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Technology of MIMO using multiple antennas and Carrier Aggregation operating multiple frequency bands are introduced in a mobile terminal to improve communication capacity. However, if plural MIMO antennas are installed closely, mutual coupling between the antennas must be reduced to suppress deterioration of radiation efficiency and increase of correlation coefficient. In this paper, we proposed a decoupling method for dual-band using trifurcation elements. Moreover, it is confirmed to be broadened decoupling bandwidth by optimizing branch width and length.

A decoupling method for MIMO antenna using trifurcation elements