MIMO antenna system of a compact 4-element PILA for 4G handset applications

A compact multiple input multiple output (MIMO) antenna system of four-element planar inverted-L antenna (PILA). The antenna elements are installed along the corners of a PCB board. To mitigate the mutual coupling effect, compact parasitic decoupling elements are used between elements. The design covers a very wide 6dB return loss bandwidth (1700–3500 MHz) with isolation level better than 10 dB. Both simulated and measured results are obtained, and the results demonstrate that the proposed antenna is a very good candidate for mobile diversity and multiple-input and multiple-output (MIMO) applications in recent 4G systems.