| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a high-sensitivity magnetic antenna which can be coupled strongly to magnetic flux, in a direction perpendicular to a surface of a magnetic core and is enhanced in the radiation efficiency of the magnetic flux, and to provide an antenna device. <P>SOLUTION: The magnetic flux which enters from a coil conductor opening CW through to the side of the magnetic core 22 contributes to coupling with a communication partner side antenna. Meanwhile, a magnetic flux MFA, which enters from other than the coil conductor opening CW to escape to the side of the magnetic core 22 does not contribute to coupling. The magnetic core 22 does not cover a second coil conductor part A2, which is a position through which the magnetic flux which does not contribute to the coupling passes. Thus, self-inductance by the second coil conductor part A2 is reduced, and the degree of coupling is improved. In addition, loss in the second coil conductor part A2 which does not contribute to the coupling is reduced, and the communication performance is improved. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
