To see the other types of publications on this topic, follow the link: Full-wave 3d electromagnetic modelling.
Journal articles on the topic 'Full-wave 3d electromagnetic modelling'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic 'Full-wave 3d electromagnetic modelling.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Xiong, Zonghou, Art Raiche, and Fred Sugeng. "Efficient solution of full domain 3D electromagnetic modelling problems." Exploration Geophysics 31, no. 1-2 (2000): 158–61. http://dx.doi.org/10.1071/eg00158.
Full text
2
Huang, Kui, Kailiang Lu, Jianmei Zhou, Xiu Li, and Lifei Meng. "3D full-time anisotropic TEM modelling using a mixed BDF2/SAI method." Journal of Geophysics and Engineering 18, no. 6 (2021): 995–1006. http://dx.doi.org/10.1093/jge/gxab066.
Full textAbstract:
Abstract Transient electromagnetic (TEM) data are affected by resistivity anisotropy, which should be considered in 3D modelling. The influence of anisotropy on full-time response is the main focus of this research. For spatial discretisation of an anisotropic model, the mimetic finite volume approach was applied. The accuracy of the shift-and-invert (SAI) Krylov subspace approach and the two-step backward differentiation formula (BDF2) for modelling 3D full-time electromagnetic data has been demonstrated. However, both algorithms require time-consuming calculations. The SAI technique requires a number of projection subspace constructions, whereas the BDF2 algorithm necessitates numerous coefficient matrix decompositions. We proposed a novel mixed BDF2/SAI algorithm in this paper, which combines the advantages of the two algorithms. The on-time response is computed using BDF2, while the off-time response is computed using the SAI-Krylov subspace method. The forward results of a 1D model with a half-sine waveform demonstrated that the new algorithm is accurate and faster than both the BDF2 algorithm and the SAI algorithm. During the full-time period, the forward results of a 3D anisotropic model with half-sine waveform show that abnormal responses can be induced. It was shown that the relative abnormal of ${{{\bf b}}_{\boldsymbol{z}}}$ is higher during the on-time period, while the relative abnormal of $\partial {{{\bf b}}_{\boldsymbol{z}}}/\partial t$ is higher during the off-time period. Furthermore, the change in relative anomaly is more obvious as the anisotropic block rotates around the x-axis. And the larger the rotation angle, the larger the relative anomaly.
3
Kudryashova’, Tatiana, Sergey Polyakov, and Nikita Tarasov. "A novel parallel algorithm for 3D modelling electromagnetic purification of water." MATEC Web of Conferences 210 (2018): 04027. http://dx.doi.org/10.1051/matecconf/201821004027.
Full textAbstract:
The computational fluid dynamic research in this work has focused on the problem of full-scale three-dimensional modelling water purification processes by the electromagnetic method. Presently, this method of purification was used in the final stage of processing for the production of ultrapure water. In spite of many field experiments, detailed data on such processes can be obtained only by the mathematical modelling. This way allows us to take into account many aspects, for example: real three-dimensional geometry, physical structure of the purification system, heterogeneous composition of the impurities, etc. And also, the mathematical modelling helps to optimize many parameters in order to improve a design of the purification system. Within the framework of the modelling problem, one of the important aspects is the correct description of the three-dimensional flow inside a specific purification system. For this purpose, various mathematical models and numerical approaches are implemented. In this paper, the flow calculation was realized on basis of the Navier-Stokes equations.
4
Eyraud, Christelle, Liisa-Ida Sorsa, Jean-Michel Geffrin, Mika Takala, Gérard Henry, and Sampsa Pursiainen. "Full wavefield simulation versus measurement of microwave scattering by a complex 3D-printed asteroid analogue." Astronomy & Astrophysics 643 (November 2020): A68. http://dx.doi.org/10.1051/0004-6361/202038510.
Full textAbstract:
Context. The small bodies of the Solar System, and especially their internal structures, are still not well-known. Studies of the interior of comets and asteroids could provide important information about their formation and also about the early Solar System. Aims. In this paper, we investigate the possibility of obtaining information about their inner structure from their response to an incident electromagnetic field in preparation for future space radar missions. Our focus is on experimental measurements concerning two analog models with the shape of 25143 Itokawa, a small rubble pile asteroid monitored by the Japanese space agency’s (JAXA) Hayabusa mission in 2005. Methods. The analog models prepared for this study are based on the a priori knowledge of asteroid interiors of the time. The experimental data were obtained by performing microwave-range laboratory measurements. Two advanced in-house, full-wave modelling packages – one performing the calculations in the frequency domain and the other one in the time domain – were applied to calculate the wave interaction within the analog models. Results. The electric fields calculated via both the frequency and time domain approach are found to match the measurements appropriately. Conclusions. The present comparisons between the calculated results and laboratory measurements suggest that a high-enough correspondence between the measurement and numerical simulation can be achieved for the most significant part of the scattered signal, such that the inner structure of the analog can be observed based on these fields. Full-wave modeling that predicts direct and higher order scattering effects has been proven essential for this application.
5
Ouedraogo, Adama, Boubacar Soro, Ramatou Konate, Fati Amadou Oumarou, and Dieudonné Joseph Bathiebo. "Investigation of the Polycrystalline Silicon PV Cell Efficiency in 3D Approximation versus Electromagnetic Field under Monochromatic Illumination." International Journal of Photoenergy 2021 (October 31, 2021): 1–14. http://dx.doi.org/10.1155/2021/5171351.
Full textAbstract:
This manuscript is about the electric output of the silicon (Si) photovoltaic (PV) cell versus the electromagnetic field of a radio wave and a monochromatic illumination in three-dimensional (3D) assumptions. The polarisation direction of the electromagnetic wave and power density are fixed. The electromagnetic wave is provided by electromagnetic emission sources such as the telecommunication, radio, or TV antennas. A PV system is installed in the vicinity of an electromagnetic emission source. The current produced by the PV cell is sensitive to electromagnetic field increase more than the electric voltage. The electromagnetic field causes the decomposition of the current into two components which are a transferred current and a leakage current. The transferred component provides the transmitted current to the external load while the leakage component gives the loss of the carrier charge into the junction. Consequently, this decomposition of the current shares the electric power in transferred electric power and leakage electric power. The transferred electric power is obtained only in the intermediate circuit, and the maximum power point (MPP) shifts to the short circuit situation as the junction dynamic velocity becomes the greatest. However, the leakage electric power corresponds to a loss of the minority carrier’s charge in the junction during the crossing of the junction. This loss causes a Joule heating effect of the junction. The heating of the junction causes the quality degradation of the PV cell mainly due to the electric component. The solar illumination wavelength is presenting the inversion phenomenon with the maximum of the electrical outputs of the silicon PV cell of around 0.70 μm which provides the greatest conversion efficiency. This value has been chosen for the modelling of the radio wave influence. Hence, the conversion efficiency increases when the PV system is far away from the electromagnetic emission source. PV system installation in the vicinity of an electromagnetic emission source is not advised.
6
Zverev, Alexey V., and Dmitrij E. Ipatov. "Features of radiometric quantities synthetic images formation in the IR region of the spectrum." Proceedings of the Russian higher school Academy of sciences, no. 4 (December 26, 2024): 7–14. https://doi.org/10.17212/1727-2769-2024-4-7-14.
Full textAbstract:
Physically correct synthetic images of 3D scenes in a given wavelength range are of great importance in solving some applied problems. Such data generation is based on a physical interactions modelling, including electromagnetic radiation propagation in a scene space. This paper presents the results of a ray tracing mechanism development in a 3D scene modeling software package. An algorithm for calculation radiative heat transfer that allows accounting a radiation from multiple bodies in the scene is proposed. In order to be executed on graphical processors it is implemented in form of shader programs. Each emitted ray, which simulates the propagation of an electromagnetic wave, undergoes no more than two interactions with bodies and makes an addition to an observed area radiation in a number of photons given wavelengths range and solid angle. To evaluate the algorithm a number of model scenes were proposed, on which comparative study was carried out in case of infrared region modeling. As results show, taking into account the mechanisms of radiative heat transfer allow for qualitative improvement of the resulting images and makes a significant contribution to the background signal.
7
International, Journal for Research In Science &. Advanced Technologies. "DESIGN OF HIGH GAIN ULTRA-WIDE BAND MULTI-INPUT MULTI-OUTPUT(MIMO) ANTENNA." International Journal for Research In Science & Advanced Technologies 25, no. 05 (2025): 24–32. https://doi.org/10.5281/zenodo.15574382.
Full textAbstract:
This project centers around the design and simulation of a high-gain ultrawideband (UWB) multiple-input multiple- output (MIMO) antenna using Ansys HFSS. The Proposed antenna operates within the UWB frequency range of 3.1 GHZ to 10.6 GHZ, boasting a compact design, high gain, and minimal coupling between its components. The design process in HFSS entails fine-tuning essential factors such as element spacing, feed configuration, and substrate selection to attain a broad impedance bandwidth, high diversity gain, and stable radiation patterns. In Ansys HFSS simulation, the use of full-wave 3d electromagnetic modelling guarantees accurate evaluation of both near-field and far-field parameters. The antenna's performance is assessed based on gain, directivity, VSWR, and return loss. The stability of the radiation pattern across the UWB spectrum guarantees consistent omnidirectional or directional performance, which is crucial for mobile and dynamic communication environments. The findings confirm the effectiveness of the proposed antenna for high-speed data communication systems, such as 5g, IOT, and UWB radar applications. Its compact size, high efficiency, and consistent radiation patterns make it a suitable choice for portable and space-limited devices. The HFSS based approach guarantees precise performance estimation, enabling the creation of cutting- edge UWB MIMO antennas for future communication systems. This thorough approach positions the proposed UWB MIMO antenna as a promising candidate for implementation in emerging technologies like autonomous vehicles, smart healthcare, industrial IOT, and beyond-5g systems.
8
Sabzali, Mansoor, and Iraj Jazirian. "IMPROVEMENT THE MODELLING OF ATMOSPHERIC EFFECTS FOR ELECTRONIC DISTANCE MEASUREMENT (EDM): ANALYSIS OF AIR TEMPERATURE, ATMOSPHERIC PRESSURE AND RELATIVE HUMIDITY OF AIR." Geodesy and cartography 48, no. 1 (2022): 20–30. http://dx.doi.org/10.3846/gac.2022.13616.
Full textAbstract:
The atmosphere is an undeniable source of error for any geodetic instruments. Surveyors require to have an accurate approximation of distance measurements in order to accurately determine the 3D coordinate of points. Electronic Distance Measurements (EDMs) are employed to measure accurate range to the target. They are typically functioning by laser in the domain of light or near infrared of electromagnetic spectrum (EM). Snell’s law has proved propagating wave through passing the different layers of atmosphere is deviated. This phenomenon is called the refractivity of wave. This deviation is introduced by different intersection between the beam and the object surface at different epochs of atmospheric change. By possessing the knowledge of group refractive index, it is possible to estimate the value of correction in ppm for measured distances caused by the variations in atmospheric elements. The changes in three components of air, temperature, pressure and humidity, in this study will be considered.
9
Pavlíček, Karel, Václav Kotlan, and Ivo Doležel. "Estimation of laser weld parameters using surrogate modelling technique." Journal of Electrical Engineering 69, no. 2 (2018): 170–76. http://dx.doi.org/10.2478/jee-2018-0021.
Full textAbstract:
Abstract A surrogate technique based on Gaussian Process (GP) is used for predicting quality of laser in case of laser welding process that may be supported by induction preheating. FEM-based solution of the problem is computationally expensive because it combines computation of 3D coupled nonlinear electromagnetic and temperature fields. The quality of laser welds is quantified with weld depth, which depends on a number of input parameters. The paper deals with two of them —thickness of the welded steel sheet and power of the laser beam. First, selected FEM simulations allow finding data describing the dependency between the two input parameters and weld depth. These data allow creating a surrogate model that is able to predict weld depth at any point close to the points where the results are known. The principal goal is to essentially save the computational time. The surrogate model also allows estimating prediction plausibility and running the full FEM calculation in cases where the prediction is not sufficiently accurate. The methodology is illustrated with a typical example whose results are discussed.
10
Kowalski, Matthias, Martin Hanke, and Christian Kreischer. "Electromagnetic sub-models for 3D edge-elements in transient non-linear simulation." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 41, no. 2 (2022): 659–73. http://dx.doi.org/10.1108/compel-06-2021-0215.
Full textAbstract:
Purpose Resolving eddy currents in three dimensions with finite elements, especially in geometrically complex structures, is very time consuming. Notable additional efforts will be required, if these eddy currents are influenced by magnetic fields arising from larger parts or range over widespread regions. The purpose of this article is to present a new sub-modelling simulation technique, based on the finite-element approach. This method offers remarkable advantages for solving this type of problems. Design/methodology/approach A novel sub-modeling technique is developed for the finite-element method addressing this problem by dividing the process into two steps: firstly, a simulation of a “source”-model is carried out providing magnetic field distributions within the entire domain neglecting local eddy current effects and without modeling it in full detailed geometry. A subsequent “sub”-model comprises only the region of interest in higher resolution and is solved while being constrained with boundary conditions derived from the previous source-model. An implementation in ANSYS Mechanical is carried out with the objective to validate finite-element simulation against measurement results. Findings The proposed simulation technique performs robustly and time efficiently. Applying this method to an end-region of a turbogenerator allows comparisons with test data of this region for validation purposes. The comparison between measured and simulated radial flux densities shows good correspondence. Originality/value This work is novel in many aspects: a new technique for three-dimensional (3D) finite-element method using edge-elements is introduced. To the best of the authors’ knowledge, for the first time, these 3D sub-models are compared against measurement results of an electric machine with net currents. Leveraged from this work, detailed analyses of eddy current phenomena under influences of external magnetic fields can be investigated in higher detail within shorter calculation times.
11
Pinel, Nicolas, Christophe Bourlier, Irina Sergievskaya, Nicolas Longépé, and Guillaume Hajduch. "Asymptotic Modeling of Three-Dimensional Radar Backscattering from Oil Slicks on Sea Surfaces." Remote Sensing 14, no. 4 (2022): 981. http://dx.doi.org/10.3390/rs14040981.
Full textAbstract:
This paper presents new results of a simulation of radar backscatter from oil slick areas on a real three-dimensional sea surface, based on a physical hydrodynamic model of surface wave damping in the presence of oil films, the local equilibrium model (MLB). To solve this problem, the modelling was carried out by using the first-order small-slope approximation (SSA1) model. It presents the advantage of having a very good compromise between rapidity and accuracy of the calculation. The choice of the model is justified by solving the two-dimensional problem with several asymptotic methods and further comparing the results with a rigorous numerical method, based on the Method of Moments (MoM). Two approaches called “thin-layer” (TL) and “classical” were used to deal with the double layer (air/oil/sea) problem. The TL approach assumes that this double-layer problem can be seen locally as a Fabry–Pérot interferometer, which implies that the Kirchhoff-tangent plane approximation (KA) is valid. The classical approach consists in neglecting the presence of the oil layer for dealing with electromagnetic backscattering, which is valid for very thin oil films compared to the electromagnetic (EM) wavelength. It is shown that these two approaches have rather complementary validity domains: The TL approach is always valid for small observation angles, which makes it suitable for near nadir sensors such as altimeters, whereas the classical approach is valid for moderate observation angles, which makes it suitable for most satellite applications. The 3D modelling results are compared with C-band and X-band measured data (CSK experiment and OOW NOFO experiment) in VV polarization. The calculation takes into account that the oil film on the sea surface is mainly in an emulsion state. The results highlighted the relevance of the MLB hydrodynamic model, as well as the SSA1 EM model combined wit the classical approach, for quantifying NRCS in seas contaminated with marine oil or surfactants. The agreement is indeed very good in the X-band range.
12
Kudryavtsev, I. V., M. M. Mikhnev, and P. N. Silchenko. "A Calculation Procedure for Strength Analysis of Wave Guides for Ensuring Improved Mass-Dimensional Parameters." Proceedings of Higher Educational Institutions. Маchine Building, no. 05 (722) (May 2020): 50–61. http://dx.doi.org/10.18698/0536-1044-2020-5-50-61.
Full textAbstract:
This paper presents a calculation procedure for designing waveguides with iproved mass-dimensional parameters, which ensures the required strength and stiffness characteristics under static, dynamic and deformational loads. The procedure is based on the analysis of methods for determining the stress-strain state of the waveguide-and-distribution systems of spacecraft. The first stage of the procedure involves modelling the waveguide-and-distribution systems in a general formulation by a rod structure with equivalent loading and fixing conditions and determining the stress-strain state of such a system. At the second stage, local areas with the maximum stress-strain state values are selected for a further refined analysis in the rod system. An evaluation of the influence of the waveguide wall thickness on the general stress-strain state is performed. It is shown that when the waveguide wall thickness varies in the range of 0.25 – 2.50 mm, the strength and stiffness of its sections under static loads basically follow the linear law. It is established that under dynamic loading the wall thickness has almost no effect on the resultant stress-strain state of the waveguide arising under the influence of forced fluctuations and quasi-static loading owing to its dependence on the ratios of mass, moments of inertia and resistance, which for some standard sizes of the waveguides will be almost constant. The equations obtained for the rod system cannot be used for evaluating the influence of the wall thickness on local stress-strain state in the form of wall deflection, local loss of stability, etc. In view of this, at the second stage of modelling local areas of interest are selected and transformed into 3D thin-walled structures, with translation into finite element method programs for a more exact analysis. In the future, the proposed technique can be used to solve connected problems of interrelation and the influence of cross-sectional deformations in local zones of the waveguide on the changes in electromagnetic fields with the formation of parasite waves. This will significantly improve the quality of radio engineering characteristics of the waveguide and distribution systems while ensuring their strength, stiffness and minimal mass-dimensional parameters.
13
Kozioł, Robert, Marcin Łapiński, Paweł Syty, et al. "Evolution of Ag nanostructures created from thin films: UV–vis absorption and its theoretical predictions." Beilstein Journal of Nanotechnology 11 (March 25, 2020): 494–507. http://dx.doi.org/10.3762/bjnano.11.40.
Full textAbstract:
Ag-based plasmonic nanostructures were manufactured by thermal annealing of thin metallic films. Structure and morphology were studied using scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM) and X-ray photoelectron spectroscopy (XPS). SEM images show that the formation of nanostructures is influenced by the initial layer thickness as well as the temperature and the time of annealing. The Ag 3d and Ag 4d XPS spectra are characteristic of nanostructures. The quality of the nanostructures, in terms of their use as plasmonic platforms, is reflected in the UV–vis absorption spectra. The absorption spectrum is dominated by a maximum in the range of 450–500 nm associated with the plasmon resonance. As the initial layer thickness increases, an additional peak appears around 350 nm, which probably corresponds to the quadrupole resonance. For calculations leading to a better illustration of absorption, scattering and overall absorption of light in Ag nanoparticles, the Mie theory is employed. Absorbance and the distribution of the electromagnetic field around the nanostructures are calculated by finite-difference time-domain (FDTD) simulations. For calculations a novel approach based on modelling the whole sample with a realistic shape of the nanoparticles, instead of full spheres, was used. This led to a very good agreement with the experiment.
14
Juntaupalee, Atawit, Rangsan Wongsan, Akkhapun Wannakomol, Peerasan Khamsalee, and Kiatsuradech Tansuwan. "A MODELING OF RF PROPAGATION FOR LOW FREQUENCY IN NATURAL CAVES WITH 3D MODEL SIMULATION." Suranaree Journal of Science and Technology 31, no. 3 (2024): 010305(1–11). http://dx.doi.org/10.55766/sujst-2024-03-e03769.
Full textAbstract:
The study of the RF propagation model within natural caves remains challenging. In the past, the propagation model in the tunnel was compared using waveguide theory because of the electrical conductivity of tunnel walls. However, waveguide models have limitations because a cut-off frequency from the tunnel dimension does not allow frequencies lower than the cut-off frequency to propagate. Although the frequency wave lower than the cut-off frequency cannot theoretically propagate, in practice, it can propagate through the cave. Therefore, this paper presents the modelling of RF propagation at low frequencies in natural caves using empirical methods by measuring the waves propagated within cave passages at the Chiang Dao Cave (limestone) and the Patihan Cave (sandstone). The measurement will focus on analyzing and comparing factors, propagation mechanisms, and behavior, which cover the frequencies at 300, 1000, 1650, 2325, and 3000 kHz, to develop the low-frequency attenuation model within the cave proposed in this paper. The 3D cave models obtained from a LiDAR scanner were used to calculate the physical factors of the cave walls, and then the path losses were calculated using our proposed model and compared to the experimental results. In addition, the path losses calculated using 1) CST simulation software and 2) the waveguide model were also compared with the results from the proposed model. The results obtained from the proposed model provide attenuation values similar to those of the experimental results. Finally, the concept of the low-frequency attenuation model can be used for the prediction and analysis of the propagation performance of low-frequency waves in caves, tunnels, or underground mines and lead to the development of cave communication technology and electromagnetic knowledge in the future.
15
VOLSKI, V., and G. VANDENBOSCH. "Full-wave electromagnetic modelling of fabrics and composites." Composites Science and Technology 69, no. 2 (2009): 161–68. http://dx.doi.org/10.1016/j.compscitech.2008.09.040.
Full text
16
Tsakmakidis, Kosmas, Bernard Weiss, and Ortwin Hess. "Full-wave electromagnetic modelling of an InP/InGaAs travelling-wave heterojunction phototransistor." Journal of Physics D: Applied Physics 39, no. 9 (2006): 1805–14. http://dx.doi.org/10.1088/0022-3727/39/9/016.
Full text
17
Kostka, Darryl, and Antonio Ciccomancini Scogna. "3D Electromagnetic Modeling of Through Silicon Vias and Interposers in Electronic Packaging." International Symposium on Microelectronics 2012, no. 1 (2012): 001057–67. http://dx.doi.org/10.4071/isom-2012-thp21.
Full textAbstract:
3D ICs promise “more than Moore” integration by packing a lot of functionality into small form factors. Interposers along with TSVs play an important role in 3D integration from an electrical, thermal and mechanical point of view. The goal of this paper is to electrically model TSVs and 3D interposers by means of three 3D full wave electromagnetic simulations. A comparative analysis of various configurations of signal delivery networks in 3D interposers for high speed signal transmission is presented.
18
Fang, Yong, Bao Qing Zeng, Wen Tao Zhang, and Pu Wang. "Millimeter Wave Characterization of Wire Bond Transitions for W-Band Electromagnetic Sensor." Applied Mechanics and Materials 738-739 (March 2015): 103–6. http://dx.doi.org/10.4028/www.scientific.net/amm.738-739.103.
Full textAbstract:
This paper presents millimeter wave characterization and models of various wire bond transitions between chip’s ground-signal-ground pad (GSG) and microstrip (MS), include single-wire-nomatch MS-GSG transition, double-wire-nomatch MS-GSG, single-wire-match MS-GSG transition, and double-wire-match MS-GSG transition. It also presents the 3D full-wave electromagnetic simulation. Analysis results show that the double-wire-match MS-GSG transition’s characteristic is better than other three transitions in the whole W band. The accurate extracted parameter values are used for the lumped equivalent circuit model, whose simulation results are good with the full wave simulation results. The error between lumped equivalent circuit and full-wave models is of the order of ±0.2dB for S11 and S21 in the frequency range 75 - 105GHz. The proposed lumped equivalent circuit is suitable to be implemented in commercial microwave CAD tools for the electromagnetic sensor designing.
19
Aleynikov, Pavel, and Nikolai B. Marushchenko. "3D Full-Wave modelling and EC mode conversion in realistic plasmas." EPJ Web of Conferences 203 (2019): 01003. http://dx.doi.org/10.1051/epjconf/201920301003.
Full textAbstract:
The wave physics of O-X conversion in overdense W7-X plasma is discussed. For this study, a new 3D, cold plasma full-wave code has been developed. The code takes advantage of massive parallel computations with Graphics Processing Units (GPU), which allows for up to 100 times faster calculations than on a single-CPU. A 3D calculation of the O-X conversion is demonstrated. We discuss limitations of the mode conversion scenario within the capabilities of the existing ECRH system in W7-X, and demonstrate an optimised conversion scenario in which the launching antenna location is altered. The conversion efficiency of the optimised scenario is predicted to be >85%.
20
Dash, Sasmita, Christos Liaskos, Ian F. Akyildiz, and Andreas Pitsillides. "Impact of Graphene Thickness on EM Modelling of Antenna." Materials Science Forum 1009 (August 2020): 75–80. http://dx.doi.org/10.4028/www.scientific.net/msf.1009.75.
Full textAbstract:
This paper presents illustrative electromagnetic modelling and simulation of graphene antenna using a two-dimensional graphene sheet of zero thickness and a three-dimensional graphene slab of finite thickness. The properties of the antenna are analyzed in terms of the S11 parameter, input impedance, VSWR, radiation pattern, and frequency reconfiguration using the full-wave electromagnetic simulator. Furthermore, this work numerically studies the modelling of graphene antenna using a three-dimensional graphene thin slab and the impact of graphene slab thickness on the performance of graphene antenna.
21
Wang, Zheng-bin, Jin Shi, and Jin-chang Chen. "High-Efficiency Electromagnetic Wave Controlling with All-Dielectric Huygens’ Metasurfaces." International Journal of Antennas and Propagation 2015 (2015): 1–7. http://dx.doi.org/10.1155/2015/432095.
Full textAbstract:
Subwavelength dielectric blocks with varying thicknesses are introduced to realize 0∼2πphase change. A Huygens’ metasurface composed of such nonuniform building blocks is shown to efficiently refract normally incident waves in a broadband. According to the same physical mechanism, we fabricate an electrically thin lens with concentric subwavelength dielectric blocks and integrate it with a patch antenna to form a three-dimensional (3D) ultra-low-profile lens antenna system. Full-wave simulation demonstrates the lens antenna’s excellent performances in high directivity, broadband, low loss, and low side-lobe levels.
22
Aleynikov, Pavel, and Nikolai B. Marushchenko. "3D Full-Wave modelling and mode conversion in realistic W7-X plasmas." EPJ Web of Conferences 149 (2017): 03007. http://dx.doi.org/10.1051/epjconf/201714903007.
Full text
23
Miessein, Désiré, Norman J. M. Horing, and Harry Lenzing. "Dyadic Helmholtz Green’s Function for Electromagnetic Wave Transmission/Diffraction through a Subwavelength Nano-Hole in a 2D Quantum Plasmonic Layer: An Exact Solution Using “Contact Potential”-like Dirac Delta Functions." Symmetry 14, no. 6 (2022): 1134. http://dx.doi.org/10.3390/sym14061134.
Full textAbstract:
The dyadic Helmholtz Green’s function for electromagnetic (EM) wave transmission/ diffraction through a subwavelength nano-hole in a two-dimensional (2D) plasmonic layer is discussed here analytically and numerically, employing “contact potential”-like Dirac delta functions in 1 and 2 dimensions (δ(z) and δ(x)δ(y)≡δ(2)(r→)). This analysis is carried out employing a succession of two coupled integral equations. The first integral equation determines the dyadic electromagnetic Green’s function G^fs for the full non-perforated 2D quantum plasma layer in terms of the bulk 3D infinite-space dyadic electromagnetic Green’s function G^3D, with δ(z) representing the confinement of finite quantum plasma conductivity to the plane of the plasma layer at z=0. The second integral equation determines the dyadic electromagnetic “hole” Green’s function G^hole for the perforated 2D quantum plasma layer (containing the nano-hole) in terms of the dyadic electromagnetic Green’s function G^fs for the full non-perforated 2D plasma layer, with δ(2)(r→) describing the exclusion of the quantum plasma layer conductivity properties from the nano-hole region in the vicinity of r→=0 on the plane. Taking the radius of the subwavelength nano-hole to be the smallest length scale of the system in conjunction with the 2D Dirac delta function representation of the excluded nano-hole plasma conductivity, both of the successive coupled integral equations are solved exactly, and we present a thorough numerical analysis (based on the exact analytic solution) for the resulting dyadic “hole” Green’s function G^hole in full detail in both 3D and density plots. This result has been successfully applied to the determination of electromagnetic wave transmission/diffraction through the nano-hole of the perforated quantum plasmonic layer, jointly with the EM wave transmission through the rest of the plasma layer. This success necessarily involves spatial translational asymmetry induced by the use of spatial Dirac delta functions confining finite conductivity to the 2D quantum plasma sheet and the excision at a bit of it about the origin to represent the nano-hole perforation, thus breaking spatial translational invariance symmetry.
24
Lu, Jie, Yuguo Li, and Zhijun Du. "Fictitious wave domain modelling and analysis of marine CSEM data." Geophysical Journal International 219, no. 1 (2019): 223–38. http://dx.doi.org/10.1093/gji/ggz288.
Full textAbstract:
SUMMARY Modelling marine controlled-source electromagnetic (CSEM) responses in the fictitious time domain is a novel approach, which facilitates the full exploration of EM diffusive properties in the fictitious wave domain (FWD). Concepts, such as reflections, refractions, diffractions and transmissions, which are used for the analysis of elastic wave propagation can thus be adopted in FWD for interpreting CSEM data. In this paper, we use a high-order finite difference time domain (FDTD) algorithm for modelling marine CSEM responses in both the fictitious time domain and the diffusive frequency domain. A complex frequency shifted perfectly matched layer (CFS–PML) boundary condition is adopted to the FDTD modelling. We demonstrate the performance of the CFS–PML boundary condition and validate the high-order FDTD code in the FWD with the half-space sea water model and in the frequency domain with the 1-D canonical reservoir model. We investigate and analyse the propagation characteristics of electromagnetic fields in the FWD, where we apply wave propagation concepts to interpret marine CSEM data. Similarities between wave and field propagations relevant for marine CSEM data are demonstrated through several 1-D to 3-D numerical examples.
25
Sun, Baojiang, Kai Xu, Fangfang Zhang, Jiaqi Xiao, and Xiao Liu. "An FPGA-Based signal acquisition system for 3D holographic azimuthal electromagnetic resistivity logging instruments." Journal of Physics: Conference Series 2807, no. 1 (2024): 012013. http://dx.doi.org/10.1088/1742-6596/2807/1/012013.
Full textAbstract:
Abstract A signal acquisition system of a 3D holographic azimuthal electromagnetic resistivity logging instrument while drilling is designed based on the Field Programmable Gate Array (FPGA). The azimuth electromagnetic wave resistivity logging instrument is mainly composed of transmitting coils, receiving coils, and control circuits. The signal acquisition system mainly includes the receiving coil and corresponding signal acquisition and processing circuit. First of all, the whole structure of the electromagnetic wave resistivity instrument system while drilling is briefly introduced, and then each function module of the acquisition board is elaborated in detail, and the hardware realization of the signal acquisition module and the corresponding FPGA program design flow chart are given. The acquisition system makes full use of the structured design of the module and First input First output (FIFO) cache technology and can complete the functions of signal acquisition, data transmission, and control on the acquisition board in real-time by using Serial Communication Interface (SCI) information transmission interface. The simulation results show that the system can realize the function of data acquisition and processing well.
26
Ugalde, Hernan, William A. Morris, and Cees van Staal. "The Bathurst Mining Camp, New Brunswick: data integration, geophysical modelling, and implications for exploration." Canadian Journal of Earth Sciences 56, no. 5 (2019): 433–51. http://dx.doi.org/10.1139/cjes-2018-0048.
Full textAbstract:
The Bathurst Mining Camp (BMC) is one of Canada’s oldest mining districts for volcanogenic massive sulphide (VMS) deposits. Most of the 46 known deposits were discovered in the 1950s using a combination of geological and geophysical methods. However, renewed exploration efforts over the past 15 years have not been as successful as one would expect given the level of expenditure of the camp. Nevertheless, this has created a large database of high resolution airborne geophysical data (magnetics, electromagnetics, radiometrics, and full tensor gravity gradiometry) which makes Bathurst a unique case. We show data compilation and map view interpretation, followed by two-and-a-half-dimensional (2.5D) gravity and magnetic modelling. From this, we provide constraints on the folded structure of the mafic and felsic volcanic units, and we interpret a large gravity anomaly in the southeast as a possible ophiolite or a dense thick package of basaltic rocks. Finally, we show an example of 3D modelling in the northwestern part of the camp, where we combine map view interpretation with section-based modelling and 3D geophysical inversion.
27
Hunziker, Jürg, Jan Thorbecke, and Evert Slob. "The electromagnetic response in a layered vertical transverse isotropic medium: A new look at an old problem." GEOPHYSICS 80, no. 1 (2015): F1—F18. http://dx.doi.org/10.1190/geo2013-0411.1.
Full textAbstract:
We determined that the electromagnetic vertical transverse isotropic response in a layered earth can be obtained by solving two equivalent scalar equations, which were for the vertical electric field and for the vertical magnetic field, involving only a scalar global reflection coefficient. Besides the complete derivation of the full electromagnetic response, we also developed the corresponding computer code called EMmod, which models the full electromagnetic fields including internal multiples in the frequency-wavenumber domain and obtains the frequency-space domain solutions through a Hankel transformation by computing the Hankel integral using a 61-point Gauss-Kronrod integration routine. The code is able to model the 3D electromagnetic field in a 1D earth for diffusive methods such as controlled source electromagnetics as well as for wave methods such as ground penetrating radar. The user has complete freedom to place the source and the receivers in any layer. The modeling is illustrated with three examples, which aim to present the different capabilities of EMmod, while assessing its correctness.
28
Santos, J. M., E. Ricardo, F. J. da Silva, T. Ribeiro, S. Heuraux, and A. Silva. "A 3D CAD model input pipeline for REFMUL3 full-wave FDTD 3D simulator." Journal of Instrumentation 16, no. 11 (2021): C11013. http://dx.doi.org/10.1088/1748-0221/16/11/c11013.
Full textAbstract:
Abstract The use of advanced simulation has become increasingly more important in the planning, design, and assessment phases of future fusion plasma diagnostics, and in the interpretation of experimental data from existing ones. The design cycle of complex reflectometry systems, such as the ones being planned for next generation machines (IDTT and DEMO), relies heavily on the results produced by synthetic diagnostics, used for system performance evaluation and prediction, both crucial in the design process decision making. These synthetic diagnostics need realistic representations of all system components to incorporate the main effects that shape their behavior. Some of the most important elements that are required to be well modelled and integrated in simulations are the wave launcher structures, such as the waveguides, tapers, and antennas, as well as the vessel wall structures and access to the plasma. The latter are of paramount importance and are often neglected in this type of studies. Faithfully modelling them is not an easy task, especially in 3D simulations. The procedure herein proposed consists in using CAD models of a given machine, together with parameterizable models of the launcher, to produce a description suited for Finite Difference Time Domain (FDTD) 3D simulation, combining the capabilities of real-world CAD design with the power of simulation. However, CAD model geometric descriptions are incompatible with the ones used by standard FDTD codes. CAD software usually outputs models in a tessellated mesh while FDTD simulators use Volumetric Pixel (VOXEL) descriptions. To solve this interface problem, we implemented a pipeline to automatically convert complex CAD models of tokamak vessel components and wave launcher structures to the VOXEL input required by REFMUL3, a full wave 3D Maxwell FDTD parallel code. To illustrate the full procedure, a complex reflectometry synthetic diagnostic for IDTT was setup, converted and simulated. This setup includes 3 antennas recessed into the vessel wall, for thermal protection, one for transmission and reception, and two just for reception.
29
Gounella, Rodrigo, Augusto Martins, Vinicius Pepino, Ben-Hur Viana Borges, and João Paulo Carmo. "A Low-Cost Instrument for Multidimensional Characterization of Advanced Wireless Communication Technologies." Applied Sciences 13, no. 11 (2023): 6581. http://dx.doi.org/10.3390/app13116581.
Full textAbstract:
Exploring the potential of 3D printing in electromagnetic wave manipulation, this paper introduces a novel, cost-effective instrument for microwave metasurface characterization. Metasurfaces, designed to alter wave propagation, are promising tools for enhancing antenna efficiency in advanced telecommunication methods, such as 5G systems. However, their complex profile characterization often poses significant challenges. Our proposed fully automated four-axis instrument, leveraging 3D printing capable of creating complex structures (such as metasurfaces), addresses these challenges by offering an efficient and precise solution. The instrument, costing approximately USD 1550, successfully characterized a metalens designed for modulating 30 GHz signals with a 20 cm focal distance, proving its utility. The 2D and 3D intensity distribution profiles and key parameters (including 8.05 dB gain, 11 cm 3 dB depth of focus, and 2.17 cm full width at half maximum) were extracted. Our measurements notably corresponded with the theoretical diffraction calculations, validating the instrument’s efficacy. This breakthrough significantly contributes to microwave metasurface characterization techniques which are vital for future millimeter-wave communication systems.
30
Gennarelli, Gianluca, Giovanni Ludeno, Noviello Carlo, Ilaria Catapano, and Francesco Soldovieri. "The Role of Model Dimensionality in Linear Inverse Scattering from Dielectric Objects." Remote Sensing 14, no. 1 (2022): 222. http://dx.doi.org/10.3390/rs14010222.
Full textAbstract:
This paper deals with 3D and 2D linear inverse scattering approaches based on the Born approximation, and investigates how the model dimensionality influences the imaging performance. The analysis involves dielectric objects hosted in a homogenous and isotropic medium and a multimonostatic/multifrequency measurement configuration. A theoretical study of the spatial resolution is carried out by exploiting the singular value decomposition of 3D and 2D scattering operators. Reconstruction results obtained from synthetic data generated by using a 3D full-wave electromagnetic simulator are reported to support the conclusions drawn from the analysis of resolution limits. The presented analysis corroborates that 3D and 2D inversion approaches have almost identical imaging performance, unless data are severely corrupted by the noise.
31
Hassefras, Emiel, Arno Volker, and Martin Verweij. "Efficient Guided Wave Modelling for Tomographic Corrosion Mapping via One-Way Wavefield Extrapolation." Sensors 24, no. 12 (2024): 3750. http://dx.doi.org/10.3390/s24123750.
Full textAbstract:
Mapping corrosion depths along pipeline sections using guided-wave-based tomographic methods is a challenging task. Accurate defect sizing depends heavily on the precision of the forward model in guided wave tomography. This model is fitted to measured data using inversion techniques. This study evaluates the effectiveness of a recursive extrapolation scheme for tomography applications and full waveform inversion. It employs a table-driven approach, with precomputed extrapolation operators stored across a spectrum of wavenumbers. This enables fast modelling for extensive pipe sections, approaching the speed of ray tracing while accurately handling complex velocity models within the full frequency band. This ensures an accurate representation of diffraction phenomena. The study examines the assumptions underlying the extrapolation approach, namely, the negligible reflection and conversion of modes at defects. In our tomography approach, we intend to use multiple wave modes—A0, S0, and SH1—and helical paths. The acoustic extrapolation method is validated through numerical studies for different wave modes, solving the 3D elastodynamic wave equation. Comparison with an experimentally measured single-mode wavefield from an aluminium plate with an artificial defect reveals good agreement.
32
Fedeli, Alessandro, Matteo Pastorino, and Andrea Randazzo. "A Hybrid Asymptotic-FVTD Method for the Estimation of the Radar Cross Section of 3D Structures." Electronics 8, no. 12 (2019): 1388. http://dx.doi.org/10.3390/electronics8121388.
Full textAbstract:
The Finite Volume Time-Domain (FVTD) method is an effective full-wave technique which allows an accurate computation of the electromagnetic field. In order to analyze the scattering effects due to electrically large structures, it can be combined with methods based on high-frequency approximations. This paper proposes a hybrid technique, which combines the FVTD method with an asymptotic solver based on the physical optics (PO) and the equivalent current method (ECM), allowing the solution of electromagnetic problems in the presence of electrically large structures with small details. Preliminary numerical simulations, aimed at computing the radar cross section of perfect electric conducting (PEC) composite objects, are reported in order to evaluate the effectiveness of the proposed method.
33
Xu, Min, Robert Geer, Pavel Kabos, and Thomas Wallis. "High Speed Signal Transmission using Through-Si Vias and Coplanar Waveguides in a 3D IC Test Structure." International Symposium on Microelectronics 2013, no. 1 (2013): 000228–32. http://dx.doi.org/10.4071/isom-2013-tp13.
Full textAbstract:
High frequency signal transmission through silicon substrates is critical for 3D heterogeneous integration. This paper presented fabrication, testing, and simulation of high-frequency interconnects based on through-silicon vias (TSVs) and coplanar waveguides (CPWs) for stacked 3D integrated circuits (3D ICs). Our simulation results showed that adding ground TSVs can improve signal transmission by 6× at 50GHz. We further investigated signal/ground TSV (1SXG) configurations for high-bandwidth signal transmission links. Scattering parameter measurements of fabricated 1SXG TSV structures for frequencies from 100MHz to 50GHz show low insertion loss (S21 less than −1dB up to 50GHz) and return loss (S11 lower than −15dB). These results indicate that these vertical interconnects exhibit good performance for high speed signal transmission. To understand the RF signal transmission in 3D interconnects, we used full wave electromagnetic simulation to investigate the electromagnetic field distribution associated with the ground TSV placement. We observed that the ground TSVs induced substantial overall field confinement, consistent with the experimental observation of improved signal transmission. Simulations also provided design guidance with respect to the substrate conductivity's impact on EM confinement and signal transmission.
34
Guo, Shuyu, Jie Wang, Xiangyu Xing, Jiaqi Xiao, and Xiao Liu. "Edge detection of formation boundary based on 3D holographic azimuthal electromagnetic wave resistivity logging tool." Journal of Physics: Conference Series 2901, no. 1 (2024): 012034. https://doi.org/10.1088/1742-6596/2901/1/012034.
Full textAbstract:
Abstract Geo-signals are critical in enabling the edge detection function of logging while drilling tools, with their detection depth directly reflecting the edge detection capability of the tool. To address the issue of insufficient edge detection distance in geological steering while drilling, a newly developed 3D holographic azimuthal electromagnetic wave resistivity logging tool is used to construct new geo-signals with full components to extend signal detection depth. By analyzing response characteristics in conjunction with downhole factors, it is determined that the tool can use this signal to express azimuthal information while completing formation boundary detection up to 9.6 meters in advance, with resistance to adverse effects in varying downhole environments.
35
Cao, S., B. L. N. Kennett, and B. R. Goleby. "A 3D isochronal modelling technique and its applications." Exploration Geophysics 20, no. 2 (1989): 205. http://dx.doi.org/10.1071/eg989205.
Full textAbstract:
Reflection seismic datasets are obtained in both the exploration of oil and mineral resources and the probing of the deep crust and the upper mantle. To interpret the datasets, considerable effort has been spent on the understanding of seismic wave propagation phenomena by simulating seismic wave propagations in some a priori physical models. A rather simple and efficient modelling technique has been developed to study elastic wave reflections with full inclusion of diffractions.This modelling technique employs an integral representation of reflections from a surface or a scatterer. High frequency asymptotic approximations are used for the propagation between the seismic source or receiver and a surface or a scatterer. At a scatterer, first order scattering is assumed. At a surface, reflection and transmission effects are estimated using the assumption of a locally plane interface and plane incident wave. With these approximations, the reflected seismograms are calculated by convolving the time derivative of a source function with a model weight function for a particular source-receiver pair. The weight function at a particular time is evaluated by a line integral along a contour of equal total travel time from source to receiver via the scattering surface (an isochron). The kernel of this integral at a reflecting point is the local reflection coefficient which which represents the effects of the amplitude of material parameter contrasts at the reflecting point, the angles between the incoming and outgoing waves and the local surface normal and the local speed of advance of the isochron on the surface, and the geometrical spreading factors from the source and receiver to the reflecting point.This modelling technique is used to investigate the validity of some of the interpretations of a deep crustal reflection profile collected in central Australia. The modelling results confirm that even with a relatively short (4 km) field spread it would be possible to pick up the reflected energy from faults with dips of about 40�. The largest fault, the Redbank Zone, has significant displacement of the crust-mantle boundary and within the fault zone, it is conceivable to have considerable variability in physical properties.The deep seismic section shows this boundary as a thick (0.5s) band of complex reflections and diffractions at the reflection time appropriate to the crust-mantle transition. Two possible structures for the crust-mantle boundary were investigated, one where the crustal faults have displaced this interface and created a 'block-faulted' geometry and the other where the crustal faults are listric near the boundary and appear to sole out on the crust-mantle interface, giving rise to an undulation of the Moho. The modelling results (Figure 1) for an undulating boundary show a band of reflections which strongly resemble the observed seismic reflection data.
36
Ye, Dexin, Ling Lu, John D. Joannopoulos, Marin Soljačić, and Lixin Ran. "Invisible metallic mesh." Proceedings of the National Academy of Sciences 113, no. 10 (2016): 2568–72. http://dx.doi.org/10.1073/pnas.1600521113.
Full textAbstract:
A solid material possessing identical electromagnetic properties as air has yet to be found in nature. Such a medium of arbitrary shape would neither reflect nor refract light at any angle of incidence in free space. Here, we introduce nonscattering corrugated metallic wires to construct such a medium. This was accomplished by aligning the dark-state frequencies in multiple scattering channels of a single wire. Analytical solutions, full-wave simulations, and microwave measurement results on 3D printed samples show omnidirectional invisibility in any configuration. This invisible metallic mesh can improve mechanical stability, electrical conduction, and heat dissipation of a system, without disturbing the electromagnetic design. Our approach is simple, robust, and scalable to higher frequencies.
37
Mańko, Monika. "Electromagnetic simulation of low-pass birdcage coil." MATEC Web of Conferences 252 (2019): 05011. http://dx.doi.org/10.1051/matecconf/201925205011.
Full textAbstract:
Magnetic resonance imaging (MRI) is a widely used non-invasive imaging modality that provides a variety of high-resolution soft-tissue contrast and functional information. The development of imaging technique employing the phenomenon of nuclear magnetic resonance is focused on obtaining the best possible tissue contrast, maximisation of ratio defined by signal-to-noise-ratio (SNR) and improving the image quality. SNR can be improved by the use of contrast agents and higher-field scanners, however these are better RF coils that often provide more significant gains. Using full-wave analysis and design tools becomes especially important when the coil dimensions approach a significant fraction of a wavelength. In this paper, modelling of RF coil is presented by using special-purpose software for electromagnetic simulations. The methodology of the research assumes making numerical calculations of RF coil. The presented approach of a design of radiofrequency (RF) coils for MRI scanners using lumped circuit modelling based techniques begins to fail at high frequencies, and therefore more accurate models based on the electromagnetic field calculations must be used. This paper presents simple simulations of the electric and magnetic field in LP birdcage coil.
38
McCowen, A., and B. G. Salman. "Efficient modelling of finite-size ungrounded PCBs with a full wave 3D moment-method analysis." Electronics Letters 35, no. 17 (1999): 1410. http://dx.doi.org/10.1049/el:19991002.
Full text
39
Narasimhan, Srinidhi Raghavan, and A. Ege Engin. "High Frequency Signal Propagation in Through Silicon Vias." International Symposium on Microelectronics 2012, no. 1 (2012): 000239–43. http://dx.doi.org/10.4071/isom-2012-tp12.
Full textAbstract:
The 3D IC integration technology and silicon interposers rely on through silicon vias (TSVs) for vertical interconnections. Hence, the medium carrying high frequency signals is lossy silicon (Si). Fundamental understanding of wave propagation through TSVs is essential for successful implementation of 3D IC integration technology as well as for the development of Si interposers at RF/microwave frequencies. The focus of this paper is characterization and modelling of TSVs and Si to explore high speed signal propagation through the lossy Si medium. To understand better the physical significance of the TSV, we will establish a framework for wave propagation through TSVs based on dielectric quasi-TEM, skin effect, and slow-wave modes similar to MIS micro-strip lines. For validation of the existence of these modes, full wave simulation results will be compared with simpler two dimensional transmission line simulators.
40
Pittella, Erika, Emanuele Piuzzi, Pietro Russo, and Francesco Fabbrocino. "Microwave Characterization and Modelling of PA6/GNPs Composites." Mathematical and Computational Applications 27, no. 3 (2022): 41. http://dx.doi.org/10.3390/mca27030041.
Full textAbstract:
The interest in composite materials has increased in the last decades since they have the advantages of combining intrinsic properties of each component and offer better performance with respect to the base constituents. In particular, these kinds of materials can have different electrical characteristics by varying the filling percentage and, therefore, they can be used in diverse applications. Thus, a detailed study of the microwave response of these composite systems is of great practical importance. In fact, the dielectric constant and loss tangent are key factors in the design of microwave components. In this frame, the outstanding properties of graphene-like fillers may be exploited to develop new very interesting materials to study and characterize. In this paper, microwave characterization of compounds, based on nylon 6 containing different percentages of graphene nanoplatelets, is carried out taking the neat matrix sample processed under the same conditions as benchmark. The measurements were carried out using two microwave systems, operating at two different frequency bands, appropriate to characterize solid and compact material samples. The achieved results, in line with limited data from the literature and from material data sheets, highlight the possibility to use the present polymers as an excellent electromagnetic interference shielding, as confirmed by full wave electromagnetic numerical simulations that were conducted with a numerical electromagnetic software.
41
Angiulli, Giovanni, Mario Versaci, Salvatore Calcagno, and Paolo Di Barba. "Quick retrieval of effective electromagnetic metamaterial parameters by using a Multi-fidelity Surrogate Modelling approach." European Physical Journal Applied Physics 90, no. 2 (2020): 20901. http://dx.doi.org/10.1051/epjap/2020200014.
Full textAbstract:
Electromagnetic metamaterials (MMs) are artificial composites that exhibit exceptional physical characteristics. Their design, which relies on the retrieving of the effective medium parameters, is usually a very time-consuming process because of the high number of full-wave simulations involved in this task. To alleviate the related computational burden, we propose to use a Multi-fidelity Surrogate Modelling (MFSM) approach. Numerical results demonstrate that this methodology turns out to be promising for a quick evaluation of the scattering parameters from which the effective constitutive parameters of a MM are retrieved, as shown by two numerical examples.
42
Lu, Junbin, Jie Jing, Xiaobin Zhou, et al. "Vat photopolymerization 3D printing gyroid meta-structural SiOC ceramics achieving full absorption of X-band electromagnetic wave." Additive Manufacturing 78 (September 2023): 103827. http://dx.doi.org/10.1016/j.addma.2023.103827.
Full text
43
Park, Eunyoung, and Sangkil Kim. "Design and Analysis of a TEM Mode Rectangular Coaxial Waveguide for Mobile 5G Millimeter Wave Antenna Module Applications." Journal of Electromagnetic Engineering and Science 20, no. 3 (2020): 169–75. http://dx.doi.org/10.26866/jees.2020.20.3.169.
Full textAbstract:
In this paper, design and analysis of a transverse electromagnetic (TEM) mode rectangular coaxial waveguide for a mobile 5G millimeter wave (mmWave) antenna module are presented. General structures of 5G radio frequency (RF) module for mobile sub-6 GHz and mmWave applications are also discussed in this paper. Thorough analysis of transmission line and waveguide structures at mmWave frequency band is essential and fundamental information to design highly integrated RF front-end modules. Theoretical design equations of the waveguide, such as impedance, loss, and radiation are presented, and the equations are verified by a full wave 3D FEM electromagnetic simulator. Impedance value of the rectangular waveguide structure was calculated using the conformal mapping method. Theoretical operation frequency bandwidth and design guide are also presented. The characteristics and analysis of the rectangular coaxial waveguide structure presented in this paper is easily scalable to other frequency bands. The proposed design equations are also applicable to various planar layer-by-layer integrated circuit (IC) or module manufacturing process.
44
Melouki, Noureddine, Fahad Ahmed, Peyman PourMohammadi, et al. "3D-Printed Conformal Meta-Lens with Multiple Beam-Shaping Functionalities for Mm-Wave Sensing Applications." Sensors 24, no. 9 (2024): 2826. http://dx.doi.org/10.3390/s24092826.
Full textAbstract:
In this paper, a 3D conformal meta-lens designed for manipulating electromagnetic beams via height-to-phase control is proposed. The structure consists of a 40 × 20 array of tunable unit cells fabricated using 3D printing, enabling full 360° phase compensation. A novel automatic synthesizing method (ASM) with an integrated optimization process based on genetic algorithm (GA) is adopted here to create the meta-lens. Simulation using CST Microwave Studio and MATLAB reveals the antenna’s beam deflection capability by adjusting phase compensations for each unit cell. Various beam scanning techniques are demonstrated, including single-beam, dual-beam generation, and orbital angular momentum (OAM) beam deflection at different angles of 0°, 10°, 15°, 25°, 30°, and 45°. A 3D-printed prototype of the dual-beam feature has been fabricated and measured for validation purposes, with good agreement between both simulation and measurement results, with small discrepancies due to 3D printing’s low resolution and fabrication errors. This meta-lens shows promise for low-cost, high-gain beam deflection in mm-wave wireless communication systems, especially for sensing applications, with potential for wider 2D beam scanning and independent beam deflection enhancements.
45
Ferencz, O. E., Cs Ferencz, P. Steinbach, et al. "The effect of subionospheric propagation on whistlers recorded by the DEMETER satellite – observation and modelling." Annales Geophysicae 25, no. 5 (2007): 1103–12. http://dx.doi.org/10.5194/angeo-25-1103-2007.
Full textAbstract:
Abstract. During a routine analysis of whistlers on the wide-band VLF recording of the DEMETER satellite, a specific signal structure of numerous fractional-hop whistlers, termed the "Spiky Whistler" (SpW) was identified. These signals appear to be composed of a conventional whistler combined by the compound mode-patterns of guided wave propagation, suggesting a whistler excited by a lightning "tweek" spheric. Rigorous, full-wave modelling of tweeks, formed by the long subionospheric guided spheric propagation and of the impulse propagation across an arbitrarily inhomogeneous ionosphere, gave an accurate description of the SpW signals. The electromagnetic impulses excited by vertical, preferably CG lightning discharge, exhibited the effects of guided behaviour and of the dispersive ionospheric plasma along their paths. This modelling and interpretation provides a consistent way to determine the generation and propagation characteristics of the recorded SpW signals, as well as to describe the traversed medium.
46
Khushboo, Gupta, and Sachin Rathi Dr. "Modeling of Wireless Sensor Networks in an Energy-Efficient Manner Using Quantum Physics." Journal of Computer Science Engineering and Software Testing 5, no. 1 (2019): 20–29. https://doi.org/10.5281/zenodo.2592994.
Full textAbstract:
<em>A Wireless Sensor Networks (WSNs) consists of huge number of Sensor Nodes (SNs) which communicates to each other by wireless technologies. Modelling of WSN becomes unmanageable when uncertain conditions of the network occur. A significant issue ofWSN in the present scenario is the inadequate availability of energy within SNs. Therefore making optimal use of energy is essential in modelling a WSN. In this paper, we have proposed a novel model of WSN by using the concepts of atomic bonding on a 3D plane using a percolation model, which is a random graph in those edges are formed between the neighbouring SNs. We have related the Energy model of an atom, concepts of Electromagnetics, Quantum Mechanics and Wave Duality to WSN by doing an approximate exploration of the severalprinciples and theories. The positioning of SNs are determined by the model, which is developed by the investigation and analysis done wrt atomic bonding theories. Our model developed by using the concepts of graph theory and probability distribution will be more efficient in terms of energy consumption and power utilisation.</em>
47
Korepanov P. A., Bakharev N. N., Gusakov E. Z., and Dyachenko V. V. "Modelling of three-ion ICRF heating scenario for tokamak Globus-M2." Technical Physics 92, no. 5 (2022): 595. http://dx.doi.org/10.21883/tp.2022.05.53675.327-21.
Full textAbstract:
The goal of this paper is to assess the possibility of using a new three-ion ICRF heating scheme on the spherical tokamak Globus-M2. In the first place, the operating frequencies and positions of cyclotron harmonics were found. Matching with frequency band of RF system of Globus-M2 was made. The absorption of electromagnetic waves was modeled using a one-dimensional full-wave code. Since the appearance of high-energy particles is expected in the three-ion ICRF scheme of heating special attention is paid to a comparing the estimates for generated particles energies with their confinement in tokamak Globus-M2. Keywords: nuclear fusion, tokamak, high temperature plasma, Globus-M, ICRF heating, three-ion ICRF, H-D-3He plasma.
48
Białkowski, Marek E., Hyok J. Song, and Paweł Kabacik. "A broadband uniplanar quasi-Yagi antenna - parameter study in application to a spatial power combiner." Journal of Telecommunications and Information Technology, no. 4 (December 30, 2001): 41–47. http://dx.doi.org/10.26636/jtit.2001.4.79.
Full textAbstract:
A parameter study is performed of a broadband uniplanar quasi-Yagi antenna with regard to its design and use in a~spatial power combiner. A 3D full-wave electromagnetic field analysis is applied to identify parameters, which mostly affect the design frequency and operational bandwidth of this antenna. Optimal design conditions are determined. Using these design criteria a passive spatial power combiner employing trays of back-to-back connected quasi-Yagi antennas is developed. This combiner is investigated in terms of insertion losses and field uniformity, which are key factors in obtaining high power combining efficiency.
49
Giannetti, Giacomo, and Ludger Klinkenbusch. "A Numerical Alternative for 3D Addition Theorems Based on the Bilinear Form of the Dyadic Green's Function and the Equivalence Principle." Advances in Radio Science 22 (September 6, 2024): 9–15. http://dx.doi.org/10.5194/ars-22-9-2024.
Full textAbstract:
Abstract. A numerical method based on the equivalence principle and the dyadic Green's function is presented. It can be used to compute the spherical-multipole amplitudes with respect to an origin in a subdomain 2 due to sources in a distinct subdomain 1. As an example, consider that subdomain 1 contains a horn antenna that is solved numerically using a commercial full-wave simulator. The radiated field serves as the incident field for subdomain 2 which contains the scatterer, in our example a lossless dielectric sphere. The proposed method is based on the equivalence currents on a Huygens surface enclosing the antenna and uses the free-space dyadic Green's function to compute the electric and magnetic fields on a sphere enclosing the scatterer. From this electromagnetic field on the spherical surface, the spherical-multipole amplitudes of the incident field with respect to the center of the sphere enclosing the scatterer are obtained numerically and can be further processed. The results obtained with this method are compared to the results solely computed by the numerical full-wave simulator.
50
Gungor, Arif Can, Marzena Olszewska-Placha, Malgorzata Celuch, Jasmin Smajic, and Juerg Leuthold. "Advanced Modelling Techniques for Resonator Based Dielectric and Semiconductor Materials Characterization." Applied Sciences 10, no. 23 (2020): 8533. http://dx.doi.org/10.3390/app10238533.
Full textAbstract:
This article reports recent developments in modelling based on Finite Difference Time Domain (FDTD) and Finite Element Method (FEM) for dielectric resonator material measurement setups. In contrast to the methods of the dielectric resonator design, where analytical expansion into Bessel functions is used to solve the Maxwell equations, here the analytical information is used only to ensure the fixed angular variation of the fields, while in the longitudinal and radial direction space discretization is applied, that reduced the problem to 2D. Moreover, when the discretization is performed in time domain, full-wave electromagnetic solvers can be directly coupled to semiconductor drift-diffusion solvers to better understand and predict the behavior of the resonator with semiconductor-based samples. Herein, FDTD and frequency domain FEM approaches are applied to the modelling of dielectric samples and validated against the measurements within the 0.3% margin dictated by the IEC norm. Then a coupled in-house developed multiphysics time-domain FEM solver is employed in order to take the local conductivity changes under electromagnetic illumination into account. New methodologies are thereby demonstrated that open the way to new applications of the dielectric resonator measurements.