QUADRIFILAR HELICAL ANTENNA WITH CIRCULAR POLARISATION CHARACTERISTICS

摘要

Disclosed in the present invention is a quadrifilar helical antenna with circular polarisation characteristics, comprising a PCB, a cylindrical medium body, and an antenna metal ground arranged on the lower surface of the PCB, four monopole radiation arms being printed on the side wall of the cylindrical medium body in a helically encircling manner, a metal copper column being arranged on the tail end of each monopole radiation arm, the bottom of the cylindrical medium body being fixed onto the PCB by means of the four metal copper columns, and each monopole radiation arm comprising a first coupling line, a second coupling line, a first micro-band line, and a second micro-band line. A connecting end of the first coupling line is connected to one end of the first micro-band line, and the other end of the first micro-band line is connected to a metal copper column; a connecting end of the second coupling line is connected to one end of the second micro-band line, and the other end of the second micro-band line is connected to the connecting point of the first micro-band line and the first coupling line, the four metal copper columns being equidistantly and symmetrically arranged on the circumference of the bottom of the cylindrical medium body. The antenna of the present invention has good directivity pattern characteristics and circular polarisation characteristics.