| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device which has an omnidirectional horizontal radiation pattern and can set the direction of a main beam to a desired direction in a vertical plane. SOLUTION: In the antenna device, a dipole antenna including antenna elements 11 and 12 and a dipole antenna including antenna elements 21 and 22 are connected by conductors 31 and 32. A dipole antenna including antenna elements 13 and 14 and a dipole antenna including antenna elements 23 and 24 are connected by conductors 33 and 34. A feed phase is made different by 90°between the pair of dipole antennas connected by conductors 31 and 32 and the pair of dipole antennas connected by conductors 33 and 34, whereby the horizontal radiation pattern can be made omnidirectional. Furthermore, respective feed points (points to which feeding circuits are connected) of conductors 31 to 34 are set to positions other than middle points of the conductors, whereby the direction of the main beam in the vertical plane can be changed. COPYRIGHT: (C)2009,JPO&INPIT
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