Recent developments in both terrestrial and non-terrestrial networks are focused on multiple beam antenna systems to increase data rates and to provide more flexibility in resource allocation. Some synergies between space and terrestrial systems are emerging as the fifth-generation (5G) of wireless systems introduce millimeter-wave frequencies for short-range and indoor applications. This provides a unique opportunity for the transfer of technology, as requirements for satcom user terminals and cell tower antennas present some similarities. While phased array antennas are getting a great deal of attention, their cost still remains high for mass-market applications and alternative solutions based on simpler beamforming techniques are being considered. These solutions are also of interest in radar systems and microwave instruments combining high resolution and wide angular field of view. This talk will review well-known beamforming techniques, including Butler, Blass and Nolen matrices, and discuss their respective advantages and limitations. Recent developments, including a first demonstration of a planar array with a triangular lattice of beams, will be presented. The talk will also provide a discussion of current technology limitations and directions for future developments. Co-sponsored by: INRS, STARaCom Speaker(s): Nelson J. G. Fonseca , Virtual: https://events.vtools.ieee.org/m/288535