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The paper analyzes the methods of determining the electromagnetic fields in waveguide-slot structures with dielectric insertions. In a rigorous formulation of the problem cases of single slots and multi-slot systems are analyzed. The elongated dielectric insertions s (in the form of infinitely long layers) and local ones (a “plug” of finite length which completely covers the cross-section of the waveguide) as well as the dielectric inserts partially filling the narrow slots are considered. Particular attention is paid to the definition of the field excited by a magnetic current. A possibility of solving the excitation problem by means of expanding the unknown fields in terms of waveguide eigen waves is discussed. Some results of the calculations are presented.

electromagnetic field; slot; magnetic current; radiation coefficient