  This paper presents designs and prototypes of low cost multiple input
multiple output (MIMO) antennas for 5G and millimetre-wave (mm-wave)
applications. The proposed MIMOs are fabricated using 3D printing and are able
deliver beams in multiple directions that provide continuous and real time
coverage in the elevation of up to 30{\deg} without using phase shifters. This
equips the proposed MIMO with a superior advantage of being an attractive low
cost technology for 5G and mm-wave applications. The proposed MIMO antennas
operate at the 28 GHz 5G band, with wide bandwidth performance exceeds 4 GHz
and with beam switching ability of up to 30{\deg} in the elevation plane. The
direction of the main beam of the single element antenna in the MIMO is steered
over the entire bandwidth through introducing a 3D printed walls with different
heights on the side of the 3D printed radiating antenna. Unlike all other
available beam steering techniques; the proposed wall is not only able to
change the direction of the beam of the antenna, but also it is able to
increase the overall directivity and gain of the proposed antenna and MIMO at
the same time over the entire bandwidth.
