High-EMP effective bandwidth, measurement bandwidth and effect from rising time
The bandwidths of high-electromagnetic pulses generated by high altitude nuclear explosion, lightning and ESD have been investigated. In terms of the energy spectrums of the high-EMP and from the viewpoint of measurement validity, we have put forward two new concepts, energy effective bandwidth and dynamic range effective bandwidth, to represent the bandwidth of the high-EMP. Both of the effective bandwidths of the high-EMP specified in IEC61000-4-4, MIL-STD-464, IEC61312-1 and IEC61000-4-2, have been calculated,60 dB effective bandwidthes are separately 371 MHz, 786 MHz,1 233 MHz,96 kHz and 99% energy effective bandwidthes 46 MHz, 95 MHz, 183 MHz and 15 kHz. In addition, it has been known that the rising time of above high-EMP has a little impact on the two kinds of effective bandwidth, and it is neglectable within a certain range. At last, the measurement bandwidthes of above high-EMP are given,which are separately 152 MHz, 307 MHz, 916 MHz and 95 kHz.