Broadband backscattering reduction realized by array of lossy scatterers

We propose an army of randomly distributed lossy scatterers to achieve broadband backscattering reduction. The army efficiently combines absorption and diffusion functionalities by using three subarrays made of ferromagnetic or dielectric scatterers based on resistive octagonal rings. The subarrays have strong absorption in different frequency bands, whereas they have different reflection phases in a wide frequency band, resulting in -10 dB backscattering reduction in a wide frequency range (from 3.15 to 18 GHz). The results are verified by experiments. Our work provides a new way to reduce backscattering in a wider frequency range and at lower frequencies. (C) 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement