Maximized Capacity of Coupled Antennas Based on Multipolar Radiations

The maximum achievable capacity of colocated multipoles is simulated and two practical mode-decoupled antennas with closely-coupled dipoles are proposed in this work. The concept of multipolar radiation leads to the design of mode-decoupled antennas. Because of the orthogonality property of radiation patterns between different antenna modes, not only the capacity can be maximized but also the excitation network can be decoupled. The proposed multipolar antennas with mode-decoupling benefit give a clear interpretation of the relations between antenna excitation, pattern, and capacity