| 摘要 |
PROBLEM TO BE SOLVED: To control directivity by a simple constitution. SOLUTION: In an antenna structure 1 disposing a dielectric substrate 2 providing a radiation electrode 3 on a rectangular substrate 4, the radiation electrode 3 is designed to perform a wireless communication with circularly polarized electric wave by providing a configuration of the radiation electrode 3 to be shrunk and separated, in which a length of any one of edges of the rectangular substrate 4 is shorter than one wave length of the electric wave of a predetermined frequency band for the wireless communication. In the rectangular substrate 4, a ground electrode 5 is formed approximately all over the substrate 4 except for a slit 10 for directivity control. The slit 10 for directivity control is a slit which is extended and formed toward a disposing area of the dielectric substrate 2 from a pair of respective edges 5A, 5B side in the substrate 4 opposing to each other. COPYRIGHT: (C)2006,JPO&NCIPI
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