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Characteristics of a rectangular waveguide array with a frequency-selective shield of semielliptical shape with expansion of an operating band are investigated. It is shown that the region of transparency of the shield displaces down in a frequency in a comparison with the plane infinite frequency-selective surface (FSS). In this region the shield slightly changes the form of the main lobe of radiation pattern of an antenna array and increases far-out side lobes. Out of this region the shield reduces a backward specular scattering from an antenna, but increases a bistatic scattering.

This paper represents numerical and experimental studies of multimode waveguide Van-Atta array. It is shown that the use of multimode waveguides under certain conditions, allows to expand the angular sector of monostatic diagram of radar cross-section to the maximum possible value of ±45 0 relative to the normal to the plane of the array. Radiation pattern of the radiating elements in this case is equal to the radiation pattern of the Huygens element. Conducted research has shown good match between the numerical and experimental data.

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