Quadrifilar Helix Antenna

摘要

A quadrifilar helix antenna ( 1 ) comprising a first and a second set of helical antenna elements ( 2 a- 5 a, 2 b- 5 b) symmetrically arranged around a longitudinal axis extending through the axial center of the antenna ( 1 ). The antenna ( 1 ) is excited from feeding points ( 2 c- 5 c) in a local ground plane at the bottom ( 6 ) of the antenna. The helical antenna elements ( 2 a- 5 a) of the first set are interconnected in respective top ends of the elements at the top ( 7 ) of the antenna. The bottom ends of the first set are in galvanic contact with the respective feeding points ( 2 c- 5 c). The antenna is characterized in that the top ends of helical antenna elements ( 2 b- 5 b) of the second set are arranged in an open circuit and remain unconnected. The bottom ends of the helical antenna elements ( 2 b- 5 b) of the second set each includes a connection ( 2 d- 5 d) to the local ground plane.