Mode-Based Computation Method of Channel Characteristics for a Near-Field MIMO

This letter proposes a new mode-based method for estimating the channel characteristics of a near-field multiple-input-multiple-output (MIMO). When an antenna array composed of a short electric dipole and a small solenoidal loop is used, a 2×2 near-field MIMO can be effectively constructed according to the orthogonality of the TM
₁₀
and TE
₁₀
modes. By using the proposed method, the transmission characteristics of the MIMO and the mutual coupling effect at the antenna array can be easily calculated. In addition, the capacity of the MIMO can also be calculated by using the analysis results.