Half cutting dual-band circularly polarized monopole antenna for wireless communications

Abstract

In this work, a novel half-cutting technique has been implemented on the CP antenna to enhance the axial ratio bandwidth. The projected antenna is designed on 26mm×14.5mm×1.6mm FR4 substrate with relative permittivity 4.4 and loss tangent 0.02. The proposed patch is developed by loading an L – shaped open-ended slot on the monopole element. The half-cutting technique is incorporated on the ground plane flowed by loading circular-shaped slots and stubs. Results have been improved intensely. The achieved two impedance bandwidth (IBW) are 1.80 GHz (3.6 – 5.4 GHz) and 5.3 GHz (5.7 – 11 GHz) at the −10 dB reflection coefficient. Two 3 dB, ARBW of 0.29 GHz (4.38 – 4.67 GHz) and 4.91 GHz (5.79 – 10.70 GHz) are confirmed. The peak gain of 4.77 dBi at 8.46 GHz is achieved. The RHCP and LHCP waves are radiated along the broadside direction under the lower and higher CP modes. It is strongly applied for military and mobile communication (4.4 – 4.5 GHz), 802.11p WLAN (5.850 – 5.925 GHz), WiFi (5.925 – 7.125 GHz) in the united state, in satellite, DL (7.25 – 7.75 GHz) and UL (7.9 – 8.4 GHz) and X – band applications.