| 摘要 |
PROBLEM TO BE SOLVED: To provide a circularly polarized antenna device in which a radiating conductor plate is miniaturized, dielectric loss is small, and performance is excellent. SOLUTION: This antenna device is provided with a ground conductor plate 1 made of a metal plate, and a radiating conductor plate 7 made of a metal plate and disposed at a predetermined gap from the conductor plate 1. In the conductor plate 1 and/or the conductor plate 7; a plurality of first extending portions 9-12 extending to the conductor plate 1 is provided in the radiating conductor plate 7, a plurality of second extending portions 14-17 extending to the conductor plate 7 is provided in the ground conductor plate 1, and a capacitor is formed between the first extending portions 9-12 and the ground conductor plate 1, between the second extending portions 14-17 and the conductor plate 7, or between the first extending portions 9-12 and the second extending portions 14-17. Thus, the resonant frequency is shortened and the conductor plate 7 is miniaturized, and the inexpensive apparatus is obtained. COPYRIGHT: (C)2005,JPO&NCIPI
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