Compact Meta-Surface Antenna Array Decoupling (MAAD) Design for Tightly Coupled Antennas

This paper introduces a series of antenna array decoupling method named Meta-surface Antenna Array Decoupling (MAAD) Method. It has two forms: meta-cover and meta-ground, which place sub-wavelength resonators above and below an antenna array, respectively. By properly adjusting the working frequency of the sub-wavelength resonators, the distance between the antenna array and the meta-surface as well as the self-matching of each antenna array elements, the method can significantly reduce the mutual coupling between the element in an array, while maintain or even increase its matching bandwidth. Thanks to the periodic nature of the meta-surface, the method can directly extended to antenna arrays with more than two elements. It can find good application scenarios in both mobile terminals and Massive MIMO base stations of 5G wireless communication systems.