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.