Stacked Rectangular Microstrip Antenna with a Shorting Plate and a Helical Pin for Triple Band Operation in ITS

A stacked rectangular microstrip antenna with a shorting plate and a helical pin is proposed as a car antenna for triple band operation in ITS. The proposed antenna operates as a conventional stacked microstrip antenna at the highest frequency band. At the middle and the lowest frequency bands, the antenna radiates at low elevation angles from the helical pin and the shorting plate. In this paper, as an example of triple band antennas in the ITS, an antenna is designed that supports PHS, VICS and ETC. The proposed antennas have the proper radiation pattern for each application and are small in size. key words: stacked microstrip antenna, triple band operation, helical pin, shorting plate, ITS (Intelligent Transport Systems)