Pub Date : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221488
X. Sun, R. Wen, J. W. Lu, S. X. Sun, Z. He, D. Ding
Blind source separation (BSS) is an effective method to deal with the aliasing echo received by radar in the field of target detection. Single-channel BSS is a morbid problem of multi-channel BSS, but it has higher research value since it is more in line with practical application scenarios. Therefore, a single-channel BSS problem for adjacent group targets is studied in this paper. The coupling signals will be generated between targets when the distance between group targets is less than 10 times wavelength. It is difficult to accurately separate the source echoes of each target from the mixed echoes because the coupling echoes will have a certain influence on the mixed echoes of group targets. A new BSS method based on density clustering algorithm is proposed in this paper in order to solve this problem. Firstly, the strong scattering center points of group targets are obtained by radar imaging. Then, the strong scattering center points are clustered by the density-based clustering algorithm (DBCA). Next, the coupling echo is determined according to the variation of amplitude with azimuth, and the coupling signal is removed by the position information of the cluster. Finally, the mixed echo is separated, and the different separation methods are selected according to the spectrum of the mixed echo. 2-D imaging inverse operation is adopted if there is a single spectral peak; the empirical mode decomposition-fast independent component analysis (EMD-FastICA) algorithm is adopted if there are multiple spectral peaks. The simulation results show that this method can effectively separate the source signal from the echo containing coupling information within the error range.
{"title":"Blind Source Separation of Adjacent Group Targets Based on Coupling Scattering Center Removal","authors":"X. Sun, R. Wen, J. W. Lu, S. X. Sun, Z. He, D. Ding","doi":"10.1109/PIERS59004.2023.10221488","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221488","url":null,"abstract":"Blind source separation (BSS) is an effective method to deal with the aliasing echo received by radar in the field of target detection. Single-channel BSS is a morbid problem of multi-channel BSS, but it has higher research value since it is more in line with practical application scenarios. Therefore, a single-channel BSS problem for adjacent group targets is studied in this paper. The coupling signals will be generated between targets when the distance between group targets is less than 10 times wavelength. It is difficult to accurately separate the source echoes of each target from the mixed echoes because the coupling echoes will have a certain influence on the mixed echoes of group targets. A new BSS method based on density clustering algorithm is proposed in this paper in order to solve this problem. Firstly, the strong scattering center points of group targets are obtained by radar imaging. Then, the strong scattering center points are clustered by the density-based clustering algorithm (DBCA). Next, the coupling echo is determined according to the variation of amplitude with azimuth, and the coupling signal is removed by the position information of the cluster. Finally, the mixed echo is separated, and the different separation methods are selected according to the spectrum of the mixed echo. 2-D imaging inverse operation is adopted if there is a single spectral peak; the empirical mode decomposition-fast independent component analysis (EMD-FastICA) algorithm is adopted if there are multiple spectral peaks. The simulation results show that this method can effectively separate the source signal from the echo containing coupling information within the error range.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"708 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123927002","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10220957
S. Pevec, M. Njegovec, J. Javornik, D. Donlagic
The paper describes a fiber optic Fabry-Perot (FP) refractive index (RI) sensors that provide performances required in gas sensing applications. Presented high-resolution FabryPerot Interferometer (FPI) sensors are based on open-path cells that can be integrated with the optical fiber in different ways. They can be fabricated as microcells on the fiber tip or along the optical fiber, or as external/extrinsic gas cells connected to the fiber. All presented configurations are based on low-finesse FPI as they allow for a simple and cost-efficient designs.
{"title":"Fiber Optic Devices for High-Resolution Refractive Index Sensing","authors":"S. Pevec, M. Njegovec, J. Javornik, D. Donlagic","doi":"10.1109/PIERS59004.2023.10220957","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10220957","url":null,"abstract":"The paper describes a fiber optic Fabry-Perot (FP) refractive index (RI) sensors that provide performances required in gas sensing applications. Presented high-resolution FabryPerot Interferometer (FPI) sensors are based on open-path cells that can be integrated with the optical fiber in different ways. They can be fabricated as microcells on the fiber tip or along the optical fiber, or as external/extrinsic gas cells connected to the fiber. All presented configurations are based on low-finesse FPI as they allow for a simple and cost-efficient designs.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125777620","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221283
X. Fang, Minghui Chen, Meng Li, Dazhi Ding
A design of angular self-adaptive planar Doppler cloak composed by a pair of space-time modulated metasurfaces is proposed in this paper. The first metasurface focuses the incident field in a specific location on the second metasurface, that is designed for enabling angular reflection and Doppler frequency shift compensation. We make use of ray tracing method based on generalized Snell's law, and introduce an error function for deriving numerically the optimum phase profile of two metasurfaces, leading to keep the radar cross-section of the Doppler cloak as much stable as possible within an angular range of about 60° centered at the normal direction. The self-adaptive Doppler cloak may enhance the undetectability of cloaked moving objects.
{"title":"Angular Self-Adaptive Doppler Cloak Based on Space-Time Modulated Metasurface","authors":"X. Fang, Minghui Chen, Meng Li, Dazhi Ding","doi":"10.1109/PIERS59004.2023.10221283","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221283","url":null,"abstract":"A design of angular self-adaptive planar Doppler cloak composed by a pair of space-time modulated metasurfaces is proposed in this paper. The first metasurface focuses the incident field in a specific location on the second metasurface, that is designed for enabling angular reflection and Doppler frequency shift compensation. We make use of ray tracing method based on generalized Snell's law, and introduce an error function for deriving numerically the optimum phase profile of two metasurfaces, leading to keep the radar cross-section of the Doppler cloak as much stable as possible within an angular range of about 60° centered at the normal direction. The self-adaptive Doppler cloak may enhance the undetectability of cloaked moving objects.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128415976","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221312
C. Larmour, Y. Li, A. Li, N. Buchanan, V. Fusco, D. Zelenchuk, M. A. B Abbasi
In this study, we explore the impact of a two-handed grip on the coverage of a handset featuring three antenna arrays operating in the n257 frequency band of 26.5 GHz-29.5 GHz. We focus on beam steering, which is effectively implemented using the antenna arrays and multibit phase shifters to provide quasi-omnidirectional coverage. We investigate how different hand grips impact the handset's coverage region, including clockwise (CW) and anti-clockwise (ACW) rotation of the handset. Our findings reveal that, for the CW two-handed grip, beam steering significantly increased the coverage region (in which gain is greater than 0 dBi) from 19.7% to 42.2% of the spherical region surrounding the handset when 3-bit phase shifters are used for analogue beam steering. Similarly, for the ACW two-handed grip, coverage was increased from 10.2% to 36.9% with 3-bit beam steering. Cumulative distribution function (CDF) performance for effective isotropic radiated power (EIRP) is also considered for the handset in free space, along with both grip orientations. It is once again shown that beam steering offers a significant performance increase; however, it is also shown that introducing the user's hand grip degrades the performance. Additionally, this paper investigates the impact of varying the phase shifter resolution used to actuate beam steering on the coverage of the handset. We found that increasing the resolution increases the number of possible steering angles at each array, thereby increasing the percentage coverage of the handset. However, we also note that the relationship between resolution and coverage plateaus around 3 bits. Overall, our study highlights the importance of beam steering in improving coverage and signal strength for handsets operating in the n257 frequency band. By exploring the impact of different hand grips and phase shifter resolution, we provide valuable insights into designing future handsets that can better serve users in various settings.
{"title":"Impact of Two-Handed Grip on Quasi-Omnidirectional Coverage of mm Wave 5G Handset","authors":"C. Larmour, Y. Li, A. Li, N. Buchanan, V. Fusco, D. Zelenchuk, M. A. B Abbasi","doi":"10.1109/PIERS59004.2023.10221312","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221312","url":null,"abstract":"In this study, we explore the impact of a two-handed grip on the coverage of a handset featuring three antenna arrays operating in the n257 frequency band of 26.5 GHz-29.5 GHz. We focus on beam steering, which is effectively implemented using the antenna arrays and multibit phase shifters to provide quasi-omnidirectional coverage. We investigate how different hand grips impact the handset's coverage region, including clockwise (CW) and anti-clockwise (ACW) rotation of the handset. Our findings reveal that, for the CW two-handed grip, beam steering significantly increased the coverage region (in which gain is greater than 0 dBi) from 19.7% to 42.2% of the spherical region surrounding the handset when 3-bit phase shifters are used for analogue beam steering. Similarly, for the ACW two-handed grip, coverage was increased from 10.2% to 36.9% with 3-bit beam steering. Cumulative distribution function (CDF) performance for effective isotropic radiated power (EIRP) is also considered for the handset in free space, along with both grip orientations. It is once again shown that beam steering offers a significant performance increase; however, it is also shown that introducing the user's hand grip degrades the performance. Additionally, this paper investigates the impact of varying the phase shifter resolution used to actuate beam steering on the coverage of the handset. We found that increasing the resolution increases the number of possible steering angles at each array, thereby increasing the percentage coverage of the handset. However, we also note that the relationship between resolution and coverage plateaus around 3 bits. Overall, our study highlights the importance of beam steering in improving coverage and signal strength for handsets operating in the n257 frequency band. By exploring the impact of different hand grips and phase shifter resolution, we provide valuable insights into designing future handsets that can better serve users in various settings.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128754763","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221554
A. Girich, S. Nedukh, S. Polevoy, A. Vakula, K. Sova, S. Tarapov
We have numerically investigated the strong photon-magnon coupling in the system of two coupled resonators: planar photonic crystal with the defect and inverted split-ring resonator. The strong photon-magnon coupling $(g/2pi=300 MHz$) with a spin-number-normalized coupling strength (single spin-photon coupling) was reached up to 0.535 Hz at the frequency of 5.1 GHz. The influence of the outer radius of the inverted spit-ring resonator on the coupling strength value is analyzed.
{"title":"Strong Photon-magnon Coupling in a System of Two Coupled Resonators: Planar Photonic Crystal with Defect and Inverted Split-ring Resonator","authors":"A. Girich, S. Nedukh, S. Polevoy, A. Vakula, K. Sova, S. Tarapov","doi":"10.1109/PIERS59004.2023.10221554","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221554","url":null,"abstract":"We have numerically investigated the strong photon-magnon coupling in the system of two coupled resonators: planar photonic crystal with the defect and inverted split-ring resonator. The strong photon-magnon coupling $(g/2pi=300 MHz$) with a spin-number-normalized coupling strength (single spin-photon coupling) was reached up to 0.535 Hz at the frequency of 5.1 GHz. The influence of the outer radius of the inverted spit-ring resonator on the coupling strength value is analyzed.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129996128","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221237
A. Giuri, F. Bisconti, Nicholas Rolston, R. Dauskardt, R. Suhonen, T. Kraft, M. Ylikunnari, V. Holappa, R. Po, P. Biagini, C. E. Corcione, A. Listorti, S. Colella, A. Rizzo
The record performance reached by metal halide perovskite in solar cells in a very short time calls for a real word application, however, several major intrinsic limitations need to be solved before the technological maturation can be reached. The intrinsic instability, the poor control of perovskite materials' properties deposited via wet processing, and the intrinsic mechanical fragility of the polycrystalline films are the among the most relevant issue. Herein, the use of polymeric additive has been investigated as a mean to gaining a control over the processing and improving the perovskite material stability to the environmental factors, eventually to developing perovskite inks compatible with large area solar cells manufacturing. Several polymers were evaluated based on their solubility and compatibility with perovskite precursors solutions. Among all, starch polysaccharide has been selected since it can induce a convenient viscosity modulation that make perovskite precursors' inks with different printing techniques. Importantly, starch can also enhance perovskite materials mechanical strength and tolerance to thermal stress.
{"title":"Additive Engineering: A Route Towards Flexible and Robust Perovskite Solar Cells","authors":"A. Giuri, F. Bisconti, Nicholas Rolston, R. Dauskardt, R. Suhonen, T. Kraft, M. Ylikunnari, V. Holappa, R. Po, P. Biagini, C. E. Corcione, A. Listorti, S. Colella, A. Rizzo","doi":"10.1109/PIERS59004.2023.10221237","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221237","url":null,"abstract":"The record performance reached by metal halide perovskite in solar cells in a very short time calls for a real word application, however, several major intrinsic limitations need to be solved before the technological maturation can be reached. The intrinsic instability, the poor control of perovskite materials' properties deposited via wet processing, and the intrinsic mechanical fragility of the polycrystalline films are the among the most relevant issue. Herein, the use of polymeric additive has been investigated as a mean to gaining a control over the processing and improving the perovskite material stability to the environmental factors, eventually to developing perovskite inks compatible with large area solar cells manufacturing. Several polymers were evaluated based on their solubility and compatibility with perovskite precursors solutions. Among all, starch polysaccharide has been selected since it can induce a convenient viscosity modulation that make perovskite precursors' inks with different printing techniques. Importantly, starch can also enhance perovskite materials mechanical strength and tolerance to thermal stress.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130134761","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221258
Shiyuan Zhang, Chuan Shi, Ou Pan, M. Bai
In our previous research, we proposed a multi-layer perceptron method for synthesizing radiation patterns with complex requirements. However, this method has a limitation in that it requires continuous amplitude and phase excitations. The continuous excitations may not be practical in most applications, and when the amplitude and phase of the antenna element are discontinuous due to the resolution of the electronic device during the optimization process, this method may fail. In order to solve this problem, a combined method is proposed in this paper, utilizing the multi-layer perceptron network to optimize the radiation patterns of array antenna with continuous amplitude and phase, and introducing a deep reinforcement learning method to compensate for the elevated sidelobes in the radiation patterns caused by amplitude and phase discretization in post-processing. Specifically, the continuous amplitude and phase values obtained through the multi-layer perceptron network are rounded to approximate discrete results based on the resolution, serving as prior training experience for the deep reinforcement learning model. The compensation problem of elevated sidelobes caused by amplitude and phase discretization is then formulated as an optimization model, and a deep reinforcement learning model is constructed accordingly, with discrete excitations acting as the agent for exploration and search. The agent is trained using the Deep Q-learning network as the basic framework, combined with Double DQN technology and Dueling DQN technology to efficiently search for the best compensatory effect. The reward is carefully designed to incentivize the agent to search for discrete excitations with the optimal compensatory effect. A simulation experiment is conducted on a 50-element hemispheric conformal antenna array, demonstrating the effectiveness of the combined method.
{"title":"A Compensation for Elevated Sidelobe of Radiation Pattern of Antenna Array Caused by Amplitude and Phase Discretization Based on Deep Reinforcement Learning","authors":"Shiyuan Zhang, Chuan Shi, Ou Pan, M. Bai","doi":"10.1109/PIERS59004.2023.10221258","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221258","url":null,"abstract":"In our previous research, we proposed a multi-layer perceptron method for synthesizing radiation patterns with complex requirements. However, this method has a limitation in that it requires continuous amplitude and phase excitations. The continuous excitations may not be practical in most applications, and when the amplitude and phase of the antenna element are discontinuous due to the resolution of the electronic device during the optimization process, this method may fail. In order to solve this problem, a combined method is proposed in this paper, utilizing the multi-layer perceptron network to optimize the radiation patterns of array antenna with continuous amplitude and phase, and introducing a deep reinforcement learning method to compensate for the elevated sidelobes in the radiation patterns caused by amplitude and phase discretization in post-processing. Specifically, the continuous amplitude and phase values obtained through the multi-layer perceptron network are rounded to approximate discrete results based on the resolution, serving as prior training experience for the deep reinforcement learning model. The compensation problem of elevated sidelobes caused by amplitude and phase discretization is then formulated as an optimization model, and a deep reinforcement learning model is constructed accordingly, with discrete excitations acting as the agent for exploration and search. The agent is trained using the Deep Q-learning network as the basic framework, combined with Double DQN technology and Dueling DQN technology to efficiently search for the best compensatory effect. The reward is carefully designed to incentivize the agent to search for discrete excitations with the optimal compensatory effect. A simulation experiment is conducted on a 50-element hemispheric conformal antenna array, demonstrating the effectiveness of the combined method.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130137638","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221412
Z. Deng, Y. Su, Pengcheng Zhou, X. Wang, R. Gong
The active regulation of the infrared radiation is a focal point in the fields of energy saving, thermal camouflage and optical switching. In this paper, we conduct the research on broadband infrared radiation tunable films with phase change material Ge2Sb2Te5 (GST). By utilizing the property of variable refractive index of GST, we construct the GST/ZnS one-dimensional photonic crystal films with tunable infrared emissivity. The fabricated [GST/ZnS]4 film has a great switchable ability of infrared radiation with the tunable range of the emissivity in 3-5 μm waveband is 0.385. The infrared emissivity of the film is 0.159 when the GST is at crystalline state and 0.544 when the GST is at amorphous state. The broadband infrared radiation tunable film is expected to be extended to applications that rely on infrared radiation control technology, such as energy saving, thermal camouflage, and optical switching.
{"title":"Infrared Spectrum Regulation of One-Dimensional Photonic Crystal Thin Films with Ge2Sb2Te5","authors":"Z. Deng, Y. Su, Pengcheng Zhou, X. Wang, R. Gong","doi":"10.1109/PIERS59004.2023.10221412","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221412","url":null,"abstract":"The active regulation of the infrared radiation is a focal point in the fields of energy saving, thermal camouflage and optical switching. In this paper, we conduct the research on broadband infrared radiation tunable films with phase change material Ge2Sb2Te5 (GST). By utilizing the property of variable refractive index of GST, we construct the GST/ZnS one-dimensional photonic crystal films with tunable infrared emissivity. The fabricated [GST/ZnS]4 film has a great switchable ability of infrared radiation with the tunable range of the emissivity in 3-5 μm waveband is 0.385. The infrared emissivity of the film is 0.159 when the GST is at crystalline state and 0.544 when the GST is at amorphous state. The broadband infrared radiation tunable film is expected to be extended to applications that rely on infrared radiation control technology, such as energy saving, thermal camouflage, and optical switching.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130688125","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221514
G. V. Jaudieri, S. Barnovi, S. Mukhashavria
This paper investigates propagation and multiple scattering of small amplitude radio waves propagating in the polar terrestrial ionosphere. Double-peaked shape of the spatial power spectrum is described by second order statistical moments containing complex refractive index, polarization coefficients, orientation of homogeneous external magnetic field, ionospheric conductivities, anisotropic parameters of electron density inhomogeneities, and the distances between observation points. Features of the “Double-Humped Effect” are considered analytically in absorptive statistically anisotropic magnetoactive plasma. Numerical analyses are carried out for anisotropic Gaussian correlation function applying experimental data for polar ionospheric F-layer. The results have been obtained analytically for the first time and could find practical Application in remote sensing of the terrestrial ionosphere and in communication.
{"title":"Some Peculiarities of the Angular Spectrum of Radio Waves Scattered in the Polar Ionospheric Plasma","authors":"G. V. Jaudieri, S. Barnovi, S. Mukhashavria","doi":"10.1109/PIERS59004.2023.10221514","DOIUrl":"https://doi.org/10.1109/PIERS59004.2023.10221514","url":null,"abstract":"This paper investigates propagation and multiple scattering of small amplitude radio waves propagating in the polar terrestrial ionosphere. Double-peaked shape of the spatial power spectrum is described by second order statistical moments containing complex refractive index, polarization coefficients, orientation of homogeneous external magnetic field, ionospheric conductivities, anisotropic parameters of electron density inhomogeneities, and the distances between observation points. Features of the “Double-Humped Effect” are considered analytically in absorptive statistically anisotropic magnetoactive plasma. Numerical analyses are carried out for anisotropic Gaussian correlation function applying experimental data for polar ionospheric F-layer. The results have been obtained analytically for the first time and could find practical Application in remote sensing of the terrestrial ionosphere and in communication.","PeriodicalId":354610,"journal":{"name":"2023 Photonics & Electromagnetics Research Symposium (PIERS)","volume":"70 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132972416","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 : 2023-07-03DOI: 10.1109/PIERS59004.2023.10221486
Sofia Aversa, Bilal Amin, Nuno P. Silva, M. A. Elahi
Abdominal aortic aneurysm (AAA) is an irreversible balloon-like dilation of the abdominal aorta. Endovascular Aneurysm Repair (EVAR) is the main surgical treatment for AAA, which involves the insertion of a graft inside the aneurysm. This procedure involves certain complications such as graft migration and graft-related endoleaks. To monitor such complications patients are required to undergo regular follow-up imaging surveillance. Studies have proposed monitoring graft functioning by using a chronically implantable device. The device is implanted at the time of the EVAR surgery and avoids the need for radiological imaging surveillance. This study has proposed a 3D-printed AAA latex model and an artificial circulatory system for the AAA models. The proposed 3D model and its artificial circulatory system can be used as a platform for future in vitro testing and optimization of chronically implantable devices for post-EVAR surveillance. The artificial circulatory system can also be used to show the response of the latex model to different haemodynamic conditions. In this study, a 3D Slicer software was used to convert the Computed Tomography (CT) images of real patients into anthropomorphic 3D AAA models. The 3D models were printed to create the mould. The final latex model was created by dipping the mould in liquid latex. The latex model was connected to the artificial circulatory model. To mimic the physiological parameters of the human heart, the pulsatile pump FlowTek125 was connected to the AAA model. To mimic the properties of blood, distilled water was pumped through the AAA model. The study was successful in recreating an anthropomorphic AAA artificial circulatory system. The proposed model can be used for experimental studies, particularly those focused on developing novel implantable devices for post-EVAR stent monitoring.
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