Environment adaptive low-frequency RFID reader and resonance parameter adjusting method thereof

A resonant parameter and reader technology, applied in the field of radio frequency, can solve the problems of destroying the resonant parameter, affecting the inductance and AC impedance of the antenna, affecting the reading effect and normal use of the reader, and achieving the effect of reducing the impact and avoiding the impact.

Pending Publication Date: 2018-08-17
WUXI FOFIA TECH
View PDF0 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Under normal circumstances, the matching of inductance L1, capacitor C1 and resistance R1 has been adjusted to the optimal parameters when the low-frequency RFID reader is on the market. In the use of short-range low-frequency RFID readers, even slight changes in the user's environment will have little impact. Users can basically ignore this effect; but in the use of large-scale long-distance low-frequency RFID readers, environmental changes are often unexpected, such as metal railings, ferromagnetic media, etc. around

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Environment adaptive low-frequency RFID reader and resonance parameter adjusting method thereof
  • Environment adaptive low-frequency RFID reader and resonance parameter adjusting method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0029] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0030] This application discloses a low-frequency RFID (Radio Frequency Identification, radio frequency identification) reader that is adaptive to the environment. The low-frequency RFID reader adjusts the circuit structure of the traditional low-frequency RFID reader to adjust the resonance parameters of the adaptive environment. Function. Please refer to figure 2 The circuit diagram of the low frequency RFID reader in this application is shown, the low frequency RFID reader includes: drive source V1, fixed resistor R1, fixed antenna L1, fixed capacitor C1, first impedance adjustment resistor RJ1, second impedance adjustment resistor RJ2 , n resonant adjustment capacitors CJ1-CJn, micro control unit MCU and n+2 electronic switch circuits ER1, ER2, EC1-ECn, n is a positive integer, usually set n=8, then the adjustment of the low-frequency ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an environment adaptive low-frequency RFID reader and a resonance parameter adjusting method thereof, and relates to the field of radio technologies. An impedance adjusting resistor and a resonance adjusting capacitor are added to a traditional circuit structure of a low-frequency RFID reader, a phase-locked loop driving source and an electronic switching circuit are switched automatically to match the capacitor and the resistor, and each time the reader is powered on, an internal MCU detects and adjusts the resonance parameter automatically. Thus, an antenna works in the optimal state, influence of environment on the low-frequency RFID reader is reduced, the environment is adapted to, and normal use of the low-frequency RFID reader is not influenced due to high switching speed of the electronic switching circuit.

Description

technical field [0001] The invention relates to the field of radio frequency technology, in particular to an environment-adaptive low-frequency RFID reader and a resonance parameter adjustment method thereof. Background technique [0002] Low-frequency RFID (Radio Frequency Identification, radio frequency identification) readers are widely used in daily life, such as access control, management of animals and plants, and the like. Please refer to figure 1 In the circuit diagram shown, the basic structure of the low-frequency RFID reader is a series resonant circuit composed of inductor L1, capacitor C1 and resistor R1. The inductor L1 is the antenna. The antenna L1 is both a transmitting antenna and a receiving antenna. Supply power to the low-frequency tags in the magnetic field, and also achieve the purpose of communication by analyzing the changes of the coupled magnetic field. [0003] Under normal circumstances, the matching of inductance L1, capacitor C1 and resistanc...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G06K7/10
CPCG06K7/10198
Inventor 罗远明
Owner WUXI FOFIA TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap