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

{"title":"Accuracy of Thin-wire MoM Formulations for Phased Array Analysis for SKA-LOW","authors":"D. Davidson","doi":"10.1109/ICEAA.2019.8878998","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8878998","url":null,"abstract":"The Square Kilometre Array (SKA) project is an international effort to build the world's largest radio telescope, with eventually over a square kilometre (one million square metres) of collecting area envisaged [1]. SKA-LOW, the low frequency component of the Square Kilometre Array radio telescopes, will be deployed on the Murchison Radio-astronomy Observatory (MRO) in Western Australia. Our Curtin engineering team is currently working on the analysis and simulation of this pioneering system. It will consist of a large array of essentially dipole-like radiators, clustered into “stations” of 256 antennas. The current prototype antenna consists of a dual-polarised log-periodic dipole, with a 7:1 design bandwidth from 50–350 MHz. This is a relatively complex structure to simulate.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"112 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":"121510254","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":"Generalized Automatic Surface Reconstruction for CEM Simulations","authors":"B. Notaroš, J. Harmon, C. Key","doi":"10.1109/ICEAA.2019.8879338","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879338","url":null,"abstract":"We present a robust method for automatic high-quality reconstruction and refinement of surface meshes for application in both traditional and ultra-high-order computational electromagnetics (CEM) tools. The generation of optimal surface meshes, especially for higher-order geometries, demonstrates significant promise to improve the accuracy and efficiency in CEM.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"50 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":"125247393","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":"Variable Pitch Crossed Surface Relief Gratings for Point-of-Care Sensing","authors":"J. Gomez-Cruz, Yazan Bdour, E. Carrasco, R. G. Sabat, C. Escobedo","doi":"10.1109/ICEAA.2019.8879148","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879148","url":null,"abstract":"Nanostructures consisting of crossed surface relief gratings (CSRGs) support surface plasmon resonances (SPRs) that are compatible with biosensing applications [1], [2]. At normal incidence, surface plasmons are excited between a metal and a dielectric at a light wavelength ($lambda_{text{SPR}}$) given by $lambda_{SPR}=nLambda[sqrt{varepsilon_{m}/(n^{2}+varepsilon_{m})}]$, where $n$ is the index of refraction of the dielectric, and $varepsilon_{m}$ is the real part of the permittivity of the metal and $Lambda$ is the grating pitch. When placed between crossed linear polarizers, CSRGs allow for plasmonic energy exchange between the two superimposed gratings that eliminate any incident polychromatic light, except for the narrow SPR bandwidth where polarization conversion occurs. The result is an effective transmission of the SPR signal with a high signal-to-noise ratio. The single pitch of CSRGs, however, limit their operation to a specific plasmonic resonance wavelength. Here, we present a plasmonic sensor based on variable-pitch CSRG that allows plasmonic resonances at different wavelength bandwidth depending on the illuminated region. The variable-pitch CSRGs (VP-CSRGs) are fabricated on azobenzene-functionalized films through a simple two-step procedure. Fig. 1a presents an actual AFM image of the surface of a nanofabricated VP-CSRGs. The plasmonic response of the VP-CSRG sensor was evaluated using Finite-Difference Time-Domain (FDTD) simulations to show the e-field intensity distribution on the gold-coated VP-CSRG surface. Electric field enhancement and distribution, due to the plasmonic conversion, was assessed through the change of the RI of the dielectric medium in contact with the metallic crossed gratings, and through the spectral diversity of the light source to excite the surface plasmons. For the simulations, the surface of the CSRGs with pitches of 520, 540 and 560 nm were modeled using the function, $f(x, y)=G(cos[(2pi/p)x]+cos[(2 pi/p)y])$, where $G$ is the amplitude and $p$ the period of the structure (Fig. 1a). The simulations were used to obtain the e-field intensity distribution, normalized with respect to the incident plane wave. Periodic boundary conditions in both $x$ and $y$ directions and a perfectly matched layer (PML) in the $z$ direction were used for the analysis region. A uniform mesh size of 3 nm was used for the envelope of the nanostructure, comprising the azobenzene layer, the gold film and the dielectric medium, in all the directional axes. A plane wave, polarized along the $y$-axis and orthogonal to the $x-y$ plane, was employed to induce a SPR in the structure. Fig. 1b demonstrates the plasmonic excitation in the $x$-direction, when using p-polarized light and the absence of plasmonic excitation in the $y$-direction. However, when s-polarized light is used, the nanostructures are excited in the $y$-direction. These results present an evidence on the unique plasmonic energy transfer between the crossed gratings t","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"1 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":"123027213","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":"A Multi-Band Dielectric-Loaded Horn Antenna with Two Feed Systems","authors":"Y. Akagi, H. Deguchi, M. Tsuji","doi":"10.1109/ICEAA.2019.8879112","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879112","url":null,"abstract":"For obtaining a novel horn with low cross-polarization components over multiple frequency bands, an axially symmetric dielectric rod with a tapered profile is loaded in the horn up to the aperture, and coaxial grooves are also loaded around the circular aperture. Thus, this paper presents a designed horn with two different types of waveguide-ports for feeding signals for 12/14 GHz (Ku band) and 20/30 GHz (Ka band), respectively, and evaluates the frequency characteristics at each band.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"47 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":"131108046","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":"On direct matching and efficiency improvements for integrated array antennas","authors":"Ahmad Emadeddin, B. Jonsson","doi":"10.1109/ICEAA.2019.8879178","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879178","url":null,"abstract":"The goal of this design study is to determine the insertion-loss associated with a sequence of impedance-matching networks. These results are compared to the performance of direct integration of PA/antenna. In high-frequency, ≥ 20GHz, co-design of PA/antenna has as an important goal to remove any matching networks between the antenna and power amplifier by e.g. antenna shaping both to reduce the physical size and to improve the power added efficiency of the radio-front end. We determine the insertion-loss for matching a 2W GaN RF Transistor TGF2942 working in Class-A to a given real-valued load. This type of reference can serve as a benchmark to compare co-designed antenna performance. We also determine changes in power added efficiency and insertion-loss associated with changes in the physical size of a sequence of differently sized matching-network. The results are examined with respect to the electrical size, choice of material (dielectric attenuation), and given $Z_{mathbf{ant}}$ & $Z_{mathbf{opt}}$. In the reference case, we observe that direct matching may improve the power added efficiency by 10% for a 5% frequency bandwidth and by 6% at the center frequency.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"1 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":"131149785","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":"Novel all-dielectric nanoantenna for efficient reflectors irradiation","authors":"A. Ospanova, A. Bugakova, A. Basharin","doi":"10.1109/ICEAA.2019.8879225","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879225","url":null,"abstract":"In this paper, we present a new kind of nanoantennas for effective illumination of parabolic surfaces, consisting of a dielectric hollow cylinder as a reflector and a dipole source as an emitter. Precisely chosen parameters of the nanoantenna design provides radiation pattern with broad main lobe and strongly suppressed side lobes. According to the simulation results, such pattern is quite similar to the ideal “$Pi$” configuration, necessary for efficient illuminating reflectors as shown in Figure 1.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"68 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":"116520365","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":"Realistic Simulation of Parallel Transmission in MRI","authors":"T. Stöcker","doi":"10.1109/ICEAA.2019.8879342","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879342","url":null,"abstract":"MR physics computer simulation is an important tool for rapid prototyping of new ideas, validating physical models and hypotheses, RF pulse design, or the generation of ground-truth data to test novel algorithms for image reconstruction and image analysis. In addition, MR simulations enable to investigate the limits of MRI, which are sometimes hard to explore in real experiments. If the simulator software correctly models hardware imperfections, then these effects can be studied in a controlled manner. Utilizing and extending the MRI simulation framework JEMRIS, this work demonstrates realistic parallel transmission MRI simulations.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"25 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":"121272119","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":"Using Embedded Element Patterns to Improve Aperture Array Calibration","authors":"S. Wijnholds, M. Arts, P. Bolli, P. Di Ninni, G. Virone","doi":"10.1109/ICEAA.2019.8878949","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8878949","url":null,"abstract":"Several existing and planned low-frequency (< 350 MHz) radio astronomical facilities exploit subarrays or stations consisting of receiving elements in an irregular configuration. Calibration of the RF path of each receiving element is crucial for accurate beamforming with these stations. Currently used station calibration methods usually assume that the embedded element patterns (EEPs) of the receiving elements within a station are identical. In this contribution, we show that ignoring the inter-element EEP variations causes systematic errors in the calibration results using the stations of the low-frequency receiving systems of the Square Kilometre Array (SKA) and the Low Frequency Array (LOFAR) as examples. We show that the magnitude of these errors increases with increasing EEP variations. We also discuss the challenges faced by SKA and LOFAR to mitigate these errors by exploiting a priori knowledge of the EEPs.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"68 3 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":"132759375","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":"Direct Solver for Quasi-Planar EM Scattering Problems","authors":"E. Chernokozhin, A. Boag","doi":"10.1109/ICEAA.2019.8879396","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879396","url":null,"abstract":"A fast direct solver for quasi-planar EM scattering problems is developed. The algorithm is based on multilevel domain decomposition, singular-value decomposition of partial operators, and factorization of the resulting operator.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"22 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":"133307273","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":"Tensor Train Acceleration of Method of Moments Solution of Volume Integral Equation on Structured and Unstructured Meshes","authors":"Z. Chen, S. Zheng, V. Okhmatovski","doi":"10.1109/ICEAA.2019.8879398","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879398","url":null,"abstract":"Method of Moments (MoM) discretization of the Integral Equations (IEs) of electromagnetics results in dense matrix equation. Such matrix equations require prohibitively large computational resources when the number of basis functions used in discretization reaches hundreds of thousands and higher. Tensor Train (TT) decomposition of the MoM dense matrix equations has been recently proposed [1] to drastically reduce both the memory use for matrix storage and the CPU time required for its multiplication with a vector. Toeplitz matrix resulting from MoM discretization of Volume Integral Equation (VIE) can be represented as a multi-dimensional matrix and stored as a product of smaller dimensional matrices (tensors). Such product of smaller dimensional matrices, also known as the tensor train (TT), can reduce the matrix storage from O(N2) to O(logN) at low frequencies and O(NlogN) at high frequencies. The product of the matrix in the TT form with a vector can be computed in O(NlogN) operations. In order to accelerate MoM solution of practical scattering problems we recently developed Conjugate-Gradient-Tensor-Train (CG-TT) [2] and Precorrected-Tensor-Train (P-TT) [3] algorithms.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"100 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":"134018144","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}