Abstract
The transmission line matrix time domain (TLM-TD) method is used to simulate the electromagnetic pulse (EMP) cou-pled inside a shielding box with an aperture. Simulations for different electromagnetic pulses regarding to different rise time and fall time have been performed. The results for shielding effectiveness of these different excitations have been presented. A simple method that uses an extra metal for reducing the interference has also been proposed and tested.
Highlights
In the recent years by developing the electronic technology, the integrated level of the circuits has been increased and its working voltage is getting lower and lower, which increases the sensitivity of the circuit to electromagnetic interference (EMI) and requires more considerations for making environmental compatibility.Electromagnetic pulse recently has been attracted more attention as an EMI source
Sensitive electronic apparatus and circuits are usually shielded against the external interference electromagnetic pulse (EMP) with a metal shielding box
The electronic apparatus and circuits inside a metal shielding box are affected by EMP mainly through two alternatives
Summary
In the recent years by developing the electronic technology, the integrated level of the circuits has been increased and its working voltage is getting lower and lower, which increases the sensitivity of the circuit to electromagnetic interference (EMI) and requires more considerations for making environmental compatibility. In [1] a Method of Moment/ Finite Difference Time Domain (MOM /FDTD) hybrid algorithm is used to calculate the Electromagnetic pulse coupling with a complicated shielding box. In [4] the Transmission Line Matrix (TLM) method has been developed for the electromagnetic compatibility (EMC) analysis of circuits and equipment packaging. In [5], a novel time-domain wave propagator, based on the transmission line matrix (TLM) technique, is introduced. In [6] the time- and frequency-domain transmission line matrix methods have been developed and shown to be effective and powerful in solving electromagnetic problems. Symmetrical Condensed Node (SCN) of TLM-Time Domain method is used to simulate the coupled electric field of EMP inside a shielding box with a rectangular aperture. Results show that rise time and fall time of electromagnetic pulse has a significant effect on coupled energy into the box
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