Dr. Kai Xu received his B.Sc. degree from the Taizhou Institute of Science and Technology, Jiangsu, China, in 2013, and his M.S. degree from Nantong University, China, in 2016. From 2015 to 2016, he served as a research assistant at the Institute for Infocomm Research in Singapore. He later pursued his Ph.D. in electromagnetic field and microwave technology at Nantong University. His research interests include microwave components, balanced microwave circuits, and integrated circuit design.