High-performance dendritic metamaterial absorber for broadband and near-meter wave radar

Absorbing materials in ultra-high-frequency (UHF) band has constantly been a major challenge. The size of the absorber in UHF band is large, whereas the resonant frequency band is narrow. According to Rozanov's theory, two kinds of composite metamaterial absorbers are designed to realize the requirements of low-frequency broadband metamaterial microwave absorber: the magnetic-metamaterial composite absorber1 and the dielectric-metamaterial composite absorber 2. In the range of approximately 300–1000 MHz, both absorbers achieve absorption of over 90% and feature good adaptability to the incident angle of the incident wave. The absorbers also present good absorption rate of over 80% in the range of 0°–45°. An absorber MA3 is designed with absorption frequency range of 1.08–4.03 GHz, and the experimental results are in good agreement with the simulation results. Processing samples of indium tin oxide resistance film and polymethacrylimide foam board features simple preparation and low cost, and the most important thing is to consider the weight problem, which features certain advantages in terms of use.