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Near-field radio frequency identification antenna with large-size electric identification area

A near-field radio frequency identification and identification area technology, which is applied to antennas, loop antennas, antenna components, etc., can solve the problem of misreading labels outside the identification area, and achieve the effects of avoiding misreading, increasing the identification distance, and reducing the magnetic field.

Active Publication Date: 2018-11-13
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the existing near-field antenna UHF-RFID antenna based on magnetic field coupling technology can realize an electrically large-sized identification area, but there is a problem of misreading tags outside the identification area.

Method used

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  • Near-field radio frequency identification antenna with large-size electric identification area
  • Near-field radio frequency identification antenna with large-size electric identification area
  • Near-field radio frequency identification antenna with large-size electric identification area

Examples

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Embodiment

[0025] Such as figure 1 As shown, a near-field radio frequency identification antenna with an electrically large-sized identification area uses an FR4 plate with a dielectric constant of 4.4, a loss tangent of 0.02, and a thickness of 0.8 mm. The antenna as a whole consists of two ring structures: an outer ring structure and an inner parasitic coupling ring structure. Both ring structures are composed of transmission lines and multiple "interdigitated structures". The bottom end of the outer ring is the feeder part, which is bent towards the central area. The double-sided meandering microstrip line feed structure is adopted. After simulation optimization, the specific structure and size of the antenna are as follows: figure 1 shown. The outer loop structure is that the loop antenna 10 is arranged on the periphery, and the coupling loop structure is that the coupling loop antenna 20 is arranged inside the outer loop antenna. The loop antenna 10 and the coupling loop antenna...

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PUM

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Abstract

The invention discloses a near-field radio frequency identification antenna with a large-size electric identification area. The antenna structurally comprises a first loop antenna arranged on the periphery and a coupled loop antenna arranged in the first loop antenna, wherein each of the first loop antenna and the coupled loop antenna comprises a plurality of interdigital structures; the interdigital structures are connected through a transmission line; the middle of the bottom end of the first loop antenna is bent towards the side of the coupled loop antenna; and a feed port is arranged at the bottom end of the first loop antenna. According to the near-field radio frequency identification antenna, on one hand, the large-size electric identification area is ensured and the identification distance is increased, and on the other hand, a magnetic field outside the identification area is reduced and misreading of a label is avoided under the condition of ensuring near-field magnetic fieldintensity and uniformity.

Description

technical field [0001] The invention relates to the technical field of ultra-high frequency near-field radio frequency identification antennas, in particular to a near-field radio frequency identification antenna with an electrically large-sized identification area. Background technique [0002] Radio Frequency Identification (RFID) is a non-contact automatic identification technology, mainly composed of readers, tags and reader antennas. The reader sends out a radio frequency signal, and using the space coupling method, the current generated by the tag induction will stimulate the chip in the tag to work, and finally the reader will recognize the radio frequency signal sent from the tag, thereby realizing the reading and writing of the information in the tag. In the near-field RFID system, the coupling method between the reader antenna and the tag can be divided into magnetic field coupling and electric field coupling. If the electric field coupling method is used, the ind...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01Q7/00H01Q1/36H01Q1/50H01Q1/22
CPCH01Q1/2216H01Q1/36H01Q1/50H01Q7/00
Inventor 刘学观吕洪辉
Owner SUZHOU UNIV