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Intelligent antenna system for RFID label

A technology for smart antennas and receiving antennas, applied in the field of smart antenna systems for RFID tags, can solve problems that affect signal transmission and reception, and the antenna system cannot adapt to the electromagnetic environment, so as to improve sensitivity and environmental adaptability, and increase resistance Effects of Capabilities in Complex Electromagnetic Environments

Inactive Publication Date: 2018-05-25
BEIJING TONGFANG MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For different application scenarios, communication distances and PCD devices, the signal strength received by the antenna coil will be affected by the space electromagnetic environment, and the scene will change. An antenna system with only one direction cannot adapt to the complex electromagnetic environment, which will affect the transmission of signals and take over

Method used

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  • Intelligent antenna system for RFID label
  • Intelligent antenna system for RFID label
  • Intelligent antenna system for RFID label

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Embodiment Construction

[0022] see figure 2 , is a schematic structural diagram of the smart antenna system of the present invention. The smart antenna system includes sequentially connected receiving antennas, signal strength extraction circuits, amplification comparison circuits and switch switching circuits, wherein the smart antenna system complies with the ISO / IEC 1443 protocol, and includes sequentially connected receiving antennas, signal strength extraction circuits , Amplification and comparison circuit and switch switching circuit, wherein the receiving antenna is an antenna array whose magnetic flux forms a certain angle (the angle is equal to 180 degrees / N, N≥2), each receiving antenna includes an inductor and a capacitor, and the inductor and capacitor form a resonance The LC receiving circuit with a frequency of 13.56MHz, the LC receiving circuit receives the modulation signal from the reader, and generates the input signal Vin1−VinN of the signal strength extraction circuit, Vin1-VinN...

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Abstract

The invention provides an intelligent antenna system for an RFID label. The intelligent antenna system comprises reception antennas, a signal intensity extraction circuit, an amplification comparisoncircuit and a switch switching circuit which are sequentially connected, wherein the reception antennas are an antenna array of which magnetic fluxes are mutually in certain included angles (the included angle is equal to 180 DEG / N, and the N is not smaller than 2), each reception antenna comprises an inductor and a capacitor, the inductor and the capacitor form an LC reception circuit having theresonant frequency of 13.56MHz, the LC reception circuit is used for receiving modulation signals from a reader writer and generating input signals Vin1-VinN of the signal intensity extraction circuit, and the Vin1-VinN are modulation signals of carrier waves in 13.56MHz. The intelligent antenna system is advantaged in that a new design concept is employed, one signal path of the antenna array ofwhich the magnetic fluxes are mutually in the certain included angles is selected through weighted comparison (the included angle is equal to 180 DEG / N, and the N is not smaller than 2), complex electromagnetic environment resistance capacity of the label is enhanced, and sensitivity and environmental adaptability of a label demodulation circuit are effectively improved.

Description

technical field [0001] The invention relates to a tag conforming to ISO / IEC 1443 standard protocol, in particular to a smart antenna system for RFID tags. Background technique [0002] RFID (radio frequency identification, radio frequency identification) communication system includes a reader (reader) and a number of tags (tag). ISO / IEC 1443 is a standard protocol for near-field RFID systems. The carrier frequency of this standard is 13.56MHz, and the communication distance is usually between 0-10cm. It involves PCD (proximity coupling device, equivalent to a reader) and PICC ( Two-way communication between adjacent cards, equivalent to tags). TYPEA and TYPEB card types are defined according to the different ways of signal transmission and reception. Their differences mainly lie in the modulation depth of the carrier wave and the encoding method of binary numbers. [0003] TYPE-A adopts improved Miller encoding method and 100% ASK modulation when PCD transmits signals to P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10297
Inventor 毋磊韩书光李雪建张云翔范明浩王强
Owner BEIJING TONGFANG MICROELECTRONICS