Research progress on wave-absorbing mechanism of electromagnetic materials and low-frequency thin-layer wave-absorbing materials

With the rapid development of microwave emission and detection technologies and the high integration of high-frequency electronic devices, efficient wave-absorbing materials can not only effectively weak microwave reflection signals to prevent the target from being detected, but also inhibit electromagnetic interference between high-frequency devices for electromagnetic compatibility. In recent years, domestic and foreign researchers have done a lot of research work on different material systems and microstructure reconfiguration for the development of thin-layered and efficient wave-absorbing materials. Due to the lack of in-depth understanding of the wave-absorbing mechanism of the absorbers, the research on thin-layer wave-absorbing materials has not made significant progress. Starting from exploring and clarifying the source of absorption peaks, our team reveals the physical mechanism of absorption peak generation by designing experiments combined with theoretical calculations, and further reveals the physical images of intensity change, impedance matching, and bandwidth of absorption peaks. Based on the wave-absorbing mechanism, our team has proposed the evaluation standard for the performance of wave-absorbing materials, and developed a new type of easy-plane magnetic wave-absorbing material. Important breakthroughs have been made in the development of thin-layer, especially low-frequency thin-layer wave-absorbing materials. For metamaterial wave absorbers, which have recently attracted attention in academia, the absorption mechanism proposed by our team is also fully applicable in explaining the generation of absorption peaks and expanding the absorption frequency band, providing effective guidance for the development of structural types of wave absorbers with better performance.