Cognitive radio means intelligent antenna, so for 5g antenna , antenna design consist of intelligent antenna. We can go for massive mimo. Antenna also have the capability of spectrum sensing. On 5g antenna deaign the main concept rely on to the concept of beam forming. You can also design antenna for low power smaet cells. Design millimeter wave antenna also known as 5g antenna. Also read the properties of millimeter waves
please read IEEE spectrum. follow this link.
https://spectrum.ieee.org/
https://spectrum.ieee.org/semiconductors/design/what-does-every-engineer-need-to-know-about-5g
https://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=8807152
CR technology is a type of spectrum sharing technique. It engage primary and secondary users with improved spectrum efficiency.The cognitive technology and 5G technology are considered to be future technology trend. The 5G technology uses mm wave and sub 6GHz spectrum.
You can check the frequency allocation bands for 5G. N port MIMO, where N=4, 8 can be used for designing the antenna for cognitive radio system for sub 6GHz band. Massive MIMO is also a design option.
Even you can go for MIMO Filtenna module, which will minimize RF circuitry part.
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