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Ultrahigh-frequency wireless sensing tag

A wireless sensing and ultra-high frequency technology, applied in the field of radio frequency identification and wireless sensing, to achieve low power consumption, reduce energy consumption, and simple circuit structure

Active Publication Date: 2015-02-18
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the maximum communication distance between the tag and the reader is usually only about 10 meters, it can meet the needs of most applications

Method used

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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 specific embodiments and with reference to the accompanying drawings.

[0026] figure 2 A schematic structural diagram of a UHF wireless sensor tag combined with passive and semi-active working modes provided by the present invention is shown. Such as figure 2 As shown, the sensor tag includes a UHF antenna 110 and a core circuit 19 , and the core circuit 19 is connected to the antenna 110 . The core circuit includes a core chip 18 , a battery and power management chip 16 and an off-chip sensor 17 . Wherein the battery and the power management chip 16 are connected with the off-chip sensor 17 and the core chip 18, wherein the battery and the power management chip 16 are used to supply power to the off-chip sensor interface circuit 15 and the off-chip sensor 17 in the core chip; The core ...

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Abstract

The invention discloses an ultrahigh-frequency wireless sensing tag which combines the passive operating mode with the semi-active operating mode. The ultrahigh-frequency wireless sensing tag comprises a radio frequency rectifying circuit, an ASK signal demodulation circuit and a back reflection modulator circuit which can change the input impedance of an antenna, in this way, wireless receiving and transmitting of sensing data can be achieved through the tag in a passive mode, and power consumption and cost are reduced. When the passive operating mode of the tag is started, an on-chip sensor can be started for acquisition and transmission of the sensing data; when the semi-active operating mode of the tag is started, an off-chip sensor can be started for acquisition and transmission of the sensing data. According to the sensing tag, a command specified in ultrahigh-frequency RFID international standard ISO 18000-6C and EPC C1G2 is used for starting of the on-chip sensor or the off-chip sensor and controlling and uploading of the data, in this way, a special control chip does not need to be designed, and any ultrahigh-frequency reader-writers according with the international standard can be used for acquiring and uploading the sensing data.

Description

technical field [0001] The invention relates to the technical field of radio frequency identification (RFID) and wireless sensing, and relates to an ultra-high frequency wireless sensing tag combined with passive and semi-active working modes. The sensor tag is expected to be applied in cold chain logistics, warehousing and distribution of seeds and special items. Background technique [0002] Wireless sensors have the advantages of convenient installation and zero wiring costs, and have broad application prospects in the fields of environmental monitoring, medical care, agricultural planting, and equipment management. Traditional wireless sensors usually use technologies such as ZigBee, Bluetooth and wireless local area network for data transmission. In these technologies, communication nodes need to actively transmit electromagnetic waves of several milliwatts to tens of milliwatts for wireless data transmission, and need to design a highly sensitive radio frequency recei...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K19/077
Inventor 冯鹏吴南健于双铭
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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