This paper presents an improved method to isolate the ports for a MIMO antenna in hand-held devices using lumped components. It has been analyzed through simulation and measurement. The total efficiency and the envelope correlation have been evaluated. Compared to the case with no decoupling mechanism, the efficiency from the scattering parameters increases significantly and the envelope correlation coefficient decreases dramatically. Nevertheless, when choosing the components, the ohmic losses must receive extra consideration in order to maximize the system's total efficiency. Furthermore, the use of lumped components has the potential to make the presence of other components in the mobile device or the user, less harmful to the decoupling mechanism.
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