Isolation Enhancement of MIMO Antenna for Wireless Routers in LTE band Applications

A compact wireless router multiple-input-multiple output (MIMO) antenna for Long Term Evolution (LTE) 2300 band (2300 ? 2400 MHz) and 2500 band (2500-2690 MHz) applications is proposed. The antenna structure consists of two loop parasitic shorted strips and a slot cut between them. The isolating slot not only reduces the coupling between the two monopole antennas, but also improves the bandwidth and efficiency. Without the usage of any additional coupling elements between closely mounted antennas, the proposed antenna achieves isolation of higher than 20 dB, envelope correlation coefficient (ECC) of less than 0.01 and total efficiencies of higher than 82%. A prototype antenna was fabricated and tested for experimental verification. Both simulated and measured data are provided.