Small and compact MIMO antenna for USB dongle applications

This paper proposes a small and compact MIMO antenna for USB dongle application. The proposed MIMO antenna consists of two PIFA antennas that operate the same frequency band at around 2.4 GHz for applying at WLAN band (2.4 to 2.484 GHz). An inverted-E element between the PIFAs and a meandered neutral line on the back side are used to increase isolation between the PIFAs, which is higher than 15 dB over the operation band. Two connected holes are used to connect the neutral line and the two PIFAs. The antenna portion of 20 mm × 8 mm and overall dimension of 20 mm × 55 mm can be easily applied in the USB dongle.