A new perspective for decoupling closely spaced polarized antennas

The paper describes a fresh look into the old problem of decoupling closely spaced antennas relying on the antenna polarization properties. The new perspective relies on modeling the near-field antenna cross-coupling as a local multiple-input-multiple-output (MIMO) channel. The approach provides a simple intuitive understanding of the decoupling mechanism and can predict the coupling conditions of the multiple antenna system before running electromagnetic simulations. Finally, we show how to utilize such approach for accessing the antenna polarization degrees of freedom for obtaining a high level of antenna isolation required for certain applications like the transmitter-receiver isolation.