| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress the occurrence of a standing wave by performing an impedance matching of a loop antenna and transmission lines. <P>SOLUTION: A resistor 41 is connected to the transmission lines L1 and L2 of a reader/writer 31 in parallel with the loop antenna 11. A resistance value of the resistor 41 is a value at which the impedance of the loop antenna 11 is equal to the characteristic impedance of the transmission lines L1 and L2. As a result, it is possible to suppress the occurrence of a standing wave on the loop antenna 11. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
