Negative permittivity derived from inductive characteristic in percolating copper/epoxy resin metacomposites

Negative permittivity derived from inductive characteristic in percolating copper/epoxy resin metacomposites Kai Sun , Jiahao Xin , Yaping Li , Zhongyang Wang 2, , Qing Hou *, Xiaofeng Li , Xinfeng Wu , Runhua Fan 1, *, Kwang Leong Choy * College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai 201306, China 2 Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials (Ministry of Education), Shandong University, Jinan 250061, China 3 Department of Materials Science and Engineering, National University of Singapore, Singapore 119077, Singapore 4 Department of Chemistry,University College London, London WC1H 0AJ, UK. 5 UCL Institute for Materials Discovery, University College London, London WC1E 7JE, UK. * Corresponding author.