| 摘要 |
A direct conversion type RFID(Radio Frequency IDentification) system is provided to surely check whether a corresponding frequency band is used or not by generating a signal which is easy to perform power determination. A direct conversion type RFID system includes a phase locked loop part(190), an RFID receiving processor(120), an RFID transmitting processor(140), a signal coupling part(170) and a signal level detector(180). The phase locked loop part generates a standard frequency signal, and the RFID receiving processor processes an RFID receiving signal by using the standard frequency signal. The RFID transmitting processor processes an RFID transmitting signal by using the standard frequency signal. The signal coupling part is connected to an input port of the RFID receiving processor and couples receiving signals in a predetermined band. The signal level detector converts the coupled signals by using the standard frequency signal and checks a power level of the converted signal. |
