A four-port shared radiator is proposed for 5.2 GHz wireless application using multiple-cut rectangular geometry and partially stepped ground. The difficulty in making the shared radiator structure is almost removed in the presented design, and without the help of any isolating structure, sufficient value of isolation is achieved. The proposed shared geometry produces isolation of >10 dB in the 4.96–5.5 GHz operating frequency band. The gain of the MIMO antenna varies from 2.4 to 5.5 dBi, and radiation efficiency is >63% in the proposed band. The ports are arranged in an orthogonal manner to reduce the mutual coupling. An envelope correlation coefficient is <0.03 in the proposed antenna band. The total active reflection coefficient bandwidth of the antenna is 500 MHz with best combination of input excitation angles of 90, 180°. The isolation in the proposed shared radiator is enhanced by creating multiple cuts and stepped ground. To check the suitability of antenna for indoor and outdoor environments the mean effective gain and specific absorption rate results are also presented in the paper and it found under the required safety norms as per the international telecommunication union for uniform and Gaussian environments.

A four‐port multiple input multiple‐output (MIMO) antenna with common radiating element is proposed for 2.4 GHz Wi‐Fi applications. It comprises a modified circular radiator fed by four identical modified feedlines, partial ground planes, and a diagonal parasitic element (DPE). The parasitic element is used to enhance the interport isolation. The antenna has a 2:1 Voltage standing wave ratio (VSWR) impedance band 2.34‐2.56 GHz and nearly omnidirectional radiation patterns. The radiation efficiency is more than 79% and gain is 2 dBi at resonant 2.43 GHz. The isolation in the given frequency band is 10 dB. At the 2.43 GHz, the isolation between adjacent ports (1, 2 and 1, 4) is 14 dB and between opposite ports (1, 3) is 12 dB. The mean effective gain (MEG) ≤ −2.7 dB and envelope correlation coefficient is <0.01. The −10 dB total active reflection coefficient bandwidth is 202 MHz. The antenna is designed for a Wi‐Fi device and the effectiveness of antenna has been checked for distance of ½ feet from the human head. The specific absorption rate (SAR) is found to be ≤0.17 W/Kg by CST simulation tool.