| Since the World War ?, the electromagnetic field in layered media has been investigated widely because of its useful application in submarine communication, seabed detection, oil exploration, microwave circuit and so on. Compared with frequency-domain field in layered media that has been widely researched, it is hard to obtain the analytic expression of the frequency-domain field. This thesis attempts to study the transient field excited by a horizontal electric dipole over the perfect conductor coated by an anisotropic (uniaxial) medium. The main works in this thesis are included as the following three respects:First, the introduction is carried out for the background and the applications of frequency domain and time domain in the layered medium. Especially, the available analytic expression is elaborated of a horizontal electric dipole near the planar surface of a perfect conductor coated with a uniaxial layer.Second, based on the above analytic results on the frequency-domain field, the analytic solution is obtained for the time-domain electromagnetic field generated by a horizontal electric dipole near the planar surface of a perfect conductor coated with a uniaxial layer. It is noted that the analytic solution of the time-domain field for the directed-wave term, the idealized-reflected-wave term, the lateral-wave term, and the trapped-surface-wave term are provided in this thesis. Also, the corresponding numerical simulations are presented. At last, the obtained numerical results are compared with the available results, and the summary is carried out.Third, for the microstrip circuit structure, which a perfect conductor is coated by an anisotropic (uniaxial) medium, considering that the distance between the field point and the source point is not far compared with the operating wavelength, the numerical results are given for the near field.The thesis is concluded with main works, limitations and prospects for further investigation. |
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