1) Frequency of RFID device
The RF tag works on a certain frequency. Taking our system model into account, we choose ultra high frequency (UHF) or microwave tag for mobile object identification. Usually, as microwave RF tag, the effective distance for recognizing information can reach 3–5 m.
(2) Power control
Both RFID reader and the light control circuit need power supply modules. As the system is mainly installed in the city, the power supply is provided with chargers.