Compact UWB MIMO antenna with WiMAX and WLAN rejection

An Ultrawideband (UWB) MIMO antenna capable of covering 3.1 to 10.6 GHz frequency band having compact size is presented. To avoid severe electromagnetic interference from the narrow band services, band rejection characteristics is provided at 3.3 to 3.7 GHz WiMAX band and 5.15 to 5.85 GHz WLAN band. The proposed antenna gives good isolation of less than -20 dB at all frequencies. Results show that the H plane radiation pattern is omni-directional and antenna gain is almost stable in the entire operating frequency range. Envelope correlation coefficient less than 0.008 ensures better diversity performance.