**6. Conclusions**

In this chapter, we summary recently mm-wave arrays for mobile phones. For broadside mm-wave array, the state-of-the-art single-band, dual-band, and reconfigurable designs are proposed in small size, low cost, and have moderate performance. For endfire array, the typical designs of horizontal-polarized, vertical-polarized, and dual-polarized arrays are analyzed, providing good reference solutions for endfire array design. For co-design of mm-wave array in the mobile phone, several ingenious solutions and practical solutions adopted in some commercial terminals are introduced that will contribute to the integrated design of mm-wave antennas with lower band antenna. In addition, the human body model evaluation, the effect of the human body on the mm-wave array, and the human body shadowing are also illustrated. Various designs are being used to solve the mm-wave array challenge in mobile phones, with promising applications.
