AUTOMATIC METER-READING SYSTEM AND ANTENNA DEVICE

摘要

PROBLEM TO BE SOLVED: To extend a radio wave range in which radio transmission between radio devices is possible. SOLUTION: The automatic meter reading system S1 performs radio transmission of communication data between a key station radio device 11 and a sub station radio device 21 connected to a meter reading data output device Da. It is provided with a second antenna 23a arranged so as to link by a high frequency with a first antenna 21a arranged on the sub station radio device 21, a third antenna 23c for performing radio transmission of the communication data Da with the key station radio device 11, and a line transmission line 23b connecting the second and third antennas 23a and 23c and transmitting a high frequency signal. The third antenna 23c is arranged in a structure R1 blocking radio wave propagation between the sub station radio device 21 and the surroundings.