Wideband Rogowski coil based on low resistance integrating resistor

Air coil self-integrating Rogowski coil is suitable for measurement of large amplitude pulsed current in pulsed power system. However, it is hard to use only one coil to measure pulsed currents with risetime from sub-microsecond to millisecond precisely. Some researchers used a coil with small number of turns to response fast pulsed current¹. While other researchers used multilayer wire or new structures to increase the number of turns (self-inductance), aiming to get a better low frequency response². It seems like that a coil can´t have a good response from ~1 kHz to ~10 MHz.