Li Yu-Han, Deng Lian-Wen, Luo Heng, He Long-Hui, He Jun, Xu Yun-Chao, Huang Sheng-Xiang. Equivalent circuit model and microwave reflection loss mechanism of double-layer spiral-ring metasurface embedded composite microwave absorberJ. Acta Physica Sinica, 2019, 68(9): 095201. DOI: 10.7498/aps.68.20181960