UHF-band RFID narrowband notch mask

An RFID tag and wave notch technology, applied in the directions of antenna supports/installation devices, electrical components, antenna parts, etc., can solve the problems of RFID tag reading distance and reading/writing success rate decrease, radio interference, etc.

Inactive Publication Date: 2017-11-10
BEIJING UNIV OF POSTS & TELECOMM
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

There are serious radio interference problems when broadband RFID tags are deployed in application systems. For example, the GSM frequency band and FM stereo frequency band in China overlap with the RFID frequency band. The RFID system in this environment will be significantly interfered by external wireless signals. As a result, the RFID tag reading distance and read / write success rate are significantly reduced

Method used

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  • UHF-band RFID narrowband notch mask
  • UHF-band RFID narrowband notch mask
  • UHF-band RFID narrowband notch mask

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Embodiment Construction

[0017] The present invention will be described in detail below by means of the accompanying drawings and specific embodiments.

[0018] Such as figure 1 and figure 2 As shown, the RFID narrowband notch mask proposed in the present invention is composed of a flexible dielectric base material 102 and a pair of symmetrically distributed split rings 101 printed thereon. Dielectric base material 102 is polyethylene terephthalate (PET) material, and its dielectric coefficient is 3.9, and loss tangent is 0.003, and its length is 1 / 2 wavelength, and width is 1 / 6 wavelength, and thickness 0.3mm. The material of the symmetrical rectangular split ring 101 is copper, its thickness is 0.17 mm, and its physical dimension parameters are set as follows: the long side is one-fifth of the wavelength, the wide side is one-twentieth of the wavelength, and the length of the opening is one-tenth wavelength, the linewidth is 1 mm, and the distance between the centers of the two split rings is a ...

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Abstract

The invention discloses a UHF-band RFID narrowband notch mask. The narrowband notch mask is a flexible medium substrate material and a pair of rectangular gap rings printed on the flexible medium substrate material. The rectangular gap rings are distributed symmetrically. The resonant frequency of the rectangular gap rings is within an RFID passband. The narrowband notch mask is adhered on the surface of a UHF-band RFID tag. When the rectangular gap rings on the mask carries out resonance, a current direction on the rectangular gap rings is opposite to that on the UHF-band RFID tag, so electromagnetic fields generated by the rectangular gap rings and the UHF-band RFID tag are cancelled, narrowband notch is formed on a commercial broadband RFID tag, the commercial broadband RFID tag becomes a narrowband tag, and the radio interference rejection of an RFID system is greatly improved. The notch frequency and notch bandwidth can be adjusted by changing sizes and shapes of the rectangular gap rings, so the UHF-band RFID narrowband notch mask is applicable to RFID applications of different frequency bands stated by different countries and regions.

Description

technical field [0001] The invention relates to a radio frequency notch structure, in particular to a UHF frequency band RFID narrow-band notch mask. Background technique [0002] Radio frequency identification (RFID) technology is an advanced wireless automatic identification technology, especially the RFID technology in the UHF frequency band (860MHz ~ 960MHz), because of its significant advantages such as radio wave penetration, high-speed transmission, and multi-label anti-collision, it has been used in personnel Management, access control management, asset management, logistics transportation, trajectory tracking and other fields have been widely used. [0003] Due to the different allocation of spectrum resources in different countries and regions, the frequency bands allocated to RFID in each country are also different. In order to meet the application needs of different countries and regions, the design and manufacture of RFID tags often use the same standards as the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q15/00H01Q1/22
CPCH01Q1/2225H01Q15/0053
Inventor 洪卫军陈德肯董雅儒
Owner BEIJING UNIV OF POSTS & TELECOMM
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