Compact multiband MIMO antenna for next generation USB dongle application

A multiple-input multiple-output (MIMO) technique has been considered one of the most promising technologies to enhance the performance of wireless communication systems with high-speed transmission rates. A MIMO system utilizing several antenna components is more advantageous than a single-input single-output (SISO) system in terms of increasing channel capacity and reducing transmitting power [1, 2]. Conventional universal serial bus (USB) dongles [3] are attractive for providing plug-and-play functionality in mobile communication devices such as laptops. Future wireless USB dongles should be capable of accommodating higher data rates than the current systems owing to the advent of various multimedia services. Up to date, most MIMO antenna systems with more than two antennas are three-dimensional rather than planar [4, 5]. In practice, low-profile planar antennas are more preferred so that antenna radiators can be easily integrated with other printed circuit board (PCB) components in USB dongles. �� 2010 IEEE