Design of a compact UWB-MIMO antenna with high isolation and dual band-notched characteristics

A compact UWB-MIMO antenna with dual band-notched behaviors is proposed. The bending and E-shaped meander structures are introduced to broaden the bandwidth. Two circular patches are placed orthogonally and dual U-shaped branches are added for reducing the mutual couplings. Dual notches are achieved by embedding two L-shaped slots in the elements. The simulated and measured results show that the antenna has the wider impedance bandwidths of 2.68-12.50 GHz (Element 1) and 2.82-11.20 GHz (Element 2) except two notched bands. The notched bands of 5.12-5.81 GHz and 7.06-8.03 GHz are achieved for the element 1. The notched bands of 5.08-5.83 GHz and 7.02-7.98 GHz are achieved for the element 2. These notched bands accurately cover the WLAN band and X-band. Furthermore, the antenna obtains higher isolation, smaller envelope correlation coefficient, higher radiating efficiency, acceptable peak realized gain, and stable radiation patterns. Therefore, the antenna is suitable for building the UWB-MIMO communication systems with good performance.