| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna device capable of reducing instability of circular polarization characteristics as much as possible even when the shape or arrangement of electrodes is shifted. <P>SOLUTION: An antenna device 10 includes: a dielectric substrate 11; an annular first electrode part 12 provided on one surface of the dielectric substrate 11 and provided with a rectangular opening 13 on the center part; and a second electrode part 14 arranged at an interval from the first electrode part 12 on the inner side of the opening 13 of the first electrode part 12. The first electrode part 12 is extended longer in a second direction T2 orthogonal to a first direction T1 than in the first direction T1. Intervals N1 and N2 between the first electrode part and the second electrode part in the first direction T1 are both larger than intervals M1 and M2 between the first electrode part and the second electrode part in the second direction T2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
