Design, analysis and characterization of four port multiple-input-multiple-output UWB-X band antenna with band rejection ability for wireless network applications

In this proposed research article, four-port dual notched bands multiple-input-multiple-output (MIMO) antenna configuration is proposed and is experimentally investigated by fabricating prototype. Initially, a single element is fabricated which is converted to 2 × 2 MIMO configuration and finally to 4 × 4 MIMO configuration. The proposed MIMO antenna is designed to cover impedance bandwidth of 3.15–11.36 GHz and hence is useful in applications for ultrawideband and X-Band applications. Two interfering bands, WiMAX (3.30–4.05 GHz) and WLAN (4.90–5.99 GHz) are eliminated by using an inverted T-shaped stub and C-shaped slot on the radiating patch of the MIMO antenna. The proposed MIMO antenna offers good diversity performance with envelope correlation coefficient < 0.02, directive gain > 9.95 dB and total active reflection coefficient ≤ 20 dB in the entire operating band. Also, antenna gain is stable in the entire operating band except in interfering bands with a maximum radiation efficiency of more than 80% and stable radiation pattern. All the above said features make the proposed antenna suitable for high-speed wireless network applications.