1. School of Electronic Science and Engineering, University of Electronic Science and Technology of China,National Key Laboratory of Science and Technology on Vacuum Electronics in Chengdu,Chengdu,China,611731
2. Nanjing Sanle Microwave Technology Development Co., Ltd.,Nanjing,China,211899
3. Beijing Vacuum Electronics Research Institute,National Key Laboratory of Science and Technology on Vacuum Electronics in Beijing,Beijing,China,100015