Array antenna with high isolation based on EBG structures for ETC applications

Abstract

A RHCP (Right Hand Circular Polarization) microstrip array antenna with EBG structures is designed and optimized. Compared with a conventional RHCP microstrip array antenna, the proposed antenna accomplishes high isolation up to -28dB. High isolation is achieved by simultaneously implementing mushroom-like electromagnetic gap band (EBG) structures, which operate in the same frequency range with the microstrip antenna. To validate our design method, comprehensive simulation has been done. Furthermore, both the return loss and axial ratio bandwidth of the proposed antenna cover the ETC operating band (5.75 GHz to 5.84 GHz) in China.