1. State Key Laboratory of Complex Electromagnetic Environment Effects on Electronics and Information System (CEMEE), Luoyang 471003, China
2. National Key Laboratory of Science and Technology on Vacuum Electronics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, China
3. College of Computer Science and Technology, Southwest University for Nationalities, Chengdu 610041, China
4. Southwest Institute of Electronic Technique, Chengdu 610000, China
5. Department of mechanical and electrical engineering, Nanyang Technician College, Nanyang 473000, China