| 摘要 |
PROBLEM TO BE SOLVED: To provide a two-frequency resonance planar patch antenna, which can transmit and receive circularly polarized waves and linearly polarized waves, using a single antenna. SOLUTION: This patch antenna is composed of an oblong patch body 12 and a ground plate 14 where the above patch plate 12 is superposed via a dielectric, and this has on the above patch body 12, the first slot 16a and the second slot 16b which are provided in close vicinity to the opposed sides S2 and S3 of the patch body 12, and a power supply point 18 on the diagonal of a virtual square 22, which has the same center point as the patch body 12 and has sides S1', S2', S3', and S4' in parallel with the four sides S1, S2, S3, and S4 of the patch main body 12. As a result, transmission and reception of the circularly polarized waves of relatively lower frequency and linearly polarized waves of frequency higher than the frequency of the circularly polarized waves, in question with a single patch antenna 10. |
