Broadband microwave metamaterial absorber with lumped resistor loading Ke Chen, Xinyao Luo, Guowen Ding, Junming Zhao, Yijun Feng and Tian Jiang EPJ Appl. Metamat., 6 (2019) 1 Published online: 16 January 2019 DOI: 10.1051/epjam/2018011