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This paper analyzed the bandwidth limit of a class of ultrathin metamaterial screens for reducing reflectivity. The screens consist of arrays of conducting strips or square patches on top of a planar lossy dielectric or magnetic substrate backed by a conducting ground plane. An accurate analytical model has been derived to calculate the reflection coefficients of the screens, which take into account accurately the high order modes between the array and the ground plane. Based on the analytical model, the maximum bandwidth of the screens was explained. The factors determining the maximum bandwidth of the screens were revealed, which can serve as guidelines for the design of the ultrathin metamaterial screens. [ABSTRACT FROM AUTHOR]

This paper presents a class of ultrathin metamaterial screens for microwave reflectivity reduction from metallic surfaces. The screens consist of a highly conductive sheet with periodic patterns on top of a thin grounded lossy substrate. The periodic patterns of the screens are composed of nonuniform patches. It is found that the considered screens exhibit about 60% larger working bandwidth than those with uniform patches. A simple analytical equivalent circuit is also derived for mechanism understanding and quick design for the screens. [ABSTRACT FROM AUTHOR]