Houjun Sun is a professor and director at the Institute of Beijing Institute of Technology Microwave Technology. He received his PhD in Engineering at the Beijing Institute of Technology Communication and electronic systems in 1997, and from November 1997 to November 2000, he worked at the Beijing Institute of Technology Weapons and science and technology post-doctoral mobile station. Since December 2000 he has been engaged in teaching and scientific research at the Beijing Institute of Technology. His disciplines include electromagnetic field and microwave technology, with a research direction focused on microwave/millimeter-wave circuits and systems.