1. Advanced Telecommunication Research Center (ATRC), Universiti Tun Hussein Onn Malaysia (UTHM), Batu Pahat, Johor, Malaysia
2. Faculty of Exact and Applied Science, University of N’Djamena, N’Djaména, Chad
3. Advanced RF and Microwave Research Group, Faculty of Electrical Engineering, Universiti Teknologi Malaysia (UTM), Skudai, Johor, Malaysia
4. Department of Electrical and Electronics Engineering, Abubakar Tafawa Balewa University, Bauchi, Nigeria