A UHF wireless sensor tag

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

Active Publication Date: 2018-03-06
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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  • A UHF wireless sensor tag
  • A UHF wireless sensor tag
  • A UHF wireless sensor tag

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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. like 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 chi...

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Abstract

The invention discloses an ultra-high frequency wireless sensor tag combined with passive and semi-active working modes. The sensor tag includes a radio frequency rectification circuit, an ASK signal demodulation circuit and a back-firing modulation circuit that can change the input impedance of the antenna, so that the tag can realize the wireless transmission and reception of sensing data in a passive manner, thereby reducing power consumption and cost. When the tag starts the passive working mode, it can start the on-chip sensor and collect and transmit the sensing data; when the tag starts the semi-active working mode, it can start the off-chip sensor and collect and transmit the sensing data. The sensor tag uses the instructions specified in the UHF RFID international standard ISO18000-6C and EPC C1G2 to complete the start-up, control and data upload of the on-chip sensor or off-chip sensor, so there is no need to design a dedicated control chip, and any The above-mentioned international standard UHF reader is used to collect and upload 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 Patents(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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