Fields radiated by electrostatic discharges

Wilson, Perry F.; Ma, Mengyao

doi:10.1109/15.68245

Cited by 154 publications

(24 citation statements)

References 3 publications

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“…Lot of effort has gone into the study of ESD current waveforms in order to develop discharge simulators for simplifying and standardizing ESD susceptibility testing [1, 2,3]. The radiated fields associated with ESD events [4] have received much less attention compared to conducted susceptibility [5,6]. This paper predicts the ESD response of the front end of the radio frequency subsystems working in Very High frequency (VHF) band.…”

Section: Introductionmentioning

confidence: 99%

Mathematical analysis of ESD generated EM radiated fields on electronic subsystem

Narendra¹,

Sudheer²,

Jithesh³

et al. 2010

2010 Asia-Pacific International Symposium on Electromagnetic Compatibility

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Section: Introductionmentioning

confidence: 99%

Mathematical analysis of ESD generated EM radiated fields on electronic subsystem

Narendra¹,

Sudheer²,

Jithesh³

et al. 2010

2010 Asia-Pacific International Symposium on Electromagnetic Compatibility

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“…It is necessary to establish the full-wave modeling of the electromagnetic system, in order to accurately account for the electromagnetic phenomena such as propagation, dispersion, resonance, reflection, coupling, radiation, and crosstalk. Because of its computational efficiency, accuracy and direct physical interpretations, the FDTD method has become very popular to model a wide variety of electromagnetic wave problems [1][2][3]. The FDTD method dates back to 1966 with the work of Yee [4] and provides a direct solution in the time domain of Maxwell's curl equations for isotropic, nondispersive media.…”

Section: Introductionmentioning

confidence: 99%

“…Because of its computational efficiency, accuracy and direct physical interpretations, the FDTD method has become very popular to model a wide variety of electromagnetic wave problems [1][2][3]. The FDTD method dates back to 1966 with the work of Yee [4] and provides a direct solution in the time domain of Maxwell's curl equations for isotropic, nondispersive media. The FDTD algorithm was later combined with accurate absorbing boundary conditions proposed by Mur in 1981 to yield a robust and computationally efficient means to calculate EM wave interactions with arbitrary structures.…”

Section: Introductionmentioning

confidence: 99%

“…It can cause permanent damage and signal errors to high-speed electronic circuitries. When ESD is directly discharged on the metallic plane, a large magnitude of radiated field will be generated [2][3][4]. For physical protection in practice as well as EMI shielding purposes, a metallic enclosure is normally used to cover the internal circuitries of the electronic products.…”

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confidence: 99%

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Effect of ESD injection locations on induced noise inside a shielded enclosure

Chan

Fung

Leung

2003

Micro & Optical Tech Letters

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Electrostatic discharge (ESD) on the metallic enclosure of electronic products normally generates unwanted radiated electromagnetic interference (EMI). INTRODUCTIONESD is a transfer of electric charges between bodies of different electrostatic potential in proximity or through direct contact [1]. It can cause permanent damage and signal errors to high-speed electronic circuitries. When ESD is directly discharged on the metallic plane, a large magnitude of radiated field will be generated [2][3][4]. For physical protection in practice as well as EMI shielding purposes, a metallic enclosure is normally used to cover the internal circuitries of the electronic products. However, an aperture created on the metallic enclosure for heat dissipation or cable connection, would usually degrade the overall shielding effectiveness.ESD current diffusion and EM field radiation on the metallic enclosure were carried out by Angeli et al. by using the finitedifference (FD) method in both the time domain and the frequency domain [5][6]. ESD field penetration into an enclosure through slots has also discussed by Cerri et al. [7][8][9][10]. The ESD indirect coupling mechanism was studied by using an analytical approach based on the classical electromagnetic theory [11]. The abovementioned references of previous research found good agreement between the various experimental and mathematical models and their results indicated that the noise coupled into the metallic enclosure was significant. In this paper, we study the noise level induced within a metallic enclosure due to: (i) different aperture lengths on the metallic enclosure, and (ii) different injection locations of ESD on a metallic enclosure with an aperture by using an experimental approach. GEOMETRY OF THE METALLIC ENCLOSURE OF THE MEASUREMENTThe configuration of the metallic enclosure in our study is shown in Figure 1. A 3-mm-thick aluminum (Al) metallic enclosure with a dimension of 20 cm ϫ 30 cm ϫ 50 cm, which is the typical size of computer casing, is used in the analysis of this paper. There is an aperture on the enclosure representing the common slot opening on the casing. To simplify our analysis, the aperture is placed only on one of the plane of the metallic enclosure. A 4 cm ϫ 4 cm square loop is also placed inside the metallic enclosure at point X to pick up the induced noise voltage level inside the enclosure. MEASUREMENT SETUPThe arrangement of the measurement set-up is shown in Figure 2.To provide an environment that is free from all external EM noise, all the measurements are carried out inside an anechoic chamber. A digital oscilloscope and an attenuator are placed outside the chamber in order to avoid the unwanted triggers caused due to the high level of EM field generated by the ESD current. A commercial ESD-simulator, KeyTak model MINIZAP MZ-15/EC, is used to generate the required electrostatic discharge in our measurement. A typical ESD current is injected into the metallic enclosure at point S. This is to model the situation of a person touch...

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“…Various analytic studies have been made [5][6][7] of the electromagnetic fields generated by ESD. However, these studies are based on the actually measured waveform or a model waveform of the ESD current, and do not lead to an understanding of the above phenomenon inherent to ESD.…”

Section: Introductionmentioning

confidence: 99%

FDTD computation of electromagnetic fields caused by electrostatic discharge between charged metal spheres

Fujiwara

Okuda

Fukunaga

et al. 2003

Electron. Comm. Jpn. Pt. I

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SUMMARYIn a discharge between charged metal spheres, the effect of the metal spheres on the generated electromagnetic field has not been clearly indicated. One of the authors (Fujiwara) has proposed the following computation method (called the image dipole method) for a spark discharge between metal spheres. The surface of the metal sphere is replaced by an infinite number of image charge pairs, which are arranged so that the surface is kept at the same potential. Then, the generated electromagnetic field is calculated analytically by superposition of the dipole fields caused by the spark current derived from the Rompe-Weizel sparkresistance law. It has been shown by the analysis that the metal sphere increases the field level. Then, the electromagnetic field generated by the spark discharge between metal spheres is calculated numerically by the finite-difference time-domain (FDTD) method, with the spark current as an excitation source for the metal sphere. The validity of the approach has been shown through comparison to the analytic solution by the image dipole method for the magnetic field waveform. However, the above computation method has the problem that the static electric field before the onset of the discharge cannot be calculated, which makes it difficult to understand fully the ESD field produced by the charged metal bodies. In this paper, the generated electromagnetic field is calculated by the FDTD method (voltage source method), with the spark voltage derived from the spark-resistor law as an excitation source. The result is compared to the results of calculations by the image dipole method and the current source method. It is shown that the waveform of the electrostatic field cannot be calculated by the current source method, but the voltage source method can calculate the field as in the case of the image dipole method. It is also seen that the magnetic field waveforms obtained by any calculation almost completely agree. The magnetic field waveform generated in the discharge experiment between metal spheres is observed by using a shielded magnetic field probe and a wideband oscilloscope (bandwidth 1.5 GHz), and is shown to agree almost completely with the results of calculations by the voltage source method and the image dipole method.

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Fields radiated by electrostatic discharges

Cited by 154 publications

References 3 publications

Mathematical analysis of ESD generated EM radiated fields on electronic subsystem

Mathematical analysis of ESD generated EM radiated fields on electronic subsystem

Effect of ESD injection locations on induced noise inside a shielded enclosure

FDTD computation of electromagnetic fields caused by electrostatic discharge between charged metal spheres

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