Compact Omnidirectional MIMO Antenna for Wi-Fi and 5G Application

In this paper, a compact omnidirectional multiband MIMO antenna is proposed and investigated. Bending the branch of PIFA achieves the miniaturization, and etching a L-shaped slit on the ground extends the working band. The -10dB return loss bandwidth covers two Wi-Fi frequency bands (2400~2800 MHz, 5300~5800 MHz) and 5G communication band (3800~4400 MHz). The central rotatable method is applied to form a four-port MIMO structure. The results show that the antenna achieves a good diversity performance by the polarization diversity. The proposed antenna has a small size of 30 × 30 × 0. 8 mm3, with 360° omnidirectional patterns, promising for the practical applications.