[en] The main problem of beam intensity limitation in modern accelerators and storage rings is the various types of instabilities. The method for calculation of a coupling impedance of periodic structures with quite general boundaries is developed. This technique is applicable at any frequencies and for arbitrary beam energy. It is especially convenient for short-period structures. To illustrate method potentialities longitudinal and transverse impedance of cyclic accelerator corrugated chamber in resonance region and at low frequencies for various beam energies are calculated. The comparison with results obtained by other methods in the regions of their applicability shows good agreement. 21 refs.; 6 figs