DESIGN AND ANALYSIS OF HIGH ISOLATION MIMO ANTENNA FOR WIRELESS APPLICATIONS

The ever increasing demand for high data rates drives the wireless communication standards towards incorporation of multi input multi output (MIMO) technology. For such systems, the designed antenna must be compact with low profile configuration, good impedance bandwidth and low mutual coupling. In this paper, a compact two-element double E shaped microstrip antenna operating at dual band 2.45 GHz & 1.57GHz is proposed specially used for multiple-input–multiple- output (MIMO) communications. First, the miniaturization is investigated by using double E shaped patch antenna structure. Next adding corrugated stub structure (CSS) between two patches for to enhance isolation in microstrip antenna arrays. The proposed CSS acts like a band-reject filter to reduce the coupling between the radiators in the antenna array. The Proposed antenna has been designed on FR4 substrate dielectric constant 4.4 and thickness h=1.53 mm & its dimension is 64.0 mm × 100.0 mm × 1.6 mm. The low frequency band covered is 1.56-1.59 GHz, and the high frequency band covered is 2.43-2.48 GHz. The isolation between the two elements was -51.0dB & -30.0 dB respectively after using a corrugated stub structure (CSS) between the two antenna elements. The gain of proposed antenna is around 2.45dBi. Experimental results show an high mutually coupling for an array with reduced edge-to-edge spacing of 15 mm.