Suppression of the mutual coupling between two adjacent miniaturized antennas utilizing printed resonant circuits

The isolation between antennas is a critical parameter in many practical applications such as antenna arrays, multiple input and multiple output (MIMO) communication systems, and integrated antenna systems. However, the close spacing between each of antennas generates the cross talk factor and restricts the integration of antenna system. To address the problem the authors proposed a new approach, by using the printed circuit technology and vertical vias, complexity of fabrication process can be decreased. Furthermore, by utilizing the parallel resonant circuits, this proposed approach can achieve the improvement of isolation between two closely spaced miniaturized antennas with a small dimension of structure and small number of periodicity. The response of the proposed structure is demonstrated through extensive numerical simulations using a commercial finite element method (FEM) solver.