Compact Textile MIMO Antenna with Reconfigurable Dual Band Notching Characteristics for UWB Applications

Abstract

A compact textile MIMO antenna is presented with dual band notching characteristics for UWB applications. The proposed MIMO antenna consists of two radiating monopole elements placed orthogonal to each other with inverted U-shaped slot and U-shaped slot for dual band dispensing. The orthogonal placement of radiating elements provides sufficient amount of isolation between the two input ports and isolation of less than −22dB is achieved for entire range of frequency operation. A total volume of 20mm x 32mm x 1mm is occupied by total MIMO antenna system. Polarization diversity is obtained because of the orthogonal placement of radiating elements. By using PIN diode placed in the slots provided for notching characteristics, reconfigurable nature of band notches can be obtained The envelope correlation coefficient is less than 0.01 between the two monopoles. The suggested antenna is considered jeans cloth as substrate with dielectric constant of 1.67 and it has impedance bandwidth from 3.38GHz to 12.78GHz with two notch bands. One notch band is from 5.12GHz to 5.5GHz covering WLAN band and another notch band is from 7.98GHz to 11.4GHz covering X-band. Because of the broad bandwidth nature, the monopole radiators remain matched at the required band when upon the body.