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Atmosphere refractivity is one of the most important parameters in the low frequency (LF) ground-wave propagation. It is predominantly horizontally stratified and time dependent. In this paper, the 2-D rotational symmetric moving window finite-difference time-domain algorithm is employed to investigate the impacts of different refractivity-height profiles on the field strength and time-delay of the...
In this paper, a conformal high-order finite difference time-domain (CHO-FDTD) scheme is present to deal with the dielectric curved objects. The general update equations of the CHO-FDTD have been derivated. The CHO-FDTD method, based on the effective dielectric constant EDC technique, is applied in scattering cases, and the conclusion are that the scheme provides the better accuracy than the HO-FDTD...
In this paper, using 100000 CPU cores, the parallel Finite Difference Time Domain (FDTD) algorithm based on MPI is firstly applied to analyze the radiation characteristic of a microstrip antenna array on the National Supercomputing Center in Jinan (NSCC-JN) successfully, which is a domestically-made supercomputer. And the parallel performance of the code is tested on it. The results show that the...
The scalar wave formulation of computation region and the first-order absorbing boundary condition are given by Maxwell's equations. Then the residuals of entire computation region are presented. The weak form solutions of wave equation are described by take integration over computation domain and its boundary. According to the principle of equivalence, the implementation of extrapolation from 2D...
A new method of the total-scattering field of Finite Element Time Domain (FETD) based on Newmark method to introduce plane wave is presented in this paper. And the scheme of far field extrapolation is given. Finally, the RCS of cylinder in TE case are computed by FETD method, and the results of MoM and FDTD method are given for comparison. The numerical results illustrate the feasibility and correctness...
In accordance with the ideas of sub-domain, we proposed a time domain iterative hybrid method based on the Finite Difference Time Domain (FTTD) and time domain physical optics theory (TDPO) according to electromagnetic scattering from electrically large conductor and local structures materials. The mutual coupling scattering between structures was analyzed and parallel collaborative research method...
A large number of numerical methods have been proposed and continue to be developed for solving electromagnetic structure problems. This paper presents a new look at these numerical methods and a way of unifying them with the node-based method of weighted residuals (MWR). As a result, a unifying approach to constructing of numerical methods is shown. It can then be applied to develop new numerical...
The transient response of the X-band microstrip antenna array illuminated by electromagnetic pulse(EMP) was calculated using FDTD and the proposed conductor edge of singularity solving technology which maintained the high accuracy without lower computation efficiency. The research results showed that the EMP can result in the enough high response voltage in coaxial line which may destroy components...
Research on time-domain responses characteristics of the broadband planar antenna illuminated by an in intentional electromagnetic pulses (EMP) is carried out in this paper. An efficient hybrid time-domain simulation method based on FDTD method combined with the c conformal technique is implanted for studying an EMP coupling with some typical broadband planar antennas widely used in the wireless communication...
The characteristic parameters of lightning electromagnetic pulse field (LEMP), such as peak values, time derivatives, power flow and energy density, are essential for LEMP shielding and remote sensing. In this paper, an novel approach based on finite difference time-domain (FDTD) method is demonstrated. For this new method avoids huge amount of storage when computing the distribution of LEMP in large...
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