Compensation process of ultra-high frequency RFID label reading device, reading device and radio frequency front end thereof

Abstract

The invention discloses a leakage compensation method for UHF RF electron tag reader and an RF front end of the UHF RF electron tag reader which is used to achieve the compensation method, which is belonged to the field of wireless RF technology. The core of the invention is as following: using two ring isolation or coupler, through controlling device layout and PCB-board alignment, obtaining thesame signal delay two signals, one single is useful signal stacked leakage signal, the other single is compensation signal which has the same size and amplitude with leakage signal, the two signal pathway through the low noise amplifier to do cut operation, then the leakage signal can be got rid of, thus obtaining clean useful signal in the front-end of RF, and enhancing sensitivity of the UHF RFelectron tag reader, And greatly reduce design difficulty of each circuit module of traditional reader structure, more easy to implement system monolithic integration of RF electron tag reader system.

Description

technical field [0001] The present invention relates to a method for compensating leakage of a link in the field of radio frequency technology, in particular to a method for compensating for leakage of an ultra-high frequency radio frequency electronic tag reader (UHF RFID Reader, Ultra High Frequency Ratio-Frequency Identification), and provides a The radio frequency front end of the ultra-high frequency radio frequency electronic tag reader realizing the above compensation method. Background technique [0002] In recent years, radio frequency tag identification technology (RFID, Ratio-Frequency Identification) has attracted much attention at home and abroad because of its huge potential in logistics and supply chain management. The RFID coding technology enables any item in the world to have its own "identity number". RFID can automatically read the "identity number" of the item and process its related information, and establish an "item network" through the network, " Th...

AI Technical Summary

Problems solved by technology

There are two problems with such a solution: First, if the sensitivity of the reader is to be further improved, it means that a higher resolution ADC is required; Second, the linearity of the mixer and the low-noise amplifier in the design of the RF front-end of the reader is very important. high demands

The problem with this solution is that there are still very high requirements on the linearity of the mixer and LNA, which is not conducive to the realization of low-cost all-CMOS chips

Images