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Optimization of 60 GHz MIMO antenna by adding ground stub to reduce mutual coupling for WPAN applications

In this paper a novel 60 GHz printed antenna with defected ground structure is proposed for MIMO application. The antenna consists of a pairs of folded L-shaped strips patch printed on silicon subtract for wireless personal area network (WPAN) at 60 GHz. The two radiating elements are separated by distance equal to 1.25 mm. The performance of the proposed antenna has been evaluated after adding the cone ground stub especially the mutual coupling. Proposed antenna is resonating at 60 GHz. Return loss of −17.85 dB is achieved for 60 GHz band. The mutual coupling is less than −15 dB throughout the bandwidth (56 GHz–64 GHz). The simulation results indicate that the antenna can provide spatial diversity and enhance isolation.