Electromagnetic fields of impulse sources and nano-oscillators in homogeneous, layered, and nonlinear media.
Dumin Oleksandr M.,
V.N. Karazin Kharkiv National University
Using the method of evolution equations, the interaction of pulse fields with a nonlinear medium inside the lens antenna is investigated. The combination of numerical method of calculation of the linear part of the problem and analytical calculation of the parameters of additional pulse sources caused by nonlinearity, which are further used as new sources that generate additional to the linear field, is used.
Using numerical methods in time domain, the characteristic transformations of pulse fields due to their interaction with metallic and dielectric inclusions in irradiated media were obtained. The obtained time shapes of field are used to search for hidden inclusions by processing with an artificial neural network. A similar approach to the analysis of fields is used to build a positioning system on short-pulse waves, based on a weak change in their time form due to changing the angle of radiation of the antenna. The efficiency of signal processing by the artificial neural network in comparison with the traditional correlation approach is also compared on this problem. The numerical simulation of a single oscillator on a nonlinear magnetic nanostructure with the additional external resonant circuit to improve the generation of high-frequency current components is carried out. Analytical solutions in time domain for non-stationary fields at the boundary of two media are obtained. The use of artificial neural networks for detecting landmines using pulse radar is investigated.
The carried out research is valuable for the construction of powerful pulse radiators of electromagnetic field, means of detecting hidden explosive objects, positioning systems of the new type in pronciple and nanogenerators of millimeter range.