Propagation Analysis of Electromagnetic Waves in 700 MHz Band at Intersection for Inter-Vehicle Communications Using the FDTD Method

2011 ◽  
Vol E94-C (1) ◽  
pp. 18-23 ◽  
Author(s):  
Kenji TAGUCHI ◽  
Tatsuya KASHIWA ◽  
Kohzoh OHSHIMA ◽  
Takeshi KAWAMURA
Keyword(s):  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Propagation Analysis

Predicting Multi-Order Magnetic Polaritons Resonance in SiC Slit Arrays by Mutual Inductor–Inductor–Capacitor Circuit Model

2020 ◽  
Vol 142 (7) ◽  
Author(s):  
Yanming Guo ◽  
Bo Xiong ◽  
Yong Shuai
Keyword(s):  
Electromagnetic Field ◽  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Circuit Model ◽  
Radiative Properties ◽  
Field Calculation ◽  
Thermal Radiative Properties ◽  
Resonance Frequencies ◽  
Lc Circuit ◽  
Calculation Results

Abstract Magnetic polariton (MP) that couples electromagnetic waves with magnetic excitation can be predicted by equivalent inductor–capacitor (LC) circuit model. However, when the resonance frequencies of MP and surface phonon polariton (SPhP) is close, the absorption and transmission peaks predicted by LC circuit model are far different from solving electromagnetic field calculation results. In this work, absorption and transmission enhancements with a SiC slit array are theoretically demonstrated within the SiC phonon absorption band with finite difference time-domain (FDTD) method. The interactions between SPhP and MP are confirmed by electromagnetic field distributions. Mutual inductor–inductor–capacitor (MLC) circuit model is used to predict the multiorder MP resonance conditions, and the coupling between MP and SPhP is treated as a mutual inductor in MLC model. The geometric effects of SiC slit arrays are investigated and MLC circuit model works well. This study may contribute to the design and prediction of thermal radiative properties and micro-/nanostructure metamaterials thermal radiative properties database building.

Debye Coefficients for Biological Tissues From 100 MHz to 100 GHz

2021 ◽  
Vol 35 (11) ◽  
pp. 1424-1425
Author(s):  
Rachel Lumnitzer ◽  
Allison Tanner ◽  
Atef Elsherbeni
Keyword(s):  
Numerical Analysis ◽  
Human Body ◽  
Complex Permittivity ◽  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Biological Tissues ◽  
Expansion Coefficients ◽  
Numerical Solver

Debye modeling of dispersive, biological tissues allows for the numerical analysis of electromagnetic waves in the vicinity of a human body using the FDTD method. Three-term Debye expansion coefficients for 55 human biological tissues are determined via a two-step numerical solver. The Debye coefficients obtained predict precisely the complex permittivity of the experimentally available tissue data.

Numerical Investigation on Interference and Absorption of Electromagnetic Waves in the Plasma-Covered Cavity Using FDTD Method

2012 ◽  
Vol 40 (4) ◽  
pp. 1010-1018 ◽  
Author(s):  
Xiang He ◽  
Jianping Chen ◽  
Xiaowu Ni ◽  
Yudong Chen ◽  
Xiaojun Zeng ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Electromagnetic Waves ◽  
Fdtd Method

scholarly journals Performance advantages of CPML over UPML absorbing boundary conditions in FDTD algorithm

2017 ◽  
Vol 68 (1) ◽  
pp. 47-53 ◽  
Author(s):  
Branko D. Gvozdic ◽  
Dusan Z. Djurdjevic
Keyword(s):  
Boundary Conditions ◽  
Electromagnetic Waves ◽  
Fdtd Method ◽  
Absorbing Boundary Conditions ◽  
Numerical Code ◽  
Computational Domain ◽  
Absorbing Boundary ◽  
Simulation Performance ◽  
Efficient Type ◽  
Computer Resources

Abstract Implementation of absorbing boundary condition (ABC) has a very important role in simulation performance and accuracy in finite difference time domain (FDTD) method. The perfectly matched layer (PML) is the most efficient type of ABC. The aim of this paper is to give detailed insight in and discussion of boundary conditions and hence to simplify the choice of PML used for termination of computational domain in FDTD method. In particular, we demonstrate that using the convolutional PML (CPML) has significant advantages in terms of implementation in FDTD method and reducing computer resources than using uniaxial PML (UPML). An extensive number of numerical experiments has been performed and results have shown that CPML is more efficient in electromagnetic waves absorption. Numerical code is prepared, several problems are analyzed and relative error is calculated and presented.

scholarly journals FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey V. Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Electromagnetic Waves ◽  
Phase Contrast ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Inhomogeneous Media ◽  
Close Packing ◽  
Fdtd Simulation ◽  
Magnetic Media ◽  
Sine Signal ◽  
Diffuse Distribution

An algorithm for the numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the FDTD method has been developed. The formulated algorithm is suitable for analyzing the main timing characteristics, as well as identifying the features of the propagation of various types of signals in both time-independent and time-dependent layered randomly inhomogeneous media. The simulation of the propagation of the sine pulse, sine signal and square wave in time-independent magnetic randomly inhomogeneous media with a various levels of phase contrast of two types - with a “diffuse” distribution of inhomogeneities and their “close packing” is carried out. The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

scholarly journals FDTD simulation of electromagnetic wave propagation in magnetic randomly inhomogeneous media

2021 ◽  
Author(s):  
Pavel Makarov ◽  
Vladimir Ustyugov ◽  
Leonid Kotov ◽  
Sergey V. Nekipelov ◽  
Viktor Sivkov
Keyword(s):  
Electromagnetic Waves ◽  
Phase Contrast ◽  
Electromagnetic Wave Propagation ◽  
Fdtd Method ◽  
Inhomogeneous Media ◽  
Close Packing ◽  
Fdtd Simulation ◽  
Magnetic Media ◽  
Sine Signal ◽  
Diffuse Distribution

An algorithm for the numerical simulation of the propagation of electromagnetic waves in randomly inhomogeneous magnetic media by the FDTD method has been developed. The formulated algorithm is suitable for analyzing the main timing characteristics, as well as identifying the features of the propagation of various types of signals in both time-independent and time-dependent layered randomly inhomogeneous media. The simulation of the propagation of the sine pulse, sine signal and square wave in time-independent magnetic randomly inhomogeneous media with a various levels of phase contrast of two types - with a “diffuse” distribution of inhomogeneities and their “close packing” is carried out. The influence of the concentration of magnetic granules and the type of their distribution on the characteristics of the transmitted and reflected signals is revealed.

scholarly journals Analysis of the influence of the complex structure of clay hollow bricks on the values of electric field intensity by using the FDTD method

2016 ◽  
Vol 65 (4) ◽  
pp. 745-759 ◽  
Author(s):  
Agnieszka Choroszucho
Keyword(s):  
Electric Field ◽  
Field Intensity ◽  
Electromagnetic Waves ◽  
Electric Field Intensity ◽  
Complex Structure ◽  
Fdtd Method ◽  
5 Ghz ◽  
Wave Phenomena ◽  
Hollow Bricks ◽  
Distribution Of Electric Field

Abstract The study presents the analysis of the effects occurring at the propagation of electromagnetic waves within an area containing non-ideal, non-homogenous and absorbing dielectric. The analysed models are connected with housing constructions and include single and double-layered walls made of clay hollow bricks. The influence of the size of holes, the contained clay mass percentage and conductivity of brick on the distribution of electric field is presented. Double-layered wall causes more heterogeneity in distribution of electric field and numerous maxima and minima to compare with singlelayered construction. The presented results refer to the electromagnetic field generated by a wireless communication system (Wi-Fi), operating within the standard frequencies (2.4 GHz and 5 GHz). A FDTD method was used to the analysis of electric field distribution. Also in this paper all formulations of difference method (FDTD) is presented. The possibilities of modifying the described method are indicated too. The obtained values of electric field intensity allow to determining the attenuation coefficient for different variants of the walls. Detailed analysis of influence of different types of building construction will make it possible to better understand the wave phenomena and counteract local fading at planning of wireless networks systems.

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