Kangfu Liu has received the B.S. degree from the Xidian University in 2018 with a major in Microelectronics Engineering. From 2017/11 to 2018/5, he learned with Prof. Junrui Liang about vibration energy harvesting circuit as a visiting student. He joined ShanghaiTech University as a graduate student (in collaboration with Prof. Junrui Liang). His current research interest is on RF piezoelectric resonator and energy harvesting devices.