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This paper describes a modification of the unconditionally stable finite difference time domain (FDTD) algorithm based on the Associated Hermite (AH) functions. The original method is involved with solving a banded nested matrix equation to calculate the AH expanding coefficients using lower-upper (LU) decomposition, which is the main cost for CPU time and memory storage. Here, the calculation of...
The analysis of transmission line under non-uniform incident field and with nonlinear loads is discussed in this paper. A test system is established according to IEC 61000-4-24, which consists of fast pulse generator and SPD (Surge Protection Device) test fixture. By using this system, the nonlinear Volt-Ampere characteristics of SPD can be measured and the nonlinear model of SPD is established. The...
The EMP conductive susceptibility of a measurement and control device used in automatic management system is studied by experimental test. Two EMP waveforms with different rise time are applied to the devices. Responses of the EUT are measured and compared. The sensitivity thresholds of EUT are analyzed by statistical method. Results show the EMP with fast leading edge tends to cause more serious...
Aimed to acquire the screening efficiency of the shielded coaxial cable a time-domain measurement method is proposed and a test system based on the triaxial test fixture is designed. By using FFT, time-domain test result can be transformed in to frequency-domain. Comparison shows they fit well with each other. The proposed time-domain test method provides a more straight way to observe the screen...
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