Dielectric-air structure located between ideal metal plates is analyzed. It is shown that efficient mechanical alteration of propagation constant in this structure could be achieved only for those modes with non-zero component of electrical field perpendicular to border between dielectric and air. Scattering problem for the structure was reduced by partial domain method to set of 1-rst type Fredholm integral equations for the unknown tangential components of electric and magnetic fields at the boundaries of partial domains. The set of integral equations was solved by method of moments.

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