1. High-Power Radiation Laboratory, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, China
2. School of Electronic Science and Engineering, University of Electronic Science and Technology of China (UESTC), Chengdu, China
3. Department of Electrical and Computer Engineering, University of Calgary, Calgary, Canada
4. 9th Research Institute of China Electronics Technology Group Corporation, Mianyang, China