Ultra-broadband microwave metamaterial absorber with tetramethylurea inclusion Zhang, Jiaqi ; Wu, Xiaoyu ; Liu, Liyuan ; Huang, Cheng ; Chen, Xieyu ; Tian, Zhen ; Ouyang, Chunmei ; Gu, Jianqiang ; Zhang, Xueqian ; He, Mingxia ; Han, Jiaguang ; Luo, Xiangang ; Zhang, Weili Abstract Publication: Optics Express Pub Date: September 2019 DOI: 10.1364/OE.27.025595 Bibcode: 2019OExpr..2725595Z