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A measurement of very fast transition durations due to gap discharge in air using distributed constant line system

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4 Author(s)
Kawamata, K. ; Dept. of Electr. Eng., Hachinohe Inst. of Technol., Japan ; Minegishi, S. ; Haga, A. ; Sato, R.

Very fast transition durations (rising time in positive polarity and falling time in negative polarity) due to starting of gap discharge were investigated in time domain. The gap space was set very small for voltages below 1500 V as a simulation of the charged device model (CDM) electrostatic discharge (ESD) and the gap discharge of switch devices. The measurement system consists of a distributed constant line system with a tapered coaxial electrode, which has a matched impedance for the characteristic impedance of the distributed constant line system. The insertion loss of the tapered coaxial electrode was within -3 dB in the frequency range below 4.5 GHz. The atmosphere around the electrode is ordinary air. This experimental system enables one to measure the high-speed transients of about 100 ps due to gap discharge in time domain. As a consequence of the experiment, the relationship between the discharge voltage and transition duration was confirmed. The voltage rise time was slowed down gradually in positive polarity, while the voltage fall time was slowed down remarkably in negative polarity for the 0.1-mm needle

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Electromagnetic Compatibility, IEEE Transactions on  (Volume:41 ,  Issue: 2 )