Design and Analysis of MIMO Antenna with Improved Bandwidth and Isolation

The Multiple-InputMultiple-Output (MIMO) technology plays a crucial role by improving the data rate and wide coverage. With MIMO technology the number of antennas increases, as the number increases the placement of antennas in a stipulated space with shared ground plane leads to increase of mutual coupling. As the spacing between two antennas is highly reduced, it causes mutual coupling and fluctuates the desired result. Therefore, degrades the performance of MIMO antenna. To maintain isolation between the antennas is a challenge for WLAN applications. The design and simulation work are carried under AWR software. Patch design is made on Rogers 6035 substrate with 3.5 dielectric constant and 0.51 thickness. The overall dimension of the proposed 2X2 WLAN MIMO antennas are 16 x 38 x 0.51 mm³. The measured bandwidth of 540MHz (4.71-5.25GHz) with better return loss of –40 dB and isolation of -40dB for 2X2 antennas are achieved. The measured bandwidth, realized gain and radiation efficiency, envelope correlation coefficient for 2X2 MIMO antenna is analysed and achieved at 5GHz frequency. The results show that it could be a decent choice for the WLAN applications.