Asymmetrical CPW-Fed Circularly Polarized Two-Port MIMO Antenna for Satellite and Wi-Fi 6E Communication

Abstract

A circularly polarized compact two-port MIMO antenna is presented along with asymmetrical CPW feed and a novel decoupling structure. The asymmetric CPW feed of the antenna is improving the impedance matching significantly and shifting the operating band towards the lower frequency. The novel inverted Z-shaped decoupling is used to enhance the isolation which mitigates the surface wave effectively between two antennas. The triangular-shaped inductive stubs are unified in the inverted Z-shaped decoupling structure which is used to perturb the surface wave movement and to influence the circular polarization (CP) behaviour in the two-port antenna. MIMO antenna obtains the 10 dB impedance bandwidth (IBW) from 6.38 GHz to 6.84 GHz along with minimum port isolation of 30 dB. The 3-dB axial ratio (AR) is obtained from 6.59 to 6.84 GHz frequency which is 52.1% of the total 10 dB IBW of the antenna. The proposed work can be prominent for super-extended C-band of satellite communication and Wi-Fi 6E U-NII6 and U-NII7 communication.