Semi-active label

Abstract

The invention belongs to the field of radio frequency identification and relates to a semi-active label comprising two antennas, a battery, a rectifier module, a digital processing module, a low noise amplifier, a power amplifier, a simulation part, a capacitor, and the like, wherein a radio-frequency signal sent by a reader is received by the first antenna to be used as the input of the rectifier module on the one hand and is connected to the input end of the low noise amplifier on the other hand; the capacitor is in parallel connected between the power supply end and the grounding end of the digital processing module; the output anode of the battery is connected to the power supply end of the low noise amplifier and the power amplifier and the output anode of the rectifier module is connected to the power supply end of the simulation part; and the simulation part is used for demodulating and decoding the received radio-frequency signal and coding and modulating returned data. The label can be automatically converted in active and passive states and can work with long distance and long service life.

Description

technical field [0001] The invention belongs to the field of radio frequency identification and relates to a semi-active RFID tag which can work in two states of active and passive. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology, which automatically identifies tags through radio frequency signals and can perform two-way data transmission. Different from traditional automatic identification technology, radio frequency identification technology can carry out long-distance, non-line-of-sight identification, and the identification process does not require manual operation, and the process is fast and convenient. Generally speaking, the identification distance of radio frequency identification technology can reach more than tens of meters, it can identify objects in high-speed movement, and it can identify multiple tags at the same time. At the same time, compared with traditional barcodes, RFID tags have ...

AI Technical Summary

Problems solved by technology

[0005] 1. Active tags: There is a battery inside, generally has a long reading distance, the longest reading distance is even tens of meters or even hundreds of meters, the disadvantage is that it has a battery and the life of the battery is limited, and its cost is relatively Higher, once the battery fails, the tag will lose its function, and the volume of the active tag is relatively large

Compared with active tags, passive tags have relatively low cost and wide adaptability, and the tags are small in size and light in weight, but their working distance is limited

Images