstrate for medical microwave radiometry at 1.3 GHz. The antenna design was optimized to obtain at least -10 dB power reflection coefficient, 100 MHz bandwidth centered at 1.3 GHz and localized power reception from deep seated tissue in homogeneous and layered tissue models mimicking the dielectric properties of the breast. Simulation results indicate that the optimized antenna with low loss superstrate meets the design criteria for passive deep tissue thermometry.
{"title":"Design of an impedance matched near field passive antenna for medical microwave radiometry","authors":"Jeslin P. Issac, K. Arunachalam","doi":"10.23919/AT-AP-RASC54737.2022.9814305","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814305","url":null,"abstract":"The paper presents the numerical design and analysis of a compact microstrip patch antenna with superstrate for medical microwave radiometry at 1.3 GHz. The antenna design was optimized to obtain at least -10 dB power reflection coefficient, 100 MHz bandwidth centered at 1.3 GHz and localized power reception from deep seated tissue in homogeneous and layered tissue models mimicking the dielectric properties of the breast. Simulation results indicate that the optimized antenna with low loss superstrate meets the design criteria for passive deep tissue thermometry.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"22 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":"114161355","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-RASC54737.2022.9814193
A. Faustmann, L. Schwardt, V. van Tonder, J. Gilmore, S. Buchner
Polyphase filterbank data of the Vela pulsar is acquired using the MeerKAT radio telescope and analysed using the second-order frequency-frequency polyspectrum. The lack of components off of the non-stationary manifold indicates that the process is second-order stationary over timescales of 0.8 microseconds. Additionally, the complex process is found to be circular and thus requires only a small subset of the possible definitions of the higher-order moments in its characterisation.
{"title":"A Short-Time Stationarity Test of Radio Signals From the Vela Pulsar Using Polyspectra","authors":"A. Faustmann, L. Schwardt, V. van Tonder, J. Gilmore, S. Buchner","doi":"10.23919/AT-AP-RASC54737.2022.9814193","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814193","url":null,"abstract":"Polyphase filterbank data of the Vela pulsar is acquired using the MeerKAT radio telescope and analysed using the second-order frequency-frequency polyspectrum. The lack of components off of the non-stationary manifold indicates that the process is second-order stationary over timescales of 0.8 microseconds. Additionally, the complex process is found to be circular and thus requires only a small subset of the possible definitions of the higher-order moments in its characterisation.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"201 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":"116157451","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-RASC54737.2022.9814416
J. Riley, N. Healy, V. Pacheco-Peña
In this work, we present the design process and response of an ultra-compact plasmonic meniscus lens for Surface Plasmon Polariton (SPP) focusing. To design the lens, we adapted the lens maker equation (a classical optics technique) by introducing the concept of effective media for SPPs traveling within different multilayered media. This adapted equation was then exploited to design a convex-concave lens, also known as a positive meniscus lens, for use in plasmonics. The lens was designed by placing a meniscus-shaped block of silicon nitride (Si3N4) on top of a semi-infinite slab of gold (Au). The performance of the lens is evaluated in detail in terms of the power enhancement, depth of focus, and spatial resolution of the focus. Moreover, the lens robustness is studied using off-axis illumination along with its spectral response, demonstrating how the adapted lens maker equation can be used in the design of such plasmonic meniscus devices.
{"title":"On the performance of plasmonic meniscus lenses for surface plasmon focusing","authors":"J. Riley, N. Healy, V. Pacheco-Peña","doi":"10.23919/AT-AP-RASC54737.2022.9814416","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814416","url":null,"abstract":"In this work, we present the design process and response of an ultra-compact plasmonic meniscus lens for Surface Plasmon Polariton (SPP) focusing. To design the lens, we adapted the lens maker equation (a classical optics technique) by introducing the concept of effective media for SPPs traveling within different multilayered media. This adapted equation was then exploited to design a convex-concave lens, also known as a positive meniscus lens, for use in plasmonics. The lens was designed by placing a meniscus-shaped block of silicon nitride (Si3N4) on top of a semi-infinite slab of gold (Au). The performance of the lens is evaluated in detail in terms of the power enhancement, depth of focus, and spatial resolution of the focus. Moreover, the lens robustness is studied using off-axis illumination along with its spectral response, demonstrating how the adapted lens maker equation can be used in the design of such plasmonic meniscus devices.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"48 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":"127233431","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-RASC54737.2022.9814436
Ángel Luis Zuriarraín Sosa, R. Alesii, F. Santucci
Nowadays, Global Navigation Satellite Systems (GNSS) and complementary positioning technologies are expanding, offering new resources to the localization process. Software Defined Radio (SDR) is emerging as an alternative to developing flexible and multi-technology solutions in a dynamic environment. This work describes the main operational signals in GNSS systems that can be used in a multi-constellation, multi-frequency receiver. Also, it proposes the reception of GNSS signals using a modular architecture based on SDR. The SDR GNSS receiver is confronted with two platforms operating as Front-Ends: ADALM-PLUTO and Ettus USRP X310 - UBX160. The results, corresponding to the capture of GPS signals in the L1 band, show the impact of the platform’s performances in the satellite acquisition signal process.
{"title":"Cross-platform evaluation for Software Defined Radio GNSS receiver","authors":"Ángel Luis Zuriarraín Sosa, R. Alesii, F. Santucci","doi":"10.23919/AT-AP-RASC54737.2022.9814436","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814436","url":null,"abstract":"Nowadays, Global Navigation Satellite Systems (GNSS) and complementary positioning technologies are expanding, offering new resources to the localization process. Software Defined Radio (SDR) is emerging as an alternative to developing flexible and multi-technology solutions in a dynamic environment. This work describes the main operational signals in GNSS systems that can be used in a multi-constellation, multi-frequency receiver. Also, it proposes the reception of GNSS signals using a modular architecture based on SDR. The SDR GNSS receiver is confronted with two platforms operating as Front-Ends: ADALM-PLUTO and Ettus USRP X310 - UBX160. The results, corresponding to the capture of GPS signals in the L1 band, show the impact of the platform’s performances in the satellite acquisition signal process.","PeriodicalId":356067,"journal":{"name":"2022 3rd URSI Atlantic and Asia Pacific Radio Science Meeting (AT-AP-RASC)","volume":"9 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":"126544046","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-RASC54737.2022.9814164
T. Bonnafont, D. Bessières, J. Paillol
We present a finite volumes method to model and simulate the exposition of a biological cell to a nanosecond electric pulse in the view of electropermeabilization description. A quasi-static electric model based on the metal-dielectric equivalence is proposed for conduction modelling. A Poisson equation is solved. The method - Discrete Dual Finite Volume method (DDFV) - is shown to be efficient in taking electric jump conditions at the cell membrane. The advantages of the method are presented on axisymmetric 2D classic problems.
{"title":"Finite volumes method for the cell electrical model","authors":"T. Bonnafont, D. Bessières, J. Paillol","doi":"10.23919/AT-AP-RASC54737.2022.9814164","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814164","url":null,"abstract":"We present a finite volumes method to model and simulate the exposition of a biological cell to a nanosecond electric pulse in the view of electropermeabilization description. A quasi-static electric model based on the metal-dielectric equivalence is proposed for conduction modelling. A Poisson equation is solved. The method - Discrete Dual Finite Volume method (DDFV) - is shown to be efficient in taking electric jump conditions at the cell membrane. The advantages of the method are presented on axisymmetric 2D classic problems.","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":"124270043","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-RASC54737.2022.9814192
V. Pierrard, E. Botek, J. Ripoll, G. Reeves, S. Thaller
The electron fluxes in the outer radiation belt during and after geomagnetic storms were investigated using the EPT (Energetic Particle Telescope) instrument on board the ESA PROBA-V satellite at a polar LEO (Low Earth Orbit) at 820 km of altitude and compared with simultaneous observations of the instrument MagEIS on board the NASA Van Allen Probes circulating on a low inclination elliptical orbit ranging from 600 to 30 600 km.We find that the equatorial trapped electron fluxes observed at MEO (Medium Earth Orbit) are higher than at LEO. Below 1 MeV, maximal fluxes differ by ~2 orders of magnitude. However, the EPT ultra-relativistic flux (>2.4 MeV) is much lower than the Van Allen Probes flux at 2.33 MeV, by 4 to 5 orders of magnitude. We also observe that the outer belt is quite isotropic during quiet times, contrary to the inner belt. During storms (here, the big storm of 23 June 2015), the dropout and flux increase observed at LEO and MEO present very similar shapes.
{"title":"Observations of Electron Fluxes in the Radiation Belts with PROBA-V/EPT at Polar Low Earth Orbit and Van Allen Probes/MagEIS at Near Equatorial Elliptical Orbit","authors":"V. Pierrard, E. Botek, J. Ripoll, G. Reeves, S. Thaller","doi":"10.23919/AT-AP-RASC54737.2022.9814192","DOIUrl":"https://doi.org/10.23919/AT-AP-RASC54737.2022.9814192","url":null,"abstract":"The electron fluxes in the outer radiation belt during and after geomagnetic storms were investigated using the EPT (Energetic Particle Telescope) instrument on board the ESA PROBA-V satellite at a polar LEO (Low Earth Orbit) at 820 km of altitude and compared with simultaneous observations of the instrument MagEIS on board the NASA Van Allen Probes circulating on a low inclination elliptical orbit ranging from 600 to 30 600 km.We find that the equatorial trapped electron fluxes observed at MEO (Medium Earth Orbit) are higher than at LEO. Below 1 MeV, maximal fluxes differ by ~2 orders of magnitude. However, the EPT ultra-relativistic flux (>2.4 MeV) is much lower than the Van Allen Probes flux at 2.33 MeV, by 4 to 5 orders of magnitude. We also observe that the outer belt is quite isotropic during quiet times, contrary to the inner belt. During storms (here, the big storm of 23 June 2015), the dropout and flux increase observed at LEO and MEO present very similar shapes.","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":"126470535","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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