1. Department of Electrical and Electronics Engineering, College of Technology, The University of Bamenda, Bambili P.O. Box 39, Cameroon
2. Department of Electrical and Electronics Engineering, College of Technology (COT), University of Buea, Buea P.O. Box 63, Cameroon
3. Department of Electrical and Power Engineering, Higher Technical Teacher Training College, HTTTC, The University of Bamenda, Bambili P.O. Box 39, Cameroon
4. Unit of Condensed Matter Research, Electronics and Signal Processing, LAMACET, Faculty of Science, Department of Physics, University of Dschang, Dschang P.O. Box 67, Cameroon