Design of a radiation pattern reconfigurable antenna for electronic toll collection in intelligent transport system

Abstract:

In this paper, we propose a radiation pattern reconfigurable microstrip dipole antenna for Electronic Toll Collection (ETC) in Intelligent Transport System (ITS). The antenna consists of five dipoles connected or disconnected by five pin diodes on the top side of substrate. Based on the switching state of the PIN diodes, the radiation pattern of the proposed antenna can be reconfigured into three modes. In these three modes, the antenna maintain a resonant frequency of 5.8 GHz. The antenna obtains a high gain thanks to a surface reflective structure integrated under the substrate of antenna. The proposed antenna is designed on FR4 substrate with the relative permittivity of 4.4, the thickness of 1.6 mm, and the loss tangent of 0.02 and it is simulated and optimized using combination of Computer Simulation Technology (CST) microwave and CST design software.