Mohamed Sanad and  Noha Hassan,  Reducing the Need for Multi-Input Multi-Output in Multi-Beam Base Transceiver Station Antennas Using Orthogonally-Polarized Feeds with an Arbitrary Number of Ports.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2021, vol. 176(8). 335 - 339
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10012192.