Transient Electromagnetic Response of a Coaxial Feeding Monopole Antenna Mounted on a Rectangular Metallic Enclosure Illuminated by Electromagnetic Pulses (EMP)

摘要

As we all know, coaxial cables are often used in the feed network of various antennas. In this paper, the terminal electromagnetic interference (EMI) responses of coaxial cables as a feed network of monopole antenna are studied, which is placed in an enclosure with a window on its wall and illuminated by an external pulse. The mathematical treatment is based on the finite-difference time-domain (FDTD) method combined with equivalent feed model method, Node's thin wire method, and two-step coupling method. The results obtained by our coupling method are compared with the direct telegraph equation coupling method, with good agreement achieved. Further, the proposed method is used to perform EMI transient analysis of the practical enclosure model illuminated by external pulses with different incident and polarization directions.