Research On Time-domain Hybrid Algorithm For Electromagnetic Wave Propagation And Scattering

Nowadays,the bandwidth of the device has been broadened and the operating frequency has been increased.Considering the influence of the electrically large platform,it brings much difficulty in analyzing the electromagnetic property of the device.Meanwhile,under the increasingly complex electromagnetic environment,simulation of electromagnetic compatibility between devices and the platform or large objects nearby is necessary.Many popular numerical solutions such as Mo M or FDTD,which is referred in this paper,can achieve accurate solutions.However,most of them lack in solving problems of target with electrically large size due to limit of CPU or other external factors.And some high-frequency asymptotic methods such as physical optics(PO),or other asymptotic technique such as parabolic equation(PE)method,are good at solving these problems but lack of accuracy.In this paper,two different hybrid methods are proposed to provide access to solving multi-scale composite targets' electromagnetic characteristics.A FDTD/PE hybrid method is introduced for prediction of radio wave's propagation in large scenes with refined structure.Then a FDTD/PO hybird method is introduced to analyze the farfield transient response while radiation source is located near large platforms.In the following words,the algorithms involved in the two hybrid method will be introduced respectively;and the coupling technologies of the two hybrid algorithms on the interface will be introduced in detail.Finally,as an extension,an acceleration technology based on Taylor series expansion will be applied to the FDTD/PO hybrid algorithm to further save the time cost of the hybrid algorithm.