MIMO antenna design challenges

This paper provides a brief introductions into the challenges involved when designing antenna for MIMO (Multiple Input Multiple Output) systems on small terminals. The investigation is based on the fundamental parameter of cross-correlation of the antenna transfer functions. Some considerations on the correlation of antennas implemented on small terminals are undertaken. It is shown that the correlation of the elements of a multiple antenna system which is implemented on a small terminal is significantly affected by the integration impairments and the platform itself.