Textile Multiple Input Multiple Output Antenna for X-Band and Ku-Band Uplink-downlink Applications

In this communication, a textile multiple input multiple output (MIMO) antenna with two half ring shaped antenna elements is presented. The antenna covers the frequency spectra from 6.95 to 16.46 GHz with a fractional bandwidth of 81.24 %. It fulfills the ITU band (7.25-7.75/7.9-8.4 GHz) full X-band (8-12 GHz) and Ku-band downlink-uplink (11.7-12.2/14-14.5 GHz) application bands. Very high port isolation (> 15.5 dB) is obtained over the operating frequency band by using defected ground structure (DGS). The antenna provides very low envelope correlation co-efficient (ECC<0.09) and channel capacity loss (CCL<0.23 bits/s/Hz) whereas very high diversity gain (DG>9.95 dB) is obtained. Total active reflection coefficient (TARC) curve is found using different input excitation phase angles. This also confirms very good impedance behaviour of the antenna. All of these along with stable radiation patterns make the antenna a suitable MIMO aspirant in desired applications band.