Comments on "Transient radiation of traveling-wave wire antennas

Wu and Ruan (see ibid., vol.41, p.120-23, 1999), based on the formalism of Podosenov, Svckis and Sokolov (1995), tried to calculate the electromagnetic radiation field from the current of a traveling wave propagating along a thin curvilinear wire with free ends. In this article the author tries to prove that in the paper of Wu et al. one problem was substituted by another. In fact, another problem, but not that which was formulated by the authors, was solved. It is not the problem of radiation from a curvilinear antenna of finite length, but the problem of radiation from part of an infinite antenna and two external sources emerging under a forcible requirement of satisfying the Lorentz condition for a subsystem, where this condition does not operate a fortiri. The proof is based on the following easily verifiable facts: (1) a coincidence of the expressions for the magnetic field; and (2) a dissimilarity of the expression for the electric field from the formula to a forcible imposing of the Lorentz condition being invalid for subsystems. The author comments on the second point in more detail.