The results of numerical electrodynamic modeling and experimental research of slotted waveguide radiator is presented. The operational frequency was decreased on 25%. It was found that the differences between the experimental and calculated characteristics are associated with the following factors: the inaccuracy of manufacture of the geometric dimensions of the slotted waveguide radiator, methodical error of the finite element method in calculating the characteristics, inaccuracy of the values of the relative permittivity and magnetic permeability.
The usage of impedance matching materials for millimeters waves in antenna systems is a promising direction in the development of modern radar stations that allows unifying nomenclature of radiating elements. One of possible appliances of impedance matching materials is transfer of working frequencies of radiating elements to bands with greater wavelength. The usage of several impedance matching mediums, for example, with ε<sub>r</sub>=μ<sub>r</sub>=2, ε<sub>r</sub>=μ<sub>r</sub>=4, ε<sub>r</sub>=μ<sub>r</sub>=8, ε<sub>r</sub>=μ<sub>r</sub>=10 allows to extend waveband of the radiating element by 2, 4, 8 and 10 times.