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To reduce the electromagnetic radiation, we set a metal layer to surround lightning rod for shielding. Then we use the finite-difference time-domain (FDTD) method to analyze the field distribution laws of this situation. Moreover, we also calculate the corresponding field distribution without metal layer for comparison. It is shown that the metal layer affects the electromagnetic field distribution...
The shielding effectiveness (SE) test is usually implemented in the bounded-wave simulator. However, numerical simulating the SE of a shielding enclosure is mostly modeled with plane wave incidence. In this paper we present the parallel FDTD method to analyze the SE of a shielding enclosure in bounded-wave simulator. An improved formalism for thin slot is adopted. The result shows that the result...
New finite-difference time-domain (FDTD) update equations for long thin wire are presented. The axis of long thin wire is assumed to be diagonal to the Yee cell faces. Derived using the contour-path method, the new equations properly models the singular field near the long thin wire. A dramatic improvement in computed accuracy was observed when a stripline with long thin wire diagonal to the Yee cell...
The predigested physical model is set up in this paper according to the geometry shape of the earthing electrode, and the finite-difference time-domain (FDTD) method is used to get the transient grounding resistance (TGR) waveform of the earthing electrode, based on the experimental method. It is showed that the calculation results and the experimental results match well.
The total-field/scattered-field (TF/SF) formulation for ADI-BOR-FDTD method is presented. The equation modification for field components neighbouring the TF/SF boundary are given in details. To validate the implementation of the method, the backscatter RCS from a PEC sphere is calculated. Compared with theoretical result, they show good agreement.
Due to a nearby lightning return stroke, the coupled electromagnetic (EM) fields inside a rectangular shielding enclosure, on the finitely conducting ground, with an aperture in one wall are calculated numerically by using the finite-difference time-domain (FDTD) method. First, the near fields generated by the return stroke are obtained in two-dimensional (2-D) cylindrical coordinates by the FDTD...
Aimed to solve the time-domain convolution in the analysis of transmission line coupling problems, a digital filtering method is proposed to be used in the one-dimensional FDTD computations. Discrete transfer function that represents features of ground impedance is applied to simplify the convolution. Examples demonstrate that the method is effective when the conductivity of the soil is between 10...
A modified Liao's second-order absorbing boundary condition (ABC) is presented in this paper. With the modification, the proposed Liao's ABC can be stabilized even after several ten thousand time steps. This is useful in finite-difference time-domain (FDTD) simulations for a significant period of time. Numerical examples show the effectiveness of the introduced ABC
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