| 摘要 |
PROBLEM TO BE SOLVED: To provide an antenna device having a satisfactory radiation characteristic of a reflector formed in a planar shape in a use frequency band in which another frequency band than a design frequency is added.SOLUTION: An antenna device includes a reflector 2 formed in a planar shape for reflecting a radio wave radiated from a primary radiator 1. The reflector 2 is such that is composed of a ground conductor plate 3 on which a dielectric substance 4 is disposed, and a plurality of reflective elements 5 of conductor patterns disposed at predetermined intervals on the dielectric substance 4. A gradient in the frequency characteristic of the reflection phase of each reflective element 5 is steeper from the substantial center portion of the reflector 2 toward the end portion. Thus, a satisfactory radiation characteristic of the reflector 2 formed in a planar shape can be obtained in a use frequency band in which another frequency band than a design frequency is added. |
