The form of amatching transition is determined by the wave propagation equation for a rod of variable cross section and must correspond to a deep enough local minimum of the local (in a specified frequency band) mismatch factor. The fundamental system of solutions of this equation is used, so that it is possible to find the mismatch factor. Then, based on some initial approximation, the form of the transition is determined by means of the method of steepest descent. In the article, examples are considered which relate to the most interesting case of short transitions, to which a nonmonotone relation between the radius of the bar and the longitudinal coordinate corresponds.
Faculty of Physics, Moscow State University, Leninskie Gory, Moscow, 119992, Russia
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