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

{"title":"Combining Near-Field Measurements and Numerical Simulations in the Complete Characterization of Complex Electromagnetic Systems","authors":"L. Foged, M. Saporetti, F. Saccardi, L. Scialacqua","doi":"10.1109/ICEAA.2019.8879177","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879177","url":null,"abstract":"Full wave simulations and antenna measurements based on near field techniques are two widely different but nevertheless preferred methods for engineers to characterize the radiating properties of complex electromagnetic systems. Examples of such systems are various platforms embarking antenna like satellites, planes, vehicles etc. [1]–[2].","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"14 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114029036","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 Novel Vertical Patch Antenna for Pattern Reconfiguration","authors":"M. Cao, Xuan Wang, Hao Li, Song Yue, Longwei He","doi":"10.1109/ICEAA.2019.8879139","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879139","url":null,"abstract":"A novel vertical patch antenna (VPA) for pattern reconfiguration is proposed. It consists of a VPA and a monopole antenna, which can operate independently. Simulation and experimental results show that the radiation patterns can be easily steered between omnidirectional pattern of 18% bandwidths and bidirectional pattern of 17.8% bandwidths. The whole radiation pattern can cover a beam range of 0∼90° in elevation angle with the gain greater than 0dB.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"20 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":"124370877","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":"Fast simulation technique for antenna installed on a finite ground plane","authors":"J. Cavillot, D. Tihon, C. Craeye, E. de Lera Acedo, N. Razavi-Ghods","doi":"10.1109/ICEAA.2019.8879358","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879358","url":null,"abstract":"An efficient spectral approach to compute the radiation pattern of an antenna installed on a rectangular finite ground plane itself lying on semi-infinite soil is presented. The rectangular ground plane is built using smaller rectangles such that the Method of Moments (MoM) matrix obtained for the ground plane is block Toeplitz. After some pre-computations, the inverse of the block Toeplitz matrix is decomposed as a sum of products of circulant matrices. The whole MoM system of equations is solved using the Schur's complement, enabling the use of the FFT for the circulant matrix-vector products. After that, the efficiency of the antenna (defined here as the fraction of the power radiated in the air to the power delivered at the feed of the antenna) is evaluated using a spectral approach. This quantity allows the determination of the noise on the antenna due to the presence of the soil.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"2 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":"127706562","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":"Imaging in the presence of direction-dependent effects with the MeerKAT radio telescope","authors":"O. Smirnov, B. Hugo, K. Asad, L. Bester, C. Tasse","doi":"10.1109/iceaa.2019.8879072","DOIUrl":"https://doi.org/10.1109/iceaa.2019.8879072","url":null,"abstract":"The radio interferometer measurement equation [1] describes the visibilities measured by a radio interferometer in the following succinct form [2]. For a pair of antennas (i.e. baseline) <tex>$p$</tex> and <tex>$q$</tex>, the measured <tex>$2times 2$</tex> complex visibility matrix <tex>$mathbf{V}_{pq}$</tex> is given by begin{equation*} mathbf{V}_{pq}=iintlimits_{lm}mathbf{E}_{p}mathbf{BE}_{q}^{H}mathrm{e}^{-2pi iotalambda^{-1}(mathbf{u}_{pq}cdotmathbf{l})}mathrm{d}lmathrm{d}m+mathbf{N}_{pq} tag{1} end{equation*} where <tex>$mathbf{B}(l, m)$</tex> is a <tex>$2times 2$</tex> matrix describing the (in general, polarized) sky brightness distribution on the tangential plane <tex>$l, m, mathbf{E}_{p}(l, m)$</tex> is a <tex>$2times 2$</tex> Jones matrix describing the propagation effects for antenna <tex>$p$</tex> in the direction <tex>$l, m, mathbf{u}_{pq}$</tex> is the baseline vector, <tex>$mathbf{l}=l, m, n$</tex> is the direction cosine vector, <tex>$lambda$</tex> is wavelength, and <tex>$mathbf{N}_{text{pq}}$</tex> is a <tex>$2times 2$</tex> additive complex normal noise term. Inverting eq. 1 to recover <tex>$mathbf{B}$</tex> from measurements is known as the imaging problem. The problem is ill-posed, particularly so if the <tex>$mathbf{E}$</tex> term is non-trivial (relative to the sensitivity of the telescope given by <tex>$mathbf{N}$</tex>); in the latter regime, it is known as the direction-dependent effect (DDE) problem.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"43 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":"126340220","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":"Detection Modalities of Displacement Sensors Based on Split Ring Resonators: Pros and Cons","authors":"A. K. Horestani, Z. Shaterian, F. Martín","doi":"10.1109/ICEAA.2019.8879162","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879162","url":null,"abstract":"The aim of this paper is to review various detection modalities of displacement sensors based on metamaterial-inspired resonators. With this aim, linear and angular displacement sensors based on split ring resonators are divided in two main categories: 1) Sensors based on the shift in the resonance frequency, and 2) sensors based on the symmetry properties of resonators. The second category can be divided in two subcategories: Type 1: sensors based on depth of notch, and Type 2: sensors based on frequency splitting. Principle of operation and examples of each sensing method are presented, and finally pros and cons of each method are summarized.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"4 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":"126431976","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":"CrowdParking: Crowdsourcing Based Parking Navigation in Autonomous Driving Era","authors":"Chao Zhu, Abbas Mehrabi, Yu Xiao, Y. Wen","doi":"10.1109/ICEAA.2019.8879201","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879201","url":null,"abstract":"Finding a free road side parking in urban area is considered as one of the most challenging driving tasks, especially for the autonomous vehicles with limited sight (e.g. short range sensing) and brain (compared with human beings). To assist autonomous vehicle parking in urban area, we propose a novel parking scheme CrowdParking, which applies crowdsourcing and vehicular fog computing to collect parking information from vehicles, locate free parking spaces from crowdsourced data. We also explore the variation of parking availability from a real world data set and find that the availability of specific parking lot has certain relationship with the traffic condition of nearby roads. Based on the observations, we propose the vision of estimating the parking availability with taking into account the traffic condition in neighborhood.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"18 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":"125712316","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":"Liquid crystal based miniaturized tunable FSS design","authors":"Guohui Yang, Xin Yang, Jishuang Yu, Qun Wu, F. Meng","doi":"10.1109/ICEAA.2019.8879182","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879182","url":null,"abstract":"Reconfigurable FSS is an important research direction of FSS research. The reconfigurable FSS can be changed to a suitable resonant frequency, bandwidth or resonant characteristic according to the changing electromagnetic environment, which has wide application value in many electromagnetic engineering environments. The current reconfigurable FSS design can be roughly classified into mechanical and electronically controlled reconfigurable FSS according to the control method. The liquid crystal-based tunable FSS is a kind of electronically controlled reconfigurable FSS. The equivalent dielectric constant of the liquid crystal changes under the action of the bias voltage, thereby changing the resonance characteristics of the FSS. At present, liquid crystal-based tunable FSS is generally tuned by covering a layer of liquid crystal on the FSS unit. This method uses a large amount of liquid crystal material, and the dielectric loss and material cost are high. In this paper, two miniaturized tunable FSS units are designed by loading a small number of liquid crystal cells. The first structure is based on the Jerusalem cross metal patch and the cross metal slit, and is miniaturized by the fractal of the cross-shaped structure, working in the C-band. The size of the structural unit is equivalent to ten of the working wavelength. In one part, the equivalent dielectric constant of the liquid crystal is changed by changing the voltage between the FSS layers, thereby changing the overall resonance frequency of the unit. The results show that the continuous adjustable range of the resonant frequency is 11.8% (compared to the lower resonant frequency). The second structure is based on a fractal mutual-coupled metal patch, which is miniaturized by loading the lumped element capacitance and inductance, and operates in the X-band. The size of the structural unit is equivalent to one-sixteenth of the operating wavelength. The resonance frequency is also adjusted by changing the voltage between the FSS layers. The results show that the continuous adjustable range of the resonant frequency is 11.5% (compared to the lower resonant frequency). The feasibility and rationality of this loading method are verified by two FSS structural designs, which can achieve tunability with less liquid crystal, reduce dielectric loss and material cost, and provide a new design idea for liquid crystal-based tunable FSS design.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"57 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":"125750283","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":"Conformal Dual Basis Functions on Curvilinear Quadrilaterals for Calderon Preconditioning of Surface Integral Equations","authors":"K. Sertel","doi":"10.1109/iceaa.2019.8879375","DOIUrl":"https://doi.org/10.1109/iceaa.2019.8879375","url":null,"abstract":"We present an implementation of the Calderon Multiplicative Preconditioner in the context of conformal quadrilateral discretizations of surface scattering problems. Conformal rooftop basis functions that are traditionally defined on pairs of quadratic quadrilateral elements [1] are augmented n this work by defining a set of conformal “dual” basis functions. The conformal dual basis functions are defined for each edge in the surface mesh and have their support on all conformal elements that share the edge and its two end nodes. As such, the dual basis functions flow across multiple elements in the general direction of the common edge. Similar to the Buffa-Christiansen basis functions [2], due to their expanded support, the proposed dual basis functions of curvilinear quadrilaterals span multiple elements around each edge, care must be taken to properly define each dual basis function across the mesh. A similar approach was recently presented in [3] using barycentric representation on bilinear quadrilaterals. Here, we implement the proposed dual basis functions on bi-quadratic quadrilateral elements and demonstrate the efficacy of the approach for accelerating the electric field integral equation (EFIE) representations of surface scattering problems. Thanks to the quasi-orthogonality of dual bases and the conventional rooftop bases, the Gram projection matrix is well-conditioned and the proposed Calderon Multiplicative Preconditioning of curvilinear geometry formulations leads to significant savings in the iterative solutions of the EFIE for geometries that have been known to cause convergence issues. As an example, the computed monostatic radar cross section (RCS) of a 10-inch-long ogive geometry is shown in Fig. 1 below for 9GHz. The mesh used in this example had 1,150 bi-quadratic quadrilaterals, leading to 2,300 unknowns. The conventional EFIE formulation took 650 iterations to converge in 11.8 seconds, whereas the proposed Calderon Preconditioner converged in 121 iterations, taking only 8.1 seconds for a residual of 10−6 on an Intel i7 processor using the conjugate gradient squared (CGS) iterative solver. As seen, albeit the increased computational cost per iteration, the overall savings provided by Calderon preconditioner is significant. When the same geometry is solved at a much lower frequency of 1.18GHz, the conventional moment method matrix became ill conditioned and did not converge after 5,000 iterations and 340 seconds, however, the proposed Calderon preconditioned approach converged in 266 iterations that took 4.82 seconds.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"8 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":"121976142","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":"THz Detector Calibration Based on Microwave Power Standards","authors":"A. Kazemipour, J. Hoffmann, D. Stalder, M. Wollensack, J. Rufenacht, M. Zeier","doi":"10.1109/ICEAA.2019.8879374","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879374","url":null,"abstract":"This paper describes the calibration process of a THz pyroelectric detector, to be traceable to a standard thermocouple sensor in WR10 waveguide-range (75-110GHz). Setup consists of a suitable waveguide-to-free-space adaptor (antenna) with relevant positioners to analyze and characterize the standing-wave ratio. The results are presented together with a preliminary error analysis and uncertainties.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"12 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":"122240245","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":"Modal Network Synthesis for Arbitrary Interconnection Structures Including Radiation","authors":"Sebastian Südekum, M. Leone","doi":"10.1109/ICEAA.2019.8879324","DOIUrl":"https://doi.org/10.1109/ICEAA.2019.8879324","url":null,"abstract":"A modal equivalent circuit for arbitrary interconnection structures including radiation is presented for the first time. The governing matrix equation of the discrete system representation obtained by the method of moments is solved exactly employing the eigenmodes of the quasi-static system. Due to the inherent radiation losses, the modes are mutually coupled, which has not been considered in all recently presented models and which is found to be responsible for the observed limitations. The network modelling includes the physical-based rational approximation of the intrinsic system dynamic, which is independent of the port positions. These in turn represent modal weighting factors, modelled by a transformer network. The model order is significantly reduced by the approximation of all sub-resonant (higher) modes by lumped elements. The accuracy and flexibility of the proposed SPICE-compatible equivalent circuit are shown by full-wave reference simulation in time-domain, including non-linear terminations.","PeriodicalId":237030,"journal":{"name":"2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)","volume":"376 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":"121759051","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}