Radio frequency identification reader-writer and method with ultrahigh frequency

Abstract

The invention provides a radio frequency identification reader-writer and a radio frequency identification method with ultrahigh frequency. The read-writer comprises a control module, an emission module, a directional coupling module, a radio frequency matching module, an antenna module, a vector modulation carrier wave cancellation module, a receiving module, an interface module and a power supply module; on one hand, carrier signal power leaked to a receiving link from the emission module is reduced through matching and increasing the isolation degree of a coupling module, on the other hand, the carrier signal power leaked to the receiving link is reduced through a vector modulation carrier wave cancellation technology. In the radio frequency identification reader-writer and the radio frequency identification method with ultrahigh frequency, the impedance characteristic of a coupler is changed by use of a radio frequency matching technology, the isolation degree is increased, the carrier signal power leaked to the receiving link from the emission module is reduced; the carrier signal power leaked to the receiving link is reduced through the vector modulation carrier wave cancellation technology; and through combination of the two technologies, the carrier signal power leaked to the receiving link is eliminated or reduced to sufficiently small, a tag returning signal is retained, thus the sensitivity of the reader-writer is improved and the read-write distance is increased.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to an ultra-high frequency radio frequency identification reader-writer and method. Background technique [0002] Radio Frequency Identification (RFID) is a wireless communication technology, which is a non-contact automatic identification technology that uses radio frequency signal spatial coupling to identify targets and obtain target data. The most important advantage of RFID technology is non-contact identification, and it can read labels through harsh environments such as snow, fog, ice, paint, dust and other barcodes that cannot be used, and can also identify multiple labels at the same time. It has the advantages of diversification, strong anti-pollution ability, reusability, large memory capacity of data and encryption. With the development of RFID technology, its application fields are becoming more and more extensive, such as food safety traceability, book borrow...

AI Technical Summary

Problems solved by technology

[0006] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a UHF radio frequency identification reader and method, which

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