The fifth generation (5G) of mobile communications networks is likely to use frequency bands in the millimetre-wave (mmWave) region, above 30 GHz. This band requires highly directional antennas to be used, implemented using planar antenna arrays with large numbers of elements to enable beamforming. However the cost of digital beamformers to drive all these elements is likely to be prohibitive, so hybrid digital/analogue beamforming is proposed, using passive analogue RF devices to provide control phase shifting and combining. There are also advantages in providing multiple arrays distributed over the service area, and jointly beamforming from several such arrays to serve a user terminal. This may also have advantages in simplifying the design of the hybrid beamformers as well as improving performance by reducing path loss. The project will investigate and develop this technology and evaluate overall network performance, largely using simulation and analysis, but it is possible that facilities to test the beamformers at RF may become available.