Equivalent circuit model of MIMO based on coupling matrix

An equivalent circuit model of coupled antennas for the multiple-input multiple-output (MIMO) system based on coupling matrix theory is presented. It is demonstrated that a four-port network including two resonators can be a good description of MIMO antennas such as asymmetric coplanar strip fed antennas. The equivalent circuit is established by coupling matrix extraction which is a widely used method in the coupling matrix analysis of filters. This equivalent circuit model for the MIMO system should be helpful in MIMO or decoupling network designs.