Compact Circularly Polarized Conformal Square - Ring Slot Based Antenna for Reliable Vehicular Connectivity

This study suggests a circularly polarized square ring slot-based microstrip patch antenna suitable for vehicular communication system. The antenna design involves a chamfered square-shaped patch placed within a square ring slot, connected by two small stubs. Circular polarization has been achieved by chamfering the opposite corners of a inner square patch. The impedance bandwidth is achieved to be 750 MHz (5.15-5.90 GHz), while the 3-dB Axial ratio bandwidth (ARBW) is obtained from 5.15 GHz to 5.22 GHz respectively. Both the planar and conformal versions of the proposed antenna demonstrate wideband characteristics. In addition, using a virtual model of the car, the radiation characteristics of the antenna while placed on a vehicle were investigated. The results reveal that the proposed antenna is compact, performs well, and is well suited when integrated with vehicle targeting WLAN applications.