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Time domain partial wave based Euclid distance is presented for the optimization of TEM horn antenna. For the short pulse stimulated TEM horn antenna, the partial reflected waves in time domain can be related to the corresponding discontinuities. The normalized Euclid distance is then calculated from the partial reflected waves and the exciting pulse and used for the design and optimization pulse...
Time-domain broad-band antenna usually used for transmitting and receiving electromagnetic pulse signal. A miniaturization plate monopole broad-band ring antenna fed by coplane waveguide was proposed, through researching on the basic parameters that as sign of broad-band antenna's timedomain characteristic and analyzing the characteristic of microwave pulse time-domain test antenna, and this antenna...
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...
The pulsed eddy current nondestructive testing signal for ferromagnetic plate thickness testing is sensitive to the plate's thickness and probe lift-off effect simultaneously. This feature leads to the difficulty of eigen-value extraction in thickness quantification. To remove the probe lift-off effect, a method based on calculating the time-varied relative magnetic flux changing rate is presented...
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...
An improved Discontinuous Galerkin Time-Domain (DGTD) method based on regular hexahedron is proposed for reducing the computational complexity. The derivation process of the equations and calculation method is described. And the explicit scheme of DGTD Maxwell's curl equation based on regular hexahedron is given. By comparing with the general DGTD method, this method has a more simplified form and...
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...
In the design process of mixed-signal circuit, it is sometimes inevitable to meet partition of reference plane or slots on reference plane for the insulation of noise caused by different voltage level or IC's different noise susceptibility. This paper studies the undesired signal integrity problems caused by single-ended signal references on this kind of non-ideal ground plane. Firstly, a typical...
In this paper, a novel wideband harmonic phase reference (HPR) based on non-linear transmission line (NLTL) design is proposed. Aside from theoretical analysis, the additional characterization method, including the output spectra and timedomain signal, is performed as well. Due to the HPR is of great importance to NVNA, design of the HPR should be improved to extend the measurement bandwidth of NVNA,...
This paper describes a modeling method of the nonlinear response of receiver amplifiers based on high-order polynomials, using measured data of the amplifier 1dB compression point and the third-order intercept point to calculate the high-order polynomial coefficients. With the coefficients, a nonlinear disturbance response model is built for the amplifier. The model is then used in the research for...
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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