The proposed MIMO (multiple input multiple output) antenna consist of compact four channel MIMO microstrip\nantennas whose incremental distance of 0.5�» was kept between adjacent patch elements, the four antenna elements were placed\northogonally from each other. The proposed MIMO antenna was operating at 2.6 GHz and 5.1 GHz with -15.2 dB and -20.1 dB\nisolations respectively for S and C radio band applications. The introduction of complimentary octagon split ring slot defected\nground structure (COSRSDGS) integrated with MIMO antenna leads to limits the surface wave between them and reduction of\nmutual coupling by -25 dB and -20 dB with respect to resonating frequencies 2.6 GHz and 5.1 GHz respectively. The system can\ncover a 75.2 MHz and 290 MHz operating bandwidth with total size of 40 x 40 x 1.6 mm3. The simulated and measurement\nresults such as return loss, impedance bandwidth, VSWR (Voltage Standing Wave Ratio), gain, mutual coupling coefficients and\nradiation pattern, envelope correlation coefficient (ECC), diversity gain were identified as having good performance of the MIMO\nantenna.
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