DUAL-FREQUENCY FOUR-ARM HELICAL ANTENNA FOR APPLICATION IN SATELLITE NAVIGATION

摘要

Disclosed in the present application is a dual-frequency four-arm helical antenna for application in satellite navigation, comprising: a printed circuit board (PCB), a cylindrical dielectric body, and an antenna metal ground which is provided on a lower surface of the PCB; four monopole radiating arms are surroundingly printed in a spiral on a side wall of the cylindrical dielectric body, and an end of each monopole radiating arm is provided with a metallic copper column; a bottom portion of the cylindrical dielectric body is fixed on the PCB by means of the four metallic copper columns; each monopole radiating arm comprises a first coupling line, a second coupling line, a first microstrip line, and a second microstrip line. A connecting end of the first coupling line is connected to an end of the first microstrip line, while another end of the first microstrip line is connected to a metallic copper column; a connecting end of the second coupling line is connected to an end of the second microstrip line, and another end of the second microstrip line is connected to a junction of the first microstrip line and the first coupling line; the four metallic copper columns are equidistantly and symmetrically disposed on the bottom portion circumference of the cylindrical dielectric body. The antenna of the present invention has good directional pattern characteristics, circular polarization characteristics and dual frequency characteristics.