Ultrahigh-frequency radio-frequency identification reading/writing device and method for adaptive phase shift network

Abstract

The invention provides an ultrahigh-frequency radio-frequency identification reading / writing device and method for an adaptive phase shift network. The device comprises a control module, a transmitting module for transmitting a writing tag signal, a directional coupling module, an antenna module, a phase shift network module used for generating a local oscillator signal orthogonal to a radio-frequency signal returned by a tag, a receiving module for receiving the radio-frequency signal returned by the tag and performing down-conversion on the radio-frequency signal to form a medium-frequency signal, an interface module and a power module. According to the ultrahigh-frequency radio-frequency identification reading / writing device and method for the adaptive phase shift network, the local oscillator signal of a frequency mixer is adjusted to be orthogonal to the radio-frequency signal returned by the tag through the phase shift network module, and the radio-frequency signal returned by the tag is subjected to frequency mixing to form the medium-frequency signal, so that the noise components in the output medium-frequency signal are greatly reduced, the demodulation capability and the tag reading / writing effect of the reading / writing device are effectively improved, and the reading / writing 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 of an adaptive phase-shifting network. 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...

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Problems solved by technology

[0006] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a UHF radio frequency identification reader and method of an adaptive phase-shifting network, which is used to solve the problem of the inconsistency between the signal returned by the tag and the carrier signal in the prior art. The noise component brought by orthogonality affects the effect and distance of the reader to read and write tags

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