| Popis: |
Summary form only given. In this work we offer an alternative method to generate the powerful RF/HPM pulse in comparison to the idea presented by Baum et al. where the impulse like waveform of very short (100 ps) rise time generates the frequencies from 2 107 to 2 109 Hz . We have carried out computer simulations and experimental studies. The results show that the conventional Marx generators can also produce RF/HPM emissions. The main reason for the emissions is the consequential erection of the stages in the Marx generator. The theoretical model to be presented agrees well with the experiments and we have related this model to the operation of MCG as the RF/HPM device. In addition to the wideband spectrum, our systems can be made to radiate mainly at one of the following discrete frequencies such as 380 MHz, 520 MHz, 1.19 GHz, 1.45GHz etc. For example, when the stored energy in the Mini-Marx generator is 10 Joules, the radiated electric field exceeds 100 kV/m at a frequency of 1.19 GHz. The results obtained with several other Marx generators are presented. In the experiments on the energy compression, it was observed that the voltage induced by the exploding wire takes the shape of the Gaussian function with the rise time of 40-50 ns, the width of about 100 ns and the amplitude up to 700 kV. Such waveforms can also be obtained with the Marx generator. Using such slow generator, we demonstrate that the RF/HPM generation is a weak function of the rise-time. Here, the RF/HPM radiation is produced by a simple oscillatory circuit operating in air. |
