5G is coming to market. PRO-CELL CO., LTD develop 5G antenna since 2016,
In 5G antenna, that will be separated in SUB-6G & mmWave,
There are most economical way to make mmWave antenna should be to use IC tech. Because traditional RF tech. will not easy to make such 24-40GHz antenna, but we believe 5G mobile quantity should be no problem in quantity for IC processing.
For Sub 6GHz - 5G antenna, that will be able to make by traditional RF field. See following link, you will find more antennas for 5G system :
There are be a little bit similar as LTE antenna, but more widly band.