Ultrahigh-frequency RFID (radio frequency identification device) reading and writing module based on self-adaptive tuning technology of antenna

Abstract

The invention relates to an RFID (radio frequency identification device) reading and writing module, and particularly relates to an ultrahigh-frequency RFID reading and writing module based on a self-adaptive tuning technology of an antenna. The ultrahigh-frequency RFID reading and writing module comprises a central processor, a self-adaptive impedance tuning network, a power management circuit, a connector, a radio frequency connector, a crystal oscillator I and a crystal oscillator II, wherein the crystal oscillator I and the connector are connected with the central processor; the central processor is connected with the self-adaptive impedance tuning network; the self-adaptive impedance tuning network is connected with the radio frequency connector; the power management circuit is connected with the connector, the central processor, the crystal oscillator II and the self-adaptive impedance tuning network; and the radio frequency connector is connected with an external antenna. The ultrahigh-frequency RFID reading and writing module has the beneficial effects of solving the problem that a reflected wave of the antenna is deteriorated because of external factors so as to cause degeneration of receiving sensitivity, having stable radio frequency characteristics when the cost is reduced, and being stronger in multi-label processing capacity, higher in counting efficiency and more suitable for application of a handheld reader-writer.

Description

technical field [0001] The invention relates to an RFID read-write module, in particular to an ultra-high frequency RFID read-write module based on antenna self-adaptive tuning technology. Background technique UHF RFID read-write module is the core component of the hardware of the overall RFID solution, usually consisting of a transmitter, receiver, circulator (or coupler), detector, and CPU. Since the UHF RFID reader is a device that transmits and receives at the same frequency and at the same time, unlike the TDD and FDD modes of the RF front-end of mobile communication phones, the RFID read-write device is a self-interference system: in addition to the transmission power and sensitivity of the hardware itself In addition to the indicators, the size of the transmitted power reflection wave caused by the standing wave at the antenna end also directly affects the distance of the read and write distance, and the stronger the interference signal energy entering the receiver,...

AI Technical Summary

Problems solved by technology

In order to overcome the above disadvantages, the present invention aims to provide a method capable of overcoming the disadvantages of poor anti-antenna mismatch capability of the radio frequency architecture of the traditional UHF RFID read-writ

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