A SLOTTED PENTAGON SHAPE QUAD-BAND TWO-ELEMENT MILLIMETER WAVE MULTIPLE-IN, MULTIPLE-OUT ANTENNA USING THEORY OF CHARACTERISTIC MODES

This article proposes the millimeter wave two-element multiple-in, multiple-out (MIMO) for wireless applications. The designed antenna is closely packed with a dimension of 0.42 λ₀ × 1.03 λ₀. The antenna resonates at quad band with good gain and impedance matching. The single-element structure is a pentagon shape with two slits at the edges. Single-element structure performance is studied through characteristic mode analysis. The MIMO antenna decoupling structure has been effective, resulting in an isolation |S21| of 30 dB. The antenna has broadside radiation. The MIMO antenna also satisfies the diversity performance of envelope correlation coefficient, diversity gain, channel capacity loss, total active reflection coefficient, and mean effective gain.