Abstract
Authors have proposed a stacked rectangular microstrip antenna with a shorting plate for Dual-band operation in ITS. In this paper, a stacked rectangular microstrip antenna with a shorting plate combined with a rectangular ring microstrip antenna has been proposed for triple-band operation. Although the proposed antenna consists of two antennas, the antennas are excited by one L-probe feed. By simulations, the relationships of antenna characteristics (the return losses and the polarized waves) at GPS, VICS and ETC bands are clarified.