  Multiple-input-multiple-output (MIMO) antenna will play a key role in the
development of fifth generation (5G) wireless mobile communication systems due
to their performance-enhancement capability in multipath environment. Antenna
radiation efficiency is an important parameter for MIMO antenna system. In this
paper, we present a comparison of MIMO antenna efficiency measurements
performed in Anechoic Chamber (AC) and Reverberation Chamber (RC) at the UK
National Physical Laboratory. Two commercial available directional dual
polarized full LTE band MIMO antennas were measured both in AC and RC between 1
GHz and 3 GHz.
