See, C. H., Abd-Alhameed, R.  A., McEwan, N.  J., Jones, S. M. R., Asif, R., Excell, P.  S., "Design of a printed MIMO/diversity monopole antenna for future generation handheld devices: Design of a Printed MIMO/Diversity Monopole Antenna", International Journal of RF and Microwave Computer-Aided Engineering, 2014