A multiple‐input‐multiple‐output (MIMO) hexagonal prism omnidirectional radiation antenna is proposed, which consist of nine elements. The antenna elements are divided into two groups, one of which is placed in parallel on spaced three surfaces of the prism and the other is placed vertically on the other spaced three faces. Each parallel element consists of two coplanar microstrip patches which are nested in each other for miniaturization. Each vertically element consists of two improved dipoles. The working frequency bands of the proposed prismatic antenna are 3.45 GHz, 4.9 GHz, 5.8 GHz, and 15.2 GHz.
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