| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an antenna capable of efficiently and widely transmitting power even at high frequency; a feeding device using the antenna; and a non-contacting power transmission system. <P>SOLUTION: An antenna is composed of a first coil 11; and a second coil 12 disposed in parallel with the first coil 11, and connected to the first coil 11 in parallel. The second coil 12 has a capacitor 13 and a resistor 14 which are inserted in series. The second coil 12 is adjusted so as to match resonance frequency with the driving frequency of the antenna according to the capacity of the capacitor 13. At the driving frequency, when an absolute value Z1 of the impedance of the first coil 11 is made to be Z1, and an absolute value of the impedance of the second coil 12 is made to be Z2, a value of the resistor 14 is adjusted so as to satisfy an expression 0.8≤Z2/Z1≤1.2. Furthermore, at the driving frequency, the phase difference of an exciting current between the first coil 11 and the second coil is adjusted to be within 45° to 90°. <P>COPYRIGHT: (C)2013,JPO&INPIT |
