Compact Ultrawideband MIMO Antenna with WLAN/UWB Bands Coverage

Abstract—A compact multiple-input-multiple-output (MIMO) antenna that covers the WLAN (2.4GHz) and UWB (3.1–10.6GHz) bands for wireless device applications is presented. The proposed antenna consists of two open L-shaped slot (LS) antenna elements and a narrow slot on the ground plane. The antenna elements are placed perpendicularly to each other to obtain a high isolation, and the narrow slot is added to reduce the mutual coupling between antenna elements at the WLAN band (2.4GHz). The presented MIMO antenna has a small size of 40×40mm2, and the prototypes of antenna is fabricated and measured. The measured results show that the antenna has an impedance bandwidth of larger than 2.4–10.6GHz with the mutual coupling less than 20 dB in WLAN band and 18 dB in 3.1–10.6GHz, making the antenna a good candidate for portable applications. 1