ABSTRACT
Such analyses predict the existence of two dominant modes that seem to explain the basic propagation mechanisms quite successfully [30-36]. In other words, a buried LCC can support two transverse electromagnetic (TEM)-like modes (see definitions in Chapters 6 through 9). The first one (called bifilar) is the perturbed transmission line mode, which is referred to as the internal mode. The main part of its energy is confined under the cable shield, but with some leakage outside it. As long as this leakage remains weak, the power dissipated into the earth remains small, and the specific attenuation does not differ much from that of a well-shielded coaxial cable with the same characteristics.
