S11 and S21 measurements of the 8-channel monopole array with (left) and without (right) ICE decoupling method loaded with human head. Without decoupling treatments, mean S21 between adjacent, next adjacent and opposite elements of the monopole array was about −7.1, −11.5 and −15.6 dB, respectively, whereas the mean S21 between adjacent, next adjacent and opposite elements were reduced to −25.4, −25.1 and −40.3 dB, respectively, when the ICE decoupling method was employed. This indicates the coupling between any two monopole elements was reduced to a sufficient small value using the ICE decoupling method