| 摘要 |
PROBLEM TO BE SOLVED: To provide a new antenna device having a simple structure which reduces the weight of a structure which is a main mast provided with an antenna pattern (radiating element) and ensures its strength and rigidity, and to install it outdoors even in an environment where a branch line is difficult to attach as well. SOLUTION: This antenna device is installed outdoors, and is operated as a monopole antenna, and includes: a pillar-shaped dielectric which is erected on an installation face and is used as the main mast; a conductive wire extended from a distal end to a proximal end along this pillar-shaped dielectric; and a feed part which has one end connected to this conductive wire, and the other end connected to the installation face on which the pillar-shaped dielectric is installed. The antenna device further comprises at least four wires extended from the distal end to the proximal end along the pillar-shaped dielectric at a predetermined interval around the pillar-shaped dielectric, respectively, in addition to the conductive wire, and the conductive wire and the wires are held by the pillar-shaped dielectric. COPYRIGHT: (C)2009,JPO&INPIT
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