Institute of Materials for Energy and Environment;
State Key Laboratory of Bio-fibers and Eco-textiles;
College of Materials Science and Engineering;
Qingdao University;
Qingdao 266071;
China;
Key Laboratory of Engineering Dielectrics and Its Application;
Ministry of Education;
School of Electrical&Electronic Engineering;
Harbin University of Science and Technology;
Harbin 150080;
China;
Manganese oxide/carbon composites; Dielectric loss; Relaxation time; Electromagnetic wave absorption;