| 摘要 |
<p>In order to reduce the size, weight, and cost of an interrogator which should have a high output of the RFID system, an electric wave source of the interrogator for transmitting a signal or a power source of the interrogator shares the electric wave source or the power source of a cellular radio terminal such as a cellular telephone and a cellular communication device. For this, amplitude of a radio frequency transmission signal of the cellular radio terminal is modulated by the information transmitted to a transponder. Furthermore, a part of the radio frequency transmission signal extracted by using a coupler is used to synchronously detect the radio frequency reception signal transmitted from the transponder and extract data from the transponder.</p> |
