1. Applied Electromagnetics and Telecommunication Research Group Affiliated to the George Green Institute for Electromagnetics Research Nottingham UK
2. Department of Electrical and Electronic Engineering The University of Nottingham Malaysia Campus (UNMC) Jalan Broga 43500 Semeniyh Selangor Malaysia
3. Faculty of Electrical Engineering Czech Technical University in Prague Technicka 2 166 27 Prague Czech Republic
4. Department of Electrical Engineering California Polytechnic State University CA USA