| Electromagnetic radiation and scattering problems of thin wire structures in the presence of perfect conducting ground or dissipative medium are investigated in the time domain directly in this thesis. Time domain electric field integral equation (TD-EFIE) denoted by vector potential of single thin wire radiating above dissipative half-space is proposed via image theory and time domain reflection coefficient method, where the affection of the lossy medium is presented by the space-time Fresnel reflection coefficient in the integral kernel. Equations of two coupling wires or buried wire in different medium situations are expanded from equations of single wire conductor and solved efficiently by TD-MOM combined with MOT procedure. Results are agreeable with data from references and NEC software, as well as experimentation in the three-meter compact anechoic chamber. Overhead and buried transmission lines are modeled precisely via scattering theory of antenna, affection to their transient responses from lossy medium are analyzed, which can provide some guidance for engineering.
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