1. School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA, Dungun, Malaysia
2. School of Electrical Engineering, College of Engineering, Universiti Teknologi MARA, Shah Alam, Malaysia
3. Department of Electrical Engineering, Faculty of Engineering, University of Malaya, Kuala Lumpur, Malaysia
4. Faculty of Advanced Technology and Multidiscipline, Airlangga University, Surabaya, Indonesia
5. Department of Physics, Faculty of Science, Airlangga University, Surabaya, Indonesia