2.45 GHz semi-active radio frequency identification label and signal processing method thereof

Abstract

The invention relates to a 2.45GHz semi-active radio-frequency identification label, which comprises a microprocessor, an ASK demodulation module, a small signal magnifying module, a two-way selection module, a load modulation module, a voltage detection circuit, a power supply module and an antenna module. The antenna module comprises a first dipole antenna and a second dipole antenna, the small signal magnifying module and the ASK demodulation module are connected to form an antenna signal receiving unit, the two-way selection module and the load modulation module are connected to form a label signal emitting unit, and a micro processing module is respectively connected with the ASK demodulation module, the two-way selection module and the voltage detection circuit; an antenna feed point (a) of the first dipole antenna is respectively connected with the load modulation module, the small signal magnifying module and the voltage detection circuit; and an antenna feed point (b) of the second dipole antenna is respectively connected with the two-way selection module and the voltage detection circuit. The semi-active label has the advantages of lower power consumption, far reading distance and strong data processing capability.

Description

technical field [0001] The invention relates to a microwave radio frequency identification (RFID) technology, specifically a 2.45GHz semi-active radio frequency identification tag and a signal processing method thereof. Background technique [0002] Radio frequency identification (RFID) technology is a technology for automatic identification through the microwave band. It has the advantages of long transmission distance and fast transmission speed. It is an ideal choice for high-speed RFID positioning and identification applications. [0003] At present, 2.45GHz radio frequency identification technology is mostly used in active active tags, and its structure is as follows: figure 1 As shown, it is mainly composed of power supply, microprocessor, sending unit, receiving unit and antenna. The power supply (usually a battery) is responsible for supplying power to the microprocessor, sending unit, and receiving unit. Active tags need power supply for radio frequency signal rece...

AI Technical Summary

Problems solved by technology

Passive tags adopt passive reception, passive data processing and backscattered radio frequency signal technology. The power consumption of the whole tag is very low, but it also results in poor data processing capability and short reading distance of received radio frequency signals.

[0005] To sum up, there is currently no tag that can take into account the three core indicators of tag performance: power consumption, reading distance, and data processing capability.

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