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Electromagnetic wave scattering suppression has applications in many scenes, including radio communication and electromagnetic compatibility. A large amount of research focuses on absorber structures with reflection suppression at the −10 dB level, while scattering suppression beyond −10 dB level is rather rare. In order to study the formation of higher suppression, metamaterial with absorption and scattering composite function is presented based on the coding sequence of absorptive electromagnetic genetic components. The quantized experimental measurement result of scattering suppression reaches −22.4 dB in consecutive 7.152–16.184 GHz band (relative bandwidth 77.4%), which shows a consistent trend with simulation and validates the design process. Optimization with a small gene coding variation rate (4.7%) makes the scattering suppression effect surpass −30 dB line in 9.45–13.8 GHz in simulation. Besides camouflage function, this metamaterial could alter the scattering information in spatial distribution with a high suppression effect, which has a good chance to serve as a transmitter in a local area network with good privacy. [ABSTRACT FROM AUTHOR]

A resistive metasurface featured by the Rossler chaos reaction-diffusion system patterns is proposed and realized in a wideband electromagnetic absorber. The chaos surface consists of units with both random shapes and dimensions. Simulation results show absorption phenomenon, and correlation function analysis indicates new wave-absorbing mode can be generated when correlation of the edges of the chaos patterns matches geometrical size of chaos units. Experimental results indicate unconventional bandwidth ratio with reflectivity lower than –10, –15, and –19 dB reaches 96.84%, 80.1%, and 56.1%, respectively. A high-absorption nature makes this structure have application potential in a modern anechoic chamber or other electromagnetic wave absorbers. [ABSTRACT FROM AUTHOR]