Reconfigurable band-notched UWB-MIMO antenna

A miniaturized ultrawideband (UWB) multiple-input multiple-output (MIMO) antenna with reconfigurable band-notched characteristics is examined in this paper. The MIMO antennas exhibit a good impedance match over frequency band of 2.5 GHz-10.4 GHz, while exhibiting high isolation. The proposed MIMO antenna system consists of two complementary radiating patches and a common ground plane. Enhanced isolation is achieved with a ground structure consisting of a strip line and a slotted circular ring at the center. The decoupling structure provides isolation of more than 25 dB over whole UWB band spectrum. Moreover, the reconfigurable band-notch characteristic is achieved by introducing switches to quarter-wave slots in the main radiators. The notch is achieved for WLAN 5.5 GHz (5.15-5.825 GHz). The proposed antenna results suggests that the antenna design is suitable for UWB-MIMO applications.