1. Instituto de Telecomunicações; Aveiro Portugal
2. School of Information Technology & Communications; American University of Nigeria; Yola Adamawa Nigeria
3. Radio Frequency; Antennas; Propagation and Computational Electromagnetics Research Group; School of Electrical Engineering and Computer Sciences; University of Bradford; Bradford BD7 1DP United Kingdom
4. Engineering; Sport and Science (ESS) Academic Group; University of Bolton; Bolton BL3 5AB United Kingdom
5. Department of Engineering and Applied Physics; Glyndwr University; Wrexham Wales United Kingdom
6. The department of Electronics; Telecommunications and informatics; Universidade de Aveiro; Portugal