Equivalent circuits of transmission lines sag above lossy ground excited by external electromagnetic fields

Abstract

To obtain actual responses of nonlinear terminations for the transmission lines sag above lossy ground, it imperatively need to build the equivalent circuits of transmission lines sag. In this paper, the multi-conductor transmission lines sag above lossy ground are divided into a sequence of smaller segments, each of which is approximate equal height. Equivalent circuit of the transmission lines sag is composed of each segment in series. And the simplified equivalent circuit of transmission lines sag above lossy ground excited by the external electromagnetic fields is built by combined the neighboring elements. The proposed method is compared with the result obtained by the FDTD method, a good agreement is observed. And the amplitude of the response is less than the results when the transmission lines are considered as the straight lines.