2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)最新文献

{"title":"Detection and Microwave Imaging of Conducting Objects Buried Very Closely to the Air-Soil Boundary","authors":"Selman Dinç, H. Elibol, Rutkay Güneri, Ali Bahadır Özdöl, Furkan Şık, İsmail Taylan Yeşilyurt, M. Dogan, G. Turhan‐Sayan","doi":"10.1109/ICEAA.2019.8879078","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879078","url":null,"abstract":"Down-looking Ground Penetrating Radar (GPR) is an ultra-wideband electromagnetic sensor which has important applications such as IED and landmine detection, locating people in earthquake rescue operations, detection of archeological sites, mapping ice thickness or quantification of sedimentary structures in geophysical applications. The very first and important step in target detection by GPR is the removal of ground reflections caused by the air-soil boundary as these undesired signals are usually much stronger than the signals reflected and scattered from the buried targets. Ground reflections are well-known for their deteriorating effects on detection rate and false alarm rate in GPR applications. When a target is buried in a reasonable depth such as five centimeters or more, the ground reflections and the first returns from the buried object can be well separated in time, thus the removal of ground reflections turns out to be a standard procedure. However, if the burial depth is very small, the early returns from the target may be mistakenly removed together with the ground reflections. In such a case, a shallowly buried conducting target may go completely unnoticed. In this study, we will investigate the problem of detection and imaging of various conducting targets which are buried only one centimeter below the air-soil interface. The test targets are chosen to be a water-filled rectangular prism made of plastic; a thin rectangular prism coated by aluminum foil; two metal rods of the same length one with circular cross-section and the other one with a square shaped cross-section. After GPR-based measurements are recorded for these targets, a preprocessing method based on energy features and background removal will be used to eliminate air-ground reflections from the raw GPR A-Scan signals. C-Scan data sets, which are the collections of measured A-Scan signals recorded in cross-track and down-track directions, will be used for subsurface microwave imaging to sense the presence of the buried targets, and to figure out their shapes, if possible.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127899012","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}

{"title":"Retrieval of Subsurface Soil Moisture Profiles from L-Band and P-Band Reflectometry","authors":"Amir Azemati, A. Etminan, Alireza Tabatabaeenejad, M. Moghaddam","doi":"10.1109/iceaa.2019.8879216","DOIUrl":"https://doi.org/10.1109/iceaa.2019.8879216","url":null,"abstract":"The use of signals-of-opportunity (SoOp) is becoming one of the mainstream methods for retrieving geophysical properties for environmental studies and operational applications. The pervasive nature of SoOp transmitters and that the rest of the observational hardware system consists principally of a receiver, make this measurement approach quite attractive from the perspective of cost and practicality. Examples of SoOp transmitters include the global navigation satellite system (GNSS) at L-band and the Mobile User Objective System (MUOS) at P-band. NASA has recently invested in an Earth Venture Mission for the use of GNSS reflectometry (the CYGNSS small-sat constellation mission) and MUOS reflectometry (SNOoPI cubesat mission) for various Earth science applications. Although the reflectometry observational systems have several attractive features and have been shown to produce reliable and successful observations in the form of delay-Doppler maps (DDMs), retrieval of land-based variables, such as surface and subsurface profile soil moisture from these maps is still a subject of much ongoing research. There are a number of challenges in the retrieval of soil moisture, including absolute calibration, resolving spatial ambiguities of scattering and reflection points, discerning coherent vs. incoherent contributions, representative and accurate forward scattering models, and accurate inverse scattering algorithms. In this paper, we tackle several of these challenges, and propose a retrieval algorithm for surface-to-root-zone profiles of soil moisture (RZSM). The algorithm uses reflectometry signals at L-band, P-band, and their combinations to obtain accurate estimates of RZSM. First, we use an RZSM profile scattering model that contains both coherent and incoherent scattering contributions. There are multiple options to solve this problem, and our group has previously developed both numerical and approximate analytical methods for this purpose [1]–[3]. Second, we make a correspondence between polarimetric scattering cross sections, reflectivities, and circularly polarized DDM observations so that the model predictions can be related to reflectometry data [4]. The next step is to solve the inverse problem for surface soil moisture and RZSM using single frequencies (L- and P-band) and their combinations if available within a reasonable observation time window. To accomplish the latter task, we use a powerful inversion method recently developed in our group [5], which is a hybrid of global and local optimization methods. We perform a thorough sensitivity analysis to investigate the utility of either frequency alone and in combination for inverting soil moisture at surface and at the root zone. We then show the application of this method to actual SoOp data to the extent available. Recommendations are made for the combined use of GNSS and MUOS for retrieving RZSM. The work reported here focuses on bare surfaces. Vegetated landscapes can be treated similar","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"67 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124351789","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}

{"title":"5G RBS And UE Modelling For Assessment of RF EMF exposure","authors":"A. Piroddi, M. Torregiani","doi":"10.1109/ICEAA.2019.8879101","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879101","url":null,"abstract":"In this paper a model for assessment of radio frequency (RF) electromagnetic fields (EMF) exposure in terms of power density is presented, concerning both 5G Radio Base Stations and 5G User Equipment.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114417596","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}

{"title":"Experimental results for a metamaterial Lüneburg lens","authors":"Débora Costanti Justino Ribeiro, F. Beltrán-Mejía, J. Ribeiro","doi":"10.1109/ICEAA.2019.8878952","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8878952","url":null,"abstract":"This paper presents experimental results obtained from the characterization of a mematerial Lüneburg lens. Previously, a finite element numerical analysis was done in order to determine the compromise between the constitutive and the geometrical parameters. It was shown that is possible to control the effective refractive index of a single cell by only changing the resonator height, where the highest amount of current passes through. Next, the resonators were placed following the needed refractive index distribution for a Lüneburg lens. The dielectric substrate used was 1.6 mm thick and the metamaterial was printed inside a 100mm diameter circle. The antenna excitation was through a vertical monopole adjusted to sent the input impedance to $50 Omega$ at 10 GHz. Transmission measurements were done in a semi-anechoic chamber under different excitation conditions. It was obtained a rise of 20 dB over the measured signal relative to the input one coming from the monopole antenna. The radiated field was linearly polarized and a cross polarization rejection of 18.5 dB was also verified.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114818809","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}

{"title":"Investigation of Radiofrequency Ion Heating in the magnetoplasma of an ECR ion trap","authors":"G. Torrisi, D. Mascali, A. Galatà, L. Celona, G. Mauro, E. Naselli, G. Sorbello, S. Gammino","doi":"10.1109/ICEAA.2019.8879288","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879288","url":null,"abstract":"The Electron Cyclotron Resonance Ion Sources (ECRIS) are nowadays the most effective devices to provide relatively intense currents for highly charged ions devoted to particle accelerators for nuclear science and applications. In ECRIS, the main mechanism of microwave-to-electrons energy transfer is the Electron Cyclotron Resonance heating, when electrons gyrofrequency $boldsymbol{f}_{boldsymbol{ce}}=boldsymbol{eB}/(2boldsymbol{pi} boldsymbol{m}_{boldsymbol{e}})$ equals the frequency $boldsymbol{f}_{boldsymbol{mu} boldsymbol{wave}}$ of the injected microwaves. In ECR plasmas, because of the low electron-ion collision cross-section, the ions remain cold (few eV or less). A direct mastering of the ion temperature through Ion Cyclotron Resonance Heating (ICRH) could be relevant both for improving the performances of the ECRIS as well as for fundamental Physics. In this latter case, the aim is to investigate nuclear decays as a function of the ionization state or the ion temperature. In this paper, the modeling of Radio Frequency (RF) wave-plasma interactions in the ICRH range is investigated for the first time in a compact ECR, B-minimum plasma trap. RF field computation - based on a 3D full-wave FEM-based code - is able to predict wave propagation and power absorption in a non-uniform “cold” anisotropic plasma bounded by a metallic resonator and immersed in a magnetic configuration typical of ECR ion sources. Moreover, some technological aspects and a conceptual design of the RF antenna and related systems delivering multi-kilowatts of power to the plasma ion component are discussed.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114542360","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}

{"title":"Optimization-based Analysis of Inverse Problems of Designing Magnetic Cloaking and Shielding Devices","authors":"G. Alekseev, Y. Spivak, A. Lobanov, I. V. Vinogradov","doi":"10.1109/ICEAA.2019.8879234","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879234","url":null,"abstract":"The inverse problems of magnetostatics arising when designing multilayer two-dimensional shielding or cloaking shells and other functional devices used to control magnetic fields are studied. It is assumed that such shells consist of a finite number of layers, each of which is filled with a homogeneous isotropic medium. Using the optimization method, the inverse problems are reduced to control problems. A numerical algorithm for solving these control problems based on the particle swarm optimization method is proposed, and the results of computational experiments are discussed.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114709038","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}

{"title":"Overview of Wideband Fabry-Pérot Cavity Antennas with Thick Partially Reflective Surface","authors":"Ahmad T. Almutawa, F. Capolino, D. Jackson","doi":"10.1109/ICEAA.2019.8879285","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879285","url":null,"abstract":"Radiation characteristics of wideband Fabry-Perot cavity (FPC) antennas formed by a cavity covered by thick partially reflective surfaces (PRSs) are shown analytically and verified numerically. Thick PRSs are designed and optimized to exhibit a reflection phase with positive slope with a non-Foster-like response in the antenna operational bandwidth. By satisfying the antenna resonance condition over a wide frequency band, a wide radiated-power bandwidth is obtained. A more general and direct relation between the thick-PRS's reflection coefficient and the radially propagating leaky-wave inside the cavity structure is reported. In addition, a leaky-wave based power intensity formula is studied and verified numerically using PRSs formed by stacks of metal-dielectric layers.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"131 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115094911","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}

{"title":"Electrical Properties Mapping via Segmented and Phaseless Contrast Source Inversion","authors":"M. Bevacqua, G. Bellizzi, L. Crocco, T. Isernia","doi":"10.1109/ICEAA.2019.8879210","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879210","url":null,"abstract":"In-vivo estimation of electrical properties of biological tissues is relevant in several medical applications, ranging from hyperthermia treatment planning to dosimetry. In this contribution, we propose a novel inverse scattering approach addressing this problem. In particular, the approach is based on inverting phaseless $boldsymbol{B}_{1}^{+}$ measurements acquired in a magnetic resonance scanner. Moreover, it takes advantage of an innovative use of the segmented anatomy model derived by magnetic resonance images in order to regularize the inverse scattering problem.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117317617","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}

{"title":"How to split electric and toroidal dipole excitations due to superconductivity?","authors":"A. Basharin","doi":"10.1109/ICEAA.2019.8879141","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879141","url":null,"abstract":"This electronic document is a “live” template and already defines the components of your paper [title, text, heads, etc.] in its style sheet. *CRITICAL: Do Not Use Symbols, Special Characters, Footnotes, or Math in Paper Title or Abstract.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"86 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117347409","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}

{"title":"Computation of MBF Reaction Matrices for Antenna Array Analysis, with a Directional Method","authors":"K. Sewraj, M. Botha","doi":"10.1109/ICEAA.2019.8879333","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879333","url":null,"abstract":"Computing the reduced matrix reaction terms in macro basis function (MBF) solvers for large antenna array analysis, is computationally expensive. A hierarchical structure together with a fast low-rank factorization technique can be used in order to improve the computational complexity. However, the rank is expected to increase with the subdomain size for electrically large problems, hence degrading the performance of the algorithm. Directional methods are used to ensure a constant rank for oscillatory kernel applications by subdividing the interacting region into pyramids. This paper report on preliminary investigations for using the directional cross approximation method to compute reaction terms.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123624845","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}