Excitation of a horn radiator by the coaxial line connected to the radiator is considered. A finite electromagnetic pulse with the TEM structure propagates in the line. It is shown that cancellation of the symmetry of rotation about the Zaxis of the shape of the horn head results in the appearance at the Zaxis of the flow of the efficient electromagnetic radiation directed along this axis, which is caused by the conversion of the TEM mode into the modes with linear (near the Zaxis) polarization inside the horn. The possibility of control of the calculation accuracy and support of a high accuracy of calculation (which, for the considered examples, is about 0.1% in terms of the energy norm) is demonstrated.
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