Broadband backscattering reduction realized by array of lossy scatterers

Area of Science:

• Electromagnetics and Metamaterials
• Applied Physics
• Materials Science

Background:

• Backscattering reduction is crucial for stealth technologies and reducing electromagnetic interference.
• Existing methods often struggle to achieve broadband performance or are limited to specific frequency ranges.
• The integration of absorption and diffusion mechanisms is a promising approach for enhanced performance.

Purpose of the Study:

• To propose and demonstrate a novel array of lossy scatterers for broadband backscattering reduction.
• To combine absorption and diffusion functionalities within a single array for enhanced performance.
• To achieve significant backscattering reduction over a wide frequency range, including lower frequencies.

Main Methods:

• Design of an array composed of three subarrays utilizing ferromagnetic or dielectric scatterers.
• Incorporation of resistive octagonal rings as the fundamental scatterer unit.
• Experimental verification of the proposed array's backscattering reduction capabilities.

Main Results:

• The proposed array exhibits strong absorption across different frequency bands.
• The scatterers demonstrate varied reflection phases over a broad frequency spectrum.
• Achieved a -10 dB backscattering reduction from 3.15 to 18 GHz, covering a wide frequency range.

Conclusions:

• The developed array effectively reduces backscattering by combining absorption and diffusion.
• The design offers a new strategy for achieving broadband backscattering reduction, particularly at lower frequencies.
• Experimental validation confirms the theoretical predictions and practical applicability of the proposed method.