Patent ID: 6127987
Filing Date: 2000-10-03
Classification: H01Q

Abstract:
An antenna having a basic structure comprising:a cylindrical member, provided on one face of the first board-shaped dielectric material;plural second board-shaped members provided as radiating on the outer surface of the cylindrical member, one end face of each second board-shaped member being in contact with the surface of the first board-shaped dielectric material; andplural sets of plural pole members perpendicular to the surface of the first board-shaped dielectric material, made by forcing out corresponding portions of the first broad-shaped dielectric materials, the sets radiating from the outer surface of the cylindrical member, the plural pole members in each set being arranged in a line, and each set existing between two positional directions of the adjacent two second board-shaped members,wherein the basic structure is formed with a dielectric material using one or more metal molds;the surface of one face of the first board-shaped dielectric material and the surfaces of the cylindrical member, the second board-shaped members and the pole members are coated with a conductive coating, by which the first board-shaped dielectric material, the cylindrical member, the second board-shaped members, and the pole members function as a ground plane, a reflector, fins, and parasitic elements, respectively; anda radiator is provided on an extension from each line on which a set of the parasitic elements on the ground plane exists and between the innermost parasitic element and the outer surface of the reflector, each radiator being formed by forcing out a corresponding portion of the dielectric material as the ground plane, and by making a hole in the forced-out portion and providing a conductive material into the hole.