A Decoupling Technique Based on Partially Extended Ground Plane for Compact Two-Port Printed Monopole Antenna Arrays

Compact antenna arrays are highly demanded by modern communication devices. Dimension reduction of antenna arrays causes significant problems such as mutual coupling between input ports and poor radiation efficiency. A two-port compact printed monopole antenna array for small terminals is designed and fabricated. The solution is simpler and cheaper as compared to alternative techniques. The proposed antenna array operates from 5 to 6.5 GHz; the distance between the radiation elements is less than 0.25lambda. Good matching and decoupling results are achieved, which is proven by both simulations and real device measurements.