An active radio frequency identification system
A radio frequency identification system and radio frequency receiving technology, applied in the field of active radio frequency identification systems, can solve problems such as channel load, heavy signal load, and affecting multi-label reading, etc., to achieve efficient and seamless reading and resolution The effect of signal conflict and avoiding wireless signal interference
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[0013] The active radio frequency identification system of the embodiment of the present invention includes a card reader and an electronic tag, and the tag circuit adopts a known circuit structure, and its working method is as follows:
[0014] 1. After the tag is powered on, set the basic circuit parameters and a wake-up time of 1 second, and then sleep;
[0015] 2. After the tag sleeps and wakes up, a random delay is performed. The delay time is from 0 to 10ms. After the delay, the data is sent once on 2.440GHz. After the transmission is completed, it sleeps and waits for a regular wake-up;
[0016] 3. After the next wake-up, send data on the 2.450GHz frequency, and so on.
[0017] The main parts of the implementation structure of the card reader are as follows: figure 1 As shown, the antenna is connected with the digital adjustable attenuator HMC274, and the digital adjustable attenuator HMC274 is controlled by the microcontroller LPC1754. The RF output pin of the digita...
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