Design of asymmetric CPW fed slot antennas for pattern and polarization diversity

This paper presents the design of an ultra wideband slot antenna for MIMO diversity applications. The antenna has an asymmetric rectangular slot to achieve the broad band impedance matching. The simulated band width of the antenna is 3.0 to 12.0 GHz which is beyond the FCC band. For MIMO, the antenna is implemented in four different configurations. To assess the diversity performance, the envelope correlation coefficient, diversity gain and capacity loss are calculated for all the configurations. From a comparison of the results, it has been found that the antennas placed in the orthogonal configuration offer the best impedance matching and isolation over the band. The proposed antennas are compact and have a peak gain around 5dBi which increases slightly over higher frequencies in the operating band.