Transient Field Of Electric Dipole In The Presence Of Three-layered Region

The studying of the analytical solution of the electromagnetic field in the three-layered re-gion can be traced back to the beginning of last century. During the second world war, the application of electromagnetic theory in stratified media has made a great importance, espe-cially in ocean submarine communications, underwater detection, oil exploration etc. Along with the fever for microstrip circuit miniaturization study recent years, the investigation for coated medium wave propagation excited by a electric dipole has gained a great attention. At the same time, transient electromagnetic field analysis has also become one of the hottest research branches. Therefore, in this article we proposed on the analytical solutions for transient wave in the presence of three-layered media. The main work and results are summarized as follows:1. Based on W. Y. Pan’s correction formula, we achieved the revised transient expressions in the integral form, which comprises the trapped surface wave term in wave vectors.2. Solved the transient wave by vertical electric dipole and horizontal electric dipole ex-citation, respectively, in the case of three-layered region. Firstly, we established the physical model in the condition of thin intermediate medium layer restriction in the prototype of a mi-crostrip circuit, the HF radiation mechanization in forest, and also the road overlayed by asphalt cement. Secondly, we obtained the approximate solution by theses models by virtue of similar approximation measures. Finally, we compared theses results with some existing results.3.Achieved numerical computations by the transient wave vector expressions we provided. Also analysised the electromagnetic vectors attenuation by the variance of transmission distances and dielectric parameters, respectively. Results show that the lateral wave and trapped surface wave decreases by time but with different attenuation rates.