| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a magnetic field loop antenna for solving tasks of a trade-off of installation conditions between system requirements and antenna technological requirements, capable of detecting a tag shielded by metal and concrete, preventing the beauty of a building from being spoiled, and needing no large-scale installation work. <P>SOLUTION: A series connection of a conductor (called a loop coil 16) whose whole circumferential length is 0.5 wavelength or below (50cm or below) and a capacitor 17 (10pF or below) is built in a case 18, a detection conductor 20 is formed to be a coil, the one end of the conductor 20 is connected to a core wire side of a connector 19 connected to a cable 4 (feeder), and the other end is connected to a shield wire side of the connector 19. An interval between the detection conductor 20 above and the loop coil is selected to be, e.g. 5mm. <P>COPYRIGHT: (C)2008,JPO&INPIT |
