| 摘要 |
<P>PROBLEM TO BE SOLVED: To develop an antenna with low directivity, and to provide a reception antenna having a receivable direction of about 360 degrees on the same plane as a single antenna. <P>SOLUTION: A reception antenna of resonance type closed magnetic circuit includes an annular core consisting of a magnetic material, a coil wound around the core at least partially, and a capacitor connected in parallel with the coil, wherein the ratio Dx/Dy of the core width Dx of the coil in the axial direction and the core width Dy in the vertical direction is in the range of 0.5-2. <P>COPYRIGHT: (C)2009,JPO&INPIT |
