| （英） |
Complex radiation patterns is one of the figure of merit for MIMO~{(Multiple-Input Multiple-Output)} antenna. In general, complex radiation patterns are measured by using coaxial cables, small oscillators or fiber optic cables. However, by using conventional methods, either low accuracy, or high measurement cost is inevitable. In this report, a novel evaluation method of complex radiation patterns of MIMO antenna is presented. The proposed method estimates complex radiation patterns from channel responses obtained by switching the termination load of MIMO antennas. Because the proposed method estimates complex radiation patterns without using coaxial cable and small oscillators, the proposed method gives complex radiation patterns accurately in low cost. Results of the numerical simulation shows that the proposed method gives complex radiation patterns accurately when distance between observation antennas and MIMO antennas is larger than $8lambda$ in low noise environments. |