Quick self-adaptive adjustment method for working frequency of RFID reader

A technology of self-adaptive adjustment and working frequency, which is applied in the direction of instruments, induction record carriers, electromagnetic radiation induction, etc., can solve problems such as difficult to meet the use requirements and software processing time, so as to cope with the rapid and dynamic environmental interference, save The effect of faster software processing time and response speed

Active Publication Date: 2018-11-16
HUAZHONG UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The signal processing and frequency compensation operations of this method are all implemented by software, there is software processing time, the response speed is limited, and it is difficult to meet the use requirements when encountering fast and dynamically changing environmental interference

Method used

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  • Quick self-adaptive adjustment method for working frequency of RFID reader
  • Quick self-adaptive adjustment method for working frequency of RFID reader
  • Quick self-adaptive adjustment method for working frequency of RFID reader

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Embodiment Construction

[0025] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.

[0026] figure 1 It is the overall method flow of the present invention. Before introducing this method, the working principle of the low-frequency RFID system (including the reader body, radio frequency antenna and RFID tag), the resonance principle of the series RLC radio frequency antenna circuit, the influence of environmental interference on RFID communication and the principle are briefly ...

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Abstract

The invention belongs to the technical field of wireless communication, and discloses a quick self-adaptive adjustment method for working frequency of an RFID reader. The RFID reader comprises a reader body and a radio frequency antenna. The radio frequency antenna comprises a radio frequency antenna resistor R, an inductor L and a capacitor C. The method comprises the following steps: 1) frequency output of a phase locked loop circuit; 2) working of the radio frequency antenna; 3) solving of a phase difference waveform; 4) quantization of the phase difference waveform; 5) voltage feedback regulation. According to the invention, the RFID working frequency is quickly and automatically adjusted to be the same as the resonant frequency of the radio frequency antenna according to the environmental change through the hardware feedback regulation method, and the response speed is accelerated and environmental interference changing quickly and dynamically can be handled more quickly comparedwith a software adjustment method. Therefore, self-adaptive adjustment of working frequency is realized.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and more specifically relates to a method for fast self-adaptive adjustment of an RFID working frequency. Background technique [0002] "Radio Frequency Identification Technology" is generally referred to as RFID, which is a means of communication that identifies targets and reads relevant data through radio signals. The application occasions of RFID technology are ever-changing, and the working environment has a great influence on RFID communication. Equipment, etc.) have become the main factors affecting RFID communication. Environmental interference changes the RF antenna impedance of the RFID system (including the reader body, RF antenna and RFID tag), causing the RF antenna resonant frequency to shift from the original operating frequency. Efficiency is greatly reduced, and even communication failures may result. In addition, dynamically changing environmental factors (such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10198G06K7/10316
Inventor 陶波虞苏璞周彪尹周平
Owner HUAZHONG UNIV OF SCI & TECH
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