5G systems are being developed to meet the ever increasing desire for additional data bandwidth in mobile devices. Two enabling technologies for these systems are millimeter-wave electronics and phased arrays. Phased arrays have traditionally been used on military radar and satellite systems. However, they provide the capability to direct communication antenna beams directly to users or groups of users. In fact, standards committees agree that all network elements (including base stations, Access Points, and User Equipment) will be equipped with directional steerable antennas and can direct their beams in specific directions. In other words, phased arrays will be deployed at a variety of points in the 5G system even down to user equipment such as mobile phones, tablets, and lap tops. However, the components and modules used in 5G systems come with their unique packaging challenges. Those challenges will be described and some solutions will be given. 5G systems alternatives will also be described based on several architectures that are available for phased arrays. The two main reasons they are a challenge to package will be described. Several alternative solutions including heterogeneous packaging and 3D integration are described.

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