Jalal Khan and  Daniyal Ali Sehrai and  Shakeel Ahmad,  Design and Performance Comparison of Metamaterial Based Antenna for 4G/5G Mobile Devices.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    April 2018, vol. 138(6). 382 - 387
    [viewed 04 April 2020]. Available from: https://publications.waset.org/pdf/10009045.