A DESIGN OF AM FM MOBILE TELEPHONE TRIBAND ANTENNA/

In vehicles, antennas for AM/FM broadcasting (BC) and cellular mobile telephone (MT) are usually mounted on the car's body. However, a triba nd antenna which can be used for both AM/FM BC and MT is more desirabl e to decrease the number of antennas. An outline of the general design for the AM/FM MT triband antenna with coils is described. Next, the d esign of a new triband antenna with double sleeves instead of coils is presented. The double sleeves consist of two coaxial lines connected in series. It is shown that the triband antenna with double sleeves ha s good characteristics, including radiation patterns and voltage stand ing-wave ratio (VSWR).