ANTENNA DEVICE

PROBLEM TO BE SOLVED: To provide an antenna device having reduced power consumption without substantially changing a communication range. SOLUTION: The antenna device 10 includes a transmitting part 11 to which binary signals (a) and carrier waves (b) are supplied from a control part, and a transmitting antenna 5 connected to the transmitting part 11. The transmitting part 11 includes a time sharing control circuit 12 for controlling the binary signals (a) to be time-shared into first-half driving signals a1 and second-half switching signals a2, a driving circuit 4 to be controlled by the driving signals a1 and the carrier waves (b), and a switching circuit 13 to be controlled by the switching signals a2. COPYRIGHT: (C)2009,JPO&INPIT