Design of Dual-Mode Dual-Band Vehicle Mounted Monopole Antenna

In this paper, a monopole antenna with dual band is designed for vehicle measurement. Two discs with different dimensions act as the radiator, and the connection part of two radiators is utilizes for the supporting structure with top loaded. In final, the antenna is operated around 1450MHz and 1950MHz bands, and a compact vertical dimension of 0.2λ is obtained. Besides, the proposed antenna has good omnidirectional pattern at two band with average gain of 1.4dBi at 1450MHz and -1.1dBi at 1950MHz, while bidirectional radiation patterns are obtained in the vertical plane at both operating bands.