Circularly polarized dual band micro strip patch antenna for vehicular wireless network communications

A circularly polarized dual band micro strip patch antenna for vehicular wireless communication at 2.45 GHz and 5.5 GHz is designed and studied its performance. To obtain the circular polarization, slots have been introduced at the sides of the rectangular patch. Axial Ratio bandwidth of 700 MHz and 230 MHz at lower (1.9 GHz-2.6 GHz) and higher (5.4 GHz-5.63 GHz) frequency bands are observed using electromagnetic (EM) simulation tools. The proposed antenna gives 2.24 dB at 2.45 GHz and 4.97 dB gain at 5.5 GHz and impedance bandwidth of 320 MHZ at 2.4 GHz band and 450 MHz at 5 GHz band. Omnidirectional radiation pattern, improved Circular polarization, small dimensions and low cross polarization at both bands make this antenna particularly suitable for vehicular wireless communication networks.