HELICAL ANTENNA

摘要

PURPOSE:To obtain a helical antenna whose radiation pattern is symmetrical by arranging a cylinder where a conductive wire is wound on the circle of a dielectric at a prescribed pitch and a dielectric cylinder where a conductor wire is wound in reverse winding direction at a prescribed pitch to the former winding direction at the inside of the former cylinder coaxially. CONSTITUTION:A helix 45 is wound on the dielectric cylinder 44 at a prescribed pitch and a helix 47 is wound on the dielectric cylinder 46 placed at the inside of the cylinder 44 at a prescribed pitch in the reverse winding direction to the former winding direction. The helical antenna whose radiation pattern is symmetrical and which is small in size and light in the weight is obtained by connecting a reflector 48 and connectors 49, 50 without using a metallic grating filter.