Miniaturized dual-layers LTE MIMO printed antenna with hybrid decoupling elements to improve isolation

A miniaturized multilayer internally multiple-input multiple-output (MIMO) printed antenna system combined with hybrid decoupling elements to improve isolation between two antennas at triple Long-Term Evolution (LTE) bands is presented in this paper. To reduce the single antenna size, the meander lines are stretched perpendicularly on the two respective layers that its overall dimensions are 14 × 15 × 3.2 mm³. Two different mechanisms are introduced for enhancing the port isolation at two different frequency bands. The isolation within three desired bands could be improved to all below -20 dB.