Small shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna

A technology of RFID tags and tag antennas, applied in the direction of antenna support/installation device, radiation element structure, etc., to achieve the effect of good performance and total volume reduction

Inactive Publication Date: 2013-07-31
BEIJING UNIV OF POSTS & TELECOMM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention provides a method to solve the problem of further miniaturization of the tag antenna, and is especially suitable for application in fields requiring tag antenna miniaturization, omnidirectionality and special requirements for tag shape

Method used

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  • Small shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna
  • Small shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna
  • Small shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna

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Embodiment Construction

[0030] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0031] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0032] Such as figure 1 , 2 Shown is a schematic structural diagram of a preferred embodiment in the form of a rectangular loop of a small, adjustable shape double-loop UHF RFID tag antenna of the present invention. This embodiment includes a rectangular substrate 3 (ε r =4.4,μ r =1), RFID tag chip 4 (Monza4 chip is used in this embodiment, the impedance is 11-j143Ω when the operating frequency is 915MHz), inner ring 1, outer ring 2 with an inverted Z-shaped notch, by adjusting the substrate 3 The dielectric constant and thickness, the inner ring 1, the outer ring 2 and the size of the gap can change the input impedance and operating frequency of the tag ...

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Abstract

The invention discloses a shape-adjustable double ring-shaped ultrahigh frequency RFID (Radio Frequency Identification) tag antenna, which belongs to the technical field of radio frequency identification. In the tag antenna, two conductor rings are produced on one side of a basal plate and are taken as an antenna structure, wherein an inner ring is a closed conductor ring connected with a chip, an outer ring is one conductor ring provided with an inverse Z-shaped notch, the rings can be in the shape of a round or a rectangle or in other shapes, and the performance is little changed. The tag antenna can be applied to frequency ranges such as UHF (Ultra High Frequency) or ultrashort waves and the like; the size is only 32*32*0.8mm<3> (0.1*0.1*0.002Lambada<3>) if the structure of the shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna is adopted by taking the condition that center frequency is 915MHz and the chip adopts Monza4 as an example, so that very high efficiency, omni-directionality and wide applicability can be achieved, and the shape-adjustable double ring-shaped ultrahigh frequency RFID tag antenna can be applied to other chips and operating frequencies after being adjusted simply. The invention provides a method which solves the further miniaturization problem of the tag antenna, wherein the method is especially suitable for being applied to the field of needing miniaturization and omni-directionality of the tag antenna and having special requirements on the shape of a tag.

Description

technical field [0001] The invention relates to a radio frequency identification electronic tag, especially a miniaturized, omnidirectional, and adjustable-shaped electronic tag. Background technique [0002] Radio Frequency Identification (RFID) technology is a technology that conducts non-contact two-way data communication through radio frequency to identify targets. An RFID system usually consists of a reader and an electronic tag. The electronic tag is composed of a tag chip and a tag antenna. It exchanges data with the reader through electromagnetic waves, and has functions such as intelligent reading and writing and encrypted communication. The tag antenna is a vital part of the RFID system. The RFID system transmits and receives electromagnetic waves through the tag antenna, thereby realizing the identification of the electronic tag by the reader. [0003] RFID systems mainly work in low frequency, high frequency, ultra high frequency and microwave frequency bands. ...

Claims

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Application Information

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IPC IPC(8): H01Q1/36H01Q1/22
Inventor 李莉王霖川
Owner BEIJING UNIV OF POSTS & TELECOMM
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