A Quad-Band Compact Inverted-F MIMO Antenna for USB Dongle Applications

This paper shows multi-band (quad) inverted-F MIMO antenna with the high isolation that covers WIFI and WiMAX bands (2.4, 3.7, 4 and 5.3 GHz). The design consists of two symmetric inverted-F antennas separated by 0.12 λ0. The high isolation is achieved by adding a meander line immersed in inverted T-slot shaped in the ground plane which is a vital element for the least three bands. Moreover, two V-shaped slits were etched on the two 50 Ω transmission lines to modify the impedance matching. The S_{11 <;} -15db to ensure the high isolation of the proposed design that covers multi-range bandwidth. The proposed design was modified by shifting the vias locations, chamfering the edges of the feeding lines and extending the length of the inverted-F antennas to cover the lower band of WIFI. The proposed design dimension is 52×77.5 mm².