1. Faculty of Electrical Engineering, Universiti Teknologi MARA Cawangan Pulau Pinang, 13500, Permatang Pauh, Penang, Malaysia
2. Department of Applied Science, Universiti Teknologi MARA Cawangan Pulau Pinang, 13500, Permatang Pauh, Penang, Malaysia
3. School of Physics, Universiti Sains Malaysia, Pulau Pinang, Malaysia