1. Institute of Research and Development, Duy Tan University; K7/25 Quang Trung Danang Vietnam
2. Institute of Physics, Vietnam Academy of Science and Technology; 18 Hoang Quoc Viet, Cau Giay Hanoi Vietnam
3. School of Electrical Engineering, Hanoi University of Science and Technology; 1 Dai Co Viet, Hai Ba Trung Hanoi Vietnam