Modified Circular Common Element 4 Port MIMO Antenna Using Diagonal Parasitic Element

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Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:11.0pt; font-family:"Calibri","sans-serif"; mso-ascii-font-family:Calibri; mso-ascii-theme-font:minor-latin; mso-fareast-font-family:"Times New Roman"; mso-fareast-theme-font:minor-fareast; mso-hansi-font-family:Calibri; mso-hansi-theme-font:minor-latin; mso-bidi-font-family:"Times New Roman"; mso-bidi-theme-font:minor-bidi;} A 4-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 inter-port isolation. The antenna has a 2:1 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 (ECC) is < 0.01. The diversity gain is about 10 dB between adjacent ports and the -10 dB total active reflection coefficient (TARC) bandwidth is 202 MHz. To check the effectiveness of Wi-Fi antenna near the human body or head the specific absorption rate (SAR) is observed < 1.6 W/Kg by CST simulation tool.