A Bandwidth-Enhanced Tunable Decoupling Method for Compact Mobile Terminal Antennas

This article presents a tunable decoupling method for closely spaced multielement antenna systems, which is able to enhance the decoupling bandwidth of each tuning state. The decoupling method utilizes parasitic scatterers and tunable circuit components, and its design approach is systematically studied. The decoupling method is evaluated by performing a simulation in which the decoupling bandwidth in a tuned state for a three-element antenna system is examined. In that case, only the circuit components are optimized. As another example of this procedure, the frequency reconfigurable decoupling bandwidth for a two-element antenna system is shown to increase by optimizing the parasitic scatterer and the circuit components in the lossless and realistic cases. This study is concluded by presenting a realistic evaluation for the decoupling of a two-element antenna in different tuned states.