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Suppression of the Time‐Domain Sputtering Effect Using Low‐Scattering Metasurfaces

Recently, the time‐domain sputtering effect has been discovered when the low‐scattering objects (LSOs) are illuminated by radar pulse signals. It results in large and sharp peaks at the beginning and end of the reflected waveforms, and presents a great challenge for them in stealth applications. To tackle that problem, herein, the sputtering effect of LSOs is explained using the Fourier transform, and the main factors influencing the effect are analyzed. A method is proposed based on the analysis to suppress the sputtering effect of LSOs by increasing their low‐scattering bandwidths (LSBs) and reducing their out‐of‐band reflectance (OOBR). Two absorbing metasurfaces with different LSBs and OOBR as samples to verify the effectiveness of this method are fabricated. The time‐domain reflected waveforms of the two samples are simulated and measured, and the corresponding sputtering effects are compared. Both simulation and measurement results reveal that the sputtering effect can be significantly suppressed by increasing the LSB and reducing the OOBR of the LSOs.