AMC cells for broadband RCS reduction checkerboard surfaces

A new design approach on selection of AMC structures for designing broadband checkerboard surface is proposed. Using the same approach for checkerboard surface, two basic but properly designed AMC structures are used to achieve broadband RCS reduction, where phase difference of (180 ± 37)° is maintained from 3.6 GHz to 9.4 GHz. The RCS is reduced by more than 10 dB over an 83% fractional bandwidth (3.85-9.3 GHz). A prototype of the finitely sized (2 × 2) checkerboard was simulated and measured. The results show excellent agreement with the predictions.