Antenna employing curved parasitic end-fire directors
OwnerRichard D. Bognerinventor
Life of this patent
Estimating the term…
Abstract
An antenna assembly comprising elementary driven antenna elements and curvilinear end-fire directors on a conventional supporting structure to obtain an omnidirectional or other desired antenna pattern, even for supporting structures of relatively large transverse dimensions. The end-fire directors employ one or more curved conductive members.
Claims11
An antenna assembly for transmitting signals of a given wavelength, comprising an elongated electrically conductive supporting structure having a major transverse dimension such as to effect the pattern of the antenna assembly, a driven antenna element carried by said supporting structure and defining a radiation axis extending therefrom, and at least one end-fire parasitic director extending generally from said structure and comprising a conductive member concavely curved with respect to said structure in a plane containing the electric vector radiated by the said driven antenna element, which plane is also normal to the axis of said elongated conductive supporting structure, said director being so positioned relative to said driven antenna and supporting structure as to alter the shape of the antenna pattern produced by the combined effects of said driven antenna and supporting structure, while not intersecting the radiation axis of said driven element, to provide a selected pattern for said antenna assembly said conductive member being curved with an average radius between one-eighth and one times the major transverse dimension of the support structure and has a linear dimension in said plane between approximately one-fourth and one-half wavelength.
An antenna assembly for transmitting signals of a given wavelength, comprising a vertical elongated electrically conductive supporting structure having a transverse dimension of at least approximately one-fourth wavelength, at least one bay including a driven antenna element carried by said structure for producing radiation of horizontal polarization and defining a radiation axis extending from said element, means for feeding electrical energy signals to said driven antenna element, and a pair of end-fire parasitic directors extending generally horizontally from said driven element, each of said directors comprising a conductive member having a linear dimension in a plane parallel to the plane of the electric field vector to the transmitted signal of approximately one-fourth to one-half wavelength, said conductive member concavely curved with respect to said structure in the horizontal plane, said conductive member having a vertical dimension of at least approximately one-third wavelength, said director being so positioned relative to said driven antenna and supporting structure so as to alter the shape of the antenna pattern produced by the combined effects of said driven antenna and supporting structure, while not intersecting said radiation axis, to provide a selected pattern for said antenna assembly, wherein said end-fire directors each include additional conductive members concavely curved with respect to said structure, wherein the minimum spacing between the said conductive members measured in the horizontal plane is approximately one-eighth to one-half wavelength.
Dependencies are inferred from the claim text.