| 摘要 |
PURPOSE: An antenna unit for suppression a radio radiation to a high angle of elevation is provided to suppress a radio radiation to a high angle of elevation and radiate a radio wave at a level less than a horizontal plane. CONSTITUTION: An angle of elevation of a curve of an upper part is downwardly bent based on a predetermined radius of curvature. A lower part takes a shape having a radius of curvature greater than the predetermined radius of curvature, or a shape being almost straightened. A radio radiation element(2) is installed such that a focal length of a reflector(1) is a radiation point, and supported by a radio radiation element support(4). A radio wave supplied to a high frequency feed connector(3) is radiated from the radio radiation element(2) and thereafter reflected in a horizontal direction or a downward direction at the reflector(1). The radio wave reflected on an upper end part of the reflector(1) is largely reflected downward on a horizontal plane, similarly to an upper end part reflected wave(5). A radio wave reflected on a central part of the reflective part(1) is slightly reflected downward on a horizontal plane, similarly to a central end part reflected wave(6).
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