MIMO Antenna Design with Reconfigurable Radiation Pattern and High Port Isolation

A novel design approach for two-element antenna array with reconfigurable radiation patterns, high port isolation and low return loss is presented. The proposed antenna system can offer switchable radiation patterns with simple circuit and control scheme. Furthermore, closed-form explicit formulas are readily available for the evaluation of the circuit parameters and the resultant radiation patterns. For validation, a slot antenna array with small element-spacing is prototyped and characterized. Experimental results reveal that the proposed method can provide adaptive pattern diversity with excellent port isolation and return loss performance.