(2) Electromagnetic backscatter coupling is generally based on the radar principle model. The electromagnetic waves emitted will reflect after hitting the target, and will carry back the target information at the same time, based on the spatial propagation law of electromagnetic waves
The inductive coupling mode of hf rfid reader is generally suitable for short-range radio frequency identification systems that work in medium and low frequencies. Typical operating frequencies are: 125kHz, 225kHz and 13.56MHz. The identification action distance is less than 1m, and the typical action distance is 10-20cra.
The hf rfid reader electromagnetic backscatter coupling method is generally suitable for long-range radio frequency identification systems that work with high frequencies and microwaves. Typical operating frequencies are: 433MHz, 915MHz, 2.45GHz, 5.8GHz. The identification action distance is greater than 1m, and the typical action distance is 3-10m.