Improving Isolation in MIMO Antenna for WLAN Applications

The system Wireless Local Area Network (WLAN) presents minimum bandwidths to provide required transmission data rates, isolation can also be improved using multiple input multiple output (MIMO) scheme increasing their capacity. In this paper, the Decoupling Networks technique is presented to reduce the coupling between the elements of the MIMO antenna and thus improve data rate with a 2x2 MIMO antenna system. The dielectric used was FR4 substrate with dielectric constant εr = 4.4 and thickness of substrate 1.544 mm. The S11 and S12 scattering parameters were obtained as well as ECC at the resonance frequency and bandwidth. The radiation pattern and the current density are simulated by HFSS. The antenna size is 80x65mm^2.