| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a composite antenna which can have a function equivalent to a loop antenna composed of a single line, and drive many loop antennas with little components by flowing a current in a predetermined direction on the line composed in a matrix shape. <P>SOLUTION: A reader-writer system 400 is composed of the composite antenna 350 composed in the matrix shape, a transmitter 110 which performs propagation of a carrier wave for electric power to an IC tag which is not shown through the composite antenna 350, a loop coil 9 which mediates data receiving from the IC tag, a receiver 100 which performs data transfer based on a predetermined modulation and demodulation system with the IC tag through the loop coil 9, and a PC 50 which controls the receiver 100 and the transmitter 110. Moreover, the composite antenna 350 is composed of a line group 313 composed in the matrix shape, current driving circuits 310, 311, 312, and 314 which drive currents passing through respective line groups. <P>COPYRIGHT: (C)2007,JPO&INPIT |
