The hybrid metal dielectric structure which is combined a microstrip line section and bounded periodical sequence of slot discontinuities are investigated. The boundary problem for a single discontinuity is solved with the help of spectral-domain approach. For the definition of the parameters of bounded sequences of discontinuities the operator technique is used. If one introduces the slot discontinuity into the T-wave propagation region one can observed the phenomena of leaky modes excitation

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... round the cut-off frequencies of microstrip line is established, They may be classified as surface-wave leaky modes and space-wave leaky modes. The excitation efficiency dependence by the couple value of the discontinuity and basic waveguide is investigated.