Table 1 RCS reduction bandwidth for different incident angles.

From: Pixelated Checkerboard Metasurface for Ultra-Wideband Radar Cross Section Reduction

Incident Angle (θ) 10-dB RCS Reduction Fractional Bandwidth
TM-Polarization TE-Polarization
10° 88% 89%
20° 85% 60%
30° 82% 52%
40° 70% 30%