Tri-band four elements MIMO antenna system for WLAN and WiMAX application

A new L-shaped slot dipole for multiple-input–multiple-output (MIMO) antenna system with an L-shaped slit is presented for WLAN and WiMAX applications. The L-shaped slot provides two bands at 2.4 and 5.2 GHz, and the third frequency at 3.5 GHz is achieved by introducing the L-shaped slit. The MIMO antenna consists of four symmetrical antenna elements. Each element is fed through a 50- microstrip feed line-coupling electromagnetic field to the slot. A high isolation of 16 dB among the four antennas is achieved for an antenna spacing less than 0.05 . The MIMO structure gives high gain ( dB), low correlation ( ), and high radiation efficiency ( ) The results indicate that the proposed MIMO antenna can provide spatial or pattern diversity to increase data capacity of wireless communication systems.

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