| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive antenna device capable of receiving the radio waves from an outside keyless entry device with high sensitivity by setting the frequency of the radio wave sent from the keyless device at the same level as the frequency of the radio wave sent from an in-vehicle remote controller and receiving both radio waves via an antenna on a column switch or a wheel. SOLUTION: The frequency of the radio wave sent from a keyless entry device 4 is set at the same level as the frequency of the radio wave sent from an inside remote controller 5. Then both radio waves are received via an antenna 1A on a column switch 1 or a steering wheel 2 and inputted to a transmitting/receiving circuit 1F. The circuit 1F detects a high frequency signal and extracts the coded signal sent by the high frequency signal to input it to a microcomputer. The radio waves transmitted from the device 5 and the wheel 2 are also inputted to the microcomputer. |
