Pub Date : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552346
A. Voronovich, P. E. Johnston, R. Lataitis
Classical integral or integro-differential equations of the Pocklington and Hallen type, describing radiation and scattering of electromagnetic fields by thin, ideally conducting wires, are of significant practical interest and have been extensively studied. These equations follow from the boundary condition that requires a vanishing of the tangential component of the total electric field at the wire surface. The total electric field consists of both a known incident field and a scattered field that is due to a generally unknown current induced in the wire. The scattered electric field for a given point on the wire surface consists both of a “far” field at distant points significantly exceeding the wire's radius $a$, and by a “near” field due to arbitrarily nearby points. Expressions for the “near” field include a logarithmic singularity in the kernel of the associated Pocklington equation. This singularity is an important feature that makes the Pocklington equation solvable and well-posed. Thus, the Pocklington equation in its standard form can be considered as a Fredholm integral equation of the first kind with a singular kernel.
{"title":"On a modified form of Pocklington equation for thin, bent wires","authors":"A. Voronovich, P. E. Johnston, R. Lataitis","doi":"10.23919/USNC-URSIRSM52661.2021.9552346","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552346","url":null,"abstract":"Classical integral or integro-differential equations of the Pocklington and Hallen type, describing radiation and scattering of electromagnetic fields by thin, ideally conducting wires, are of significant practical interest and have been extensively studied. These equations follow from the boundary condition that requires a vanishing of the tangential component of the total electric field at the wire surface. The total electric field consists of both a known incident field and a scattered field that is due to a generally unknown current induced in the wire. The scattered electric field for a given point on the wire surface consists both of a “far” field at distant points significantly exceeding the wire's radius $a$, and by a “near” field due to arbitrarily nearby points. Expressions for the “near” field include a logarithmic singularity in the kernel of the associated Pocklington equation. This singularity is an important feature that makes the Pocklington equation solvable and well-posed. Thus, the Pocklington equation in its standard form can be considered as a Fredholm integral equation of the first kind with a singular kernel.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127835085","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552345
L. Morais, L. Menezes, P. Moraes
This paper proposes a case study for estimating rain attenuation with rainfall data collected in Brasilia, Brazil at THz frequencies using Mie Theory and Drop Size Distribution. To address this goal, we used measured rainfall rate data for the past 18 years collected at the National Institute of Meteorology (INMET). A statistical approach that uses Monte Carlo simulation was applied to obtain a reasonable estimation of rainfall attenuation in the terahertz spectrum. To evaluate the accuracy of the method, we performed a comparison between the rain attenuation calculated by Mie Theory and ITU-R model. The estimation proposed in this work showed that the mean attenuation varies between 1.7 to 3.5 dB/km. For rain events higher than 10 mm/h, results showed that the mean attenuation varies between 8 to 18 dB/km.
{"title":"Rain Attenuation at THz Frequencies from Historical Data Collected in Brasilia, Brazil","authors":"L. Morais, L. Menezes, P. Moraes","doi":"10.23919/USNC-URSIRSM52661.2021.9552345","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552345","url":null,"abstract":"This paper proposes a case study for estimating rain attenuation with rainfall data collected in Brasilia, Brazil at THz frequencies using Mie Theory and Drop Size Distribution. To address this goal, we used measured rainfall rate data for the past 18 years collected at the National Institute of Meteorology (INMET). A statistical approach that uses Monte Carlo simulation was applied to obtain a reasonable estimation of rainfall attenuation in the terahertz spectrum. To evaluate the accuracy of the method, we performed a comparison between the rain attenuation calculated by Mie Theory and ITU-R model. The estimation proposed in this work showed that the mean attenuation varies between 1.7 to 3.5 dB/km. For rain events higher than 10 mm/h, results showed that the mean attenuation varies between 8 to 18 dB/km.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128059987","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552341
A. Drozdov, H. Allison, Y. Shprits, M. Usanova, A. Saikin
The Earth's radiation belts include electrons over a wide energy range. The dynamics of electrons can differ significantly, depending on the energy. In comparison to ~MeV energies, multi-MeV electrons are less predictable during geomagnetic storms [1], as their population can be depleted, enhanced, or remain unchanged, with nearly equal probability [2]. The depletion of electrons can be reversible (adiabatic) or irreversible, due to wave-particle interactions and loss at the outer boundary. Nonadiabatic changes can be identified by analyzing phase space density (PSD) as a function of the three adiabatic invariants. Fast-localized losses, such as interaction with electromagnetic ion cyclotron (EMIC) waves, can produce deepening PSD minima [3]. The EMIC waves are very effective in scattering multi-MeV electrons and can create sharp gradients in pitch angle distributions, although they do not resonate with nearly equatorial mirroring electrons. The depletion of electrons in a wide range of pitch angles occurs with assistance of the hiss and chorus waves [4]. However, the local minimum in PSD may be also observed due to outward radial diffusion with either subsequent refilling of the radiation belts or local acceleration. In this case, the formation of the minima will not result in continued deepening [5].
{"title":"Minima in phase space density and how they relate to the multi-MeV electron radiation belt depletions","authors":"A. Drozdov, H. Allison, Y. Shprits, M. Usanova, A. Saikin","doi":"10.23919/USNC-URSIRSM52661.2021.9552341","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552341","url":null,"abstract":"The Earth's radiation belts include electrons over a wide energy range. The dynamics of electrons can differ significantly, depending on the energy. In comparison to ~MeV energies, multi-MeV electrons are less predictable during geomagnetic storms [1], as their population can be depleted, enhanced, or remain unchanged, with nearly equal probability [2]. The depletion of electrons can be reversible (adiabatic) or irreversible, due to wave-particle interactions and loss at the outer boundary. Nonadiabatic changes can be identified by analyzing phase space density (PSD) as a function of the three adiabatic invariants. Fast-localized losses, such as interaction with electromagnetic ion cyclotron (EMIC) waves, can produce deepening PSD minima [3]. The EMIC waves are very effective in scattering multi-MeV electrons and can create sharp gradients in pitch angle distributions, although they do not resonate with nearly equatorial mirroring electrons. The depletion of electrons in a wide range of pitch angles occurs with assistance of the hiss and chorus waves [4]. However, the local minimum in PSD may be also observed due to outward radial diffusion with either subsequent refilling of the radiation belts or local acceleration. In this case, the formation of the minima will not result in continued deepening [5].","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132239886","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552348
G. Reeves
Active experiments in space provide the opportunity to perturb the natural environment with known and controllable conditions. As such, active experiments are well-suited to studying wave-particle and wave-wave interactions. Active experiments were much more common in the 1970's and 1980's than they are today. Results from rockets, the Space Shuttle, and satellites provided important contributions to our understanding of both linear and non-linear plasma physics. New technologies provide new opportunities for using electron beams to probe the physics of the magnetosphere and, in particular, the radiation belts. In particular, newly-developed RF linear accelerator (linac) technologies can finally be adapted for space enabling much more powerful and flexible options for electron beam wave generation. Similarly, wave receivers, particle detectors, digital electronics, and high telemetry rates now allow detailed measurements of the artificially-generated waves and their effects on the local plasma environment. Specifically, full waveform capture of the 3D electric and magnetic fields allow detailed understanding of the properties of the waves including spectra, wave normal distributions, polarization, etc.
{"title":"Wave Generation and Wave-Particle Interaction Using Space-Based, RF, Linear Electron Accelerators","authors":"G. Reeves","doi":"10.23919/USNC-URSIRSM52661.2021.9552348","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552348","url":null,"abstract":"Active experiments in space provide the opportunity to perturb the natural environment with known and controllable conditions. As such, active experiments are well-suited to studying wave-particle and wave-wave interactions. Active experiments were much more common in the 1970's and 1980's than they are today. Results from rockets, the Space Shuttle, and satellites provided important contributions to our understanding of both linear and non-linear plasma physics. New technologies provide new opportunities for using electron beams to probe the physics of the magnetosphere and, in particular, the radiation belts. In particular, newly-developed RF linear accelerator (linac) technologies can finally be adapted for space enabling much more powerful and flexible options for electron beam wave generation. Similarly, wave receivers, particle detectors, digital electronics, and high telemetry rates now allow detailed measurements of the artificially-generated waves and their effects on the local plasma environment. Specifically, full waveform capture of the 3D electric and magnetic fields allow detailed understanding of the properties of the waves including spectra, wave normal distributions, polarization, etc.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"221 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134333474","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552372
J. Holmes, G. Delzanno, C. Jeffery, P. Colestock
Whistler mode waves in the Earth's inner magnetosphere playa key role in local energy transfer between particle populations and in larger scale processes such as scattering of trapped energetic electrons into the atmospheric loss cone. A body of recent research has focused on active experiments which generate whistler waves (e.g. via an antenna or accelerating an unstable electron beam) with the intent of influencing these processes. Accurately modeling how whistlers evolve on a global scale is an important step toward evaluating the impacts of these experimental efforts.
{"title":"Using Ray Tracing to Model the Plasmaspheric Wave Field for Active Experiments in Space","authors":"J. Holmes, G. Delzanno, C. Jeffery, P. Colestock","doi":"10.23919/USNC-URSIRSM52661.2021.9552372","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552372","url":null,"abstract":"Whistler mode waves in the Earth's inner magnetosphere playa key role in local energy transfer between particle populations and in larger scale processes such as scattering of trapped energetic electrons into the atmospheric loss cone. A body of recent research has focused on active experiments which generate whistler waves (e.g. via an antenna or accelerating an unstable electron beam) with the intent of influencing these processes. Accurately modeling how whistlers evolve on a global scale is an important step toward evaluating the impacts of these experimental efforts.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"144 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115572242","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552351
R. Marshall, R. Reid, M. Usanova, M. Starks, G. Wilson
The Very-Low-Frequency Propagation Mapper (VPM) CubeSat was designed to observe VLF waves from Low-Earth Orbit. In particular, VPM uses a single-axis electric field antenna and a single magnetic search coil to measure VLF waves from 300 Hz to 40 kHz. Among the mission objectives, VPM was designed to detect and measure artificial VLF signals transmitted from the Demonstration and Science Experiments (DSX) mission in Medium-Earth Orbit. The VPM CubeSat was launched and commissioned in February 2020; it successfully collected electric field data for six months before communication with the spacecraft was lost.
{"title":"First observations and results from the Very-Low-Frequency Propagation Mapper (VPM) CubeSat mission","authors":"R. Marshall, R. Reid, M. Usanova, M. Starks, G. Wilson","doi":"10.23919/USNC-URSIRSM52661.2021.9552351","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552351","url":null,"abstract":"The Very-Low-Frequency Propagation Mapper (VPM) CubeSat was designed to observe VLF waves from Low-Earth Orbit. In particular, VPM uses a single-axis electric field antenna and a single magnetic search coil to measure VLF waves from 300 Hz to 40 kHz. Among the mission objectives, VPM was designed to detect and measure artificial VLF signals transmitted from the Demonstration and Science Experiments (DSX) mission in Medium-Earth Orbit. The VPM CubeSat was launched and commissioned in February 2020; it successfully collected electric field data for six months before communication with the spacecraft was lost.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126601667","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552338
A. Akhiyat, Pawan Gaire, J. Volakis
Advances in Electro-Optics (EO) in terms of materials and micro-and-nanofabrication processes have provided new capabilities for EO sensing devices. These new capabilities include increased sensitivity, tolerance to electromagnetic interference, and higher bandwidth performance. One such widely used device is the electro-optic modulator (EOM). EOM makes use of an incident RF signal to modulate an optical carrier. In a functional EOM, the modulation take place within the active optical area of the nonlinear EO device material. These nonlinear EO materials have an electro-optic effect properties. Examples of these materials are nonlinear polymers and lithium niobate (LN).
{"title":"Millimeter Wave Antenna Design for On-Chip Electro-Optical Sensing Devices Using Optical Up-Conversion","authors":"A. Akhiyat, Pawan Gaire, J. Volakis","doi":"10.23919/USNC-URSIRSM52661.2021.9552338","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552338","url":null,"abstract":"Advances in Electro-Optics (EO) in terms of materials and micro-and-nanofabrication processes have provided new capabilities for EO sensing devices. These new capabilities include increased sensitivity, tolerance to electromagnetic interference, and higher bandwidth performance. One such widely used device is the electro-optic modulator (EOM). EOM makes use of an incident RF signal to modulate an optical carrier. In a functional EOM, the modulation take place within the active optical area of the nonlinear EO device material. These nonlinear EO materials have an electro-optic effect properties. Examples of these materials are nonlinear polymers and lithium niobate (LN).","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126257314","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552366
Hiroki Ichiba, Yuji Ito, Toshihiko Hamasaki
In this paper, a low-power wide-area wireless system is used to obtain an appropriate model for sub-GHz-band radio propagation diffraction loss in a multi-island area to compare with actual measurements. For the radio propagation in the multi-island sea discussed in this paper, the contour of the obstacle is clear because the obstacle island is surrounded by a horizontal sea surface. As a result, the Bullington method, which assumes a virtual peak at the intersection of the two ends of the obstacle, is found to be suitable. The results also show that the multi-island sea area has an advantage in improving the accuracy of modeling because the criteria for determining isolated obstacles are easy to determine.
{"title":"Analysis of a Sub-GHz-Band Diffraction Propagation Model for Maritime Application","authors":"Hiroki Ichiba, Yuji Ito, Toshihiko Hamasaki","doi":"10.23919/USNC-URSIRSM52661.2021.9552366","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552366","url":null,"abstract":"In this paper, a low-power wide-area wireless system is used to obtain an appropriate model for sub-GHz-band radio propagation diffraction loss in a multi-island area to compare with actual measurements. For the radio propagation in the multi-island sea discussed in this paper, the contour of the obstacle is clear because the obstacle island is surrounded by a horizontal sea surface. As a result, the Bullington method, which assumes a virtual peak at the intersection of the two ends of the obstacle, is found to be suitable. The results also show that the multi-island sea area has an advantage in improving the accuracy of modeling because the criteria for determining isolated obstacles are easy to determine.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130338369","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552358
Mohammad M. Al-Khaldi, J. Johnson, S. Katzberg, Young-Heac Kang, E. Kubatko, S. Gleason
This presentation reports on progress relating to a storm characterization approach using spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) measurements from the Cyclone Global Navigation Satellite System (CYGNSS) mission. The retrieval concept is based on the use of a forward model for CYGNSS returns, which can produce predicted waveforms for parametric storm models having varying storm features, with particular emphasis placed on the storm maximum wind speed. A “matched filter” approach is then adopted by correlating predicted returns with those observed throughout an entire CYGNSS overpass of a storm; the correlation is performed between predicted and measured DDMs normalized by their root-mean-square (RMS) amplitudes. Storm parameters producing the maximum correlation and minimum RMS error (RMSE) values are then designated the retrieved value from which a complete parametric wind field for storm surge simulation can be generated. It is noted that the utility of this formulation is not limited to tracks passing through the storm eye, making “near-miss” tracks equally usable for attempting to retrieve storm information.
{"title":"Progress and Error Dependencies of Matched Filter Maximum Cyclone Wind Retrievals Using CYGNSS","authors":"Mohammad M. Al-Khaldi, J. Johnson, S. Katzberg, Young-Heac Kang, E. Kubatko, S. Gleason","doi":"10.23919/USNC-URSIRSM52661.2021.9552358","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552358","url":null,"abstract":"This presentation reports on progress relating to a storm characterization approach using spaceborne Global Navigation Satellite System Reflectometry (GNSS-R) measurements from the Cyclone Global Navigation Satellite System (CYGNSS) mission. The retrieval concept is based on the use of a forward model for CYGNSS returns, which can produce predicted waveforms for parametric storm models having varying storm features, with particular emphasis placed on the storm maximum wind speed. A “matched filter” approach is then adopted by correlating predicted returns with those observed throughout an entire CYGNSS overpass of a storm; the correlation is performed between predicted and measured DDMs normalized by their root-mean-square (RMS) amplitudes. Storm parameters producing the maximum correlation and minimum RMS error (RMSE) values are then designated the retrieved value from which a complete parametric wind field for storm surge simulation can be generated. It is noted that the utility of this formulation is not limited to tracks passing through the storm eye, making “near-miss” tracks equally usable for attempting to retrieve storm information.","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128929879","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 : 2021-08-09DOI: 10.23919/USNC-URSIRSM52661.2021.9552357
P. Uslenghi
The two-dimensional boundary-value problem of scattering by structures containing sharp edges allows for an exact geometrical optics (GO) solution only in particular cases, which usually involve restrictions on one or more of the following parameters: the number of plane incident waves; their polarization, phase and direction of incidence; the relationships between wavelength and dimensions of the scattering object; the electromagnetic properties of the scattering materials. An exact GO solution under incidence by a single plane wave is not known and presumably is not possible for wedge structures made of perfect electric or perfect magnetic materials [1], [2]. For penetrable wedges, the only known exact GO solution for a single wedge under incidence by a single plane wave is the scattering by a right-angle wedge made of anti-isorefractive DNG metamaterial [3]. The result obtained in [3] has been applied to obtain the exact GO scattering of two plane waves propagating in opposite directions by a DNG prism of rectangular cross section [4].
{"title":"Invisibility of Triangular Anti-Isorefractive DNG Prisms Illuminated by Multiple Incident Plane Waves","authors":"P. Uslenghi","doi":"10.23919/USNC-URSIRSM52661.2021.9552357","DOIUrl":"https://doi.org/10.23919/USNC-URSIRSM52661.2021.9552357","url":null,"abstract":"The two-dimensional boundary-value problem of scattering by structures containing sharp edges allows for an exact geometrical optics (GO) solution only in particular cases, which usually involve restrictions on one or more of the following parameters: the number of plane incident waves; their polarization, phase and direction of incidence; the relationships between wavelength and dimensions of the scattering object; the electromagnetic properties of the scattering materials. An exact GO solution under incidence by a single plane wave is not known and presumably is not possible for wedge structures made of perfect electric or perfect magnetic materials [1], [2]. For penetrable wedges, the only known exact GO solution for a single wedge under incidence by a single plane wave is the scattering by a right-angle wedge made of anti-isorefractive DNG metamaterial [3]. The result obtained in [3] has been applied to obtain the exact GO scattering of two plane waves propagating in opposite directions by a DNG prism of rectangular cross section [4].","PeriodicalId":365284,"journal":{"name":"2021 USNC-URSI Radio Science Meeting (USCN-URSI RSM)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127428072","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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