O.Y. Makarov, M.A. Romashchenko

Importance application of computer methods and computer aids for the decision tasks of electromagnetism and, in particular, for providing of an EMC did not cause doubts. Earlier already were necessity of knowledge are well-founded by the user bases of the theory field and antennas at usage software analysis of electromagnetic fields. This knowledge are necessary for formation model, but, still in a greater degree, for realization of an estimation and check of results. Long usage of software allowed the user in details the nobility it the strong and weaknesses, and also situations in which the result needed check by change of input parameters. Well waste procedures and physical conditions could be us to lead a tentative estimation of results or to plausibility check. These methods promoted increase of trust to receive results and plausibility of them. In article main principles of usage of the following methods was result: - method of power balance; method of reciprocity of the port parameters; global application of Ampere-s law; local application of Ampere-s law; method of vanishing tangential field; Satisfaction of mathematical and physical laws.