Four‐port shared rectangular radiator with defected ground for wireless application

Summary In this research work, a modified shared rectangular radiator is proposed for 5.7‐GHz wireless application using multiple cuts and partially stepped ground. The shared design requires no isolating structure to decouple the ports. The proposed shared geometry produces >13 dB isolation in the 4.4‐ to 6.4‐GHz operating band. The gain varies from 3.0 to 6.2 dBi, and radiation efficiency is >70 % in the band. The mutual coupling among the port is reduced by orthogonal arrangement of ports, and envelope correlation coefficient (ECC) is <0.04 in the presented band. Apart from this, isolation in the proposed shared radiator is enhanced by additional multiple cuts with stepped ground. The indoor‐outdoor suitability of multiple input multiple output (MIMO) antenna for isotropic and Gaussian medium is checked by mean effective gain (MEG) and specific absorption rate (SAR). The presented results of MEG and SAR fulfill the required safety norms as per the ITU for different environments.