**6. Conclusions**

In the chapter, we explored and demonstrated the availability of using the phased array antennas, which were known for a long time in the radar technique, in the incoming fifth-generation wireless communication systems. The study was carried out using a specific example of designing a photonics-steered beamforming network (BFN) of a transmitting-phased array antenna for a remote station operating in the V-band with a 30% fractional bandwidth allocated in the USA as a promising one for future 5G systems. For this goal, we first reviewed the specialties of microwave and millimeter-wave photonics technique in 5G wireless networks of radio-over-fiber architecture. Then, to determine the input data for subsequent design, a theoretical background of array antenna beam steering using ideal models of phase shifters and true-time-delay lines was presented. A brief analysis of updated optical beamforming networks produced on optical fibers, Bragg gratings or photonics integrated circuits, showed the possibility and efficiency of constructing the delay elements required for the device being developed, on the basis of photonics integrated circuits. The developed models and executed simulation of two versions of photonics BFN based on known scheme including set of optical delay lines and a novel structurally and cost-efficient configuration using wavelength division multiplexing and TTD techniques demonstrated the advantages of the proposed scheme from the point of view of the simplicity, key figures of merit, size, weight, and power features.
