RFID tag chip antenna impedance automatic tuning system and method

An RFID tag, automatic tuning technology, applied in the field of radio frequency identification, can solve the problems of poor tuning flexibility and low precision, and achieve the effect of solving poor tuning flexibility

Pending Publication Date: 2021-08-20
上海宜链物联网有限公司
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  • Abstract
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Problems solved by technology

[0004] In order to overcome the deficiencies in the above-mentioned prior art, the object of the present invention is to provide an RFID tag chip antenna impedance automatic tuning system and method, to solve the problem that the existing RFID tag chip antenna impedance tuning method has poor tuning flexibility, and there are Technical issues with low precision limitations

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  • RFID tag chip antenna impedance automatic tuning system and method
  • RFID tag chip antenna impedance automatic tuning system and method

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Embodiment Construction

[0027] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0028] figure 1 It is a system structure diagram of an RFID tag chip antenna impedance automatic tuning system of the present invention. Such as figure 1 As shown, an RFID tag chip antenna impedance automatic tuning system of the present invention includes: a rectifier 10 , a first oscillator module 20 , a second oscillator module 30 , a digital processing module 40 and an impedance tuning...

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Abstract

The invention discloses an RFID tag chip antenna impedance automatic tuning system and method, and the system comprises a rectifier which converts the radio frequency energy collected by an antenna connected between radio frequency ports RF + and RF-into a direct-current voltage, and supplies the direct-current voltage to each power utilization unit of a tag chip; a first oscillator module which outputs a first oscillation signal with different oscillation frequencies along with different DC voltages after the tag chip is powered on; a second oscillator module which outputs a stable second oscillation signal according to the direct current voltage; a digital processing module which counts the first oscillation signals by using the second oscillation signal as a clock when the tag chip is powered on, and outputs a first control signal and a second control signal according to a counting result to respectively control the states of the first oscillator module and the impedance tuning array; and an impedance tuning array which is used for changing the antenna impedance by connecting different capacitors between the radio frequency ports RF + and RF-under the control of the second control signal so as to realize the automatic tuning of the antenna impedance.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification, in particular to an RFID tag chip antenna impedance automatic tuning system and method. Background technique [0002] As a key technology of the Internet of Things, RFID technology is widely used in the field of wireless identification. Since the identification process of RFID tags is affected by distance and complex environmental factors, too long distances, dry and wet environments, bending degrees, and environmental changes will cause tag impedance matching detuning, which will affect the identification and communication functions of RFID tags. Therefore, it is necessary to carry out Impedance Tuning of RFID Tag Chip Antenna. [0003] The impedance tuning method of the existing RFID tag chip antenna is usually done by manually changing the tuning device or using the pruning method at the initial stage of RFID tag design or installation. The tuning flexibility is poor an...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/07H03H11/28H03J1/00
CPCG06K19/0723H03H11/28H03J1/0008
Inventor 张钊锋夏志茹
Owner 上海宜链物联网有限公司
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